Aims

The present study seeks to investigate the correlation of pubofemoral distances (PFD) to α angles, and hip displaceability status, defined as femoral head coverage (FHC) or FHC during manual provocation of the newborn hip < 50%.

Arthrodesis of the first metatarsophalangeal joint (MTPJ) is the most reliable surgical option, for hallux rigidus from end-stage osteoarthritis. The aim of the study was to compare the functional outcomes of memory nickel-titanium staples versus a compression plate with a cross screw construct for first MTPJ arthrodesis using the Manchester–Oxford Foot Questionnaire (MOXFQ). Patients who underwent MTPJ arthrodesis using either memory nickel-titanium staples or a compression plate with a cross screw construct were identified from the surgical lists of two orthopaedic consultants. Pre and post-operative MOXFQ questionnaire, a validated patient-reported outcome measure, was administered, and responses were analysed to derive the MOXFQ summary index. The study included 38 patients (staple group N=12 and plate and cross screw group N=26). 23 patients were female and 15 were male. Mean age was 64.8 years (SD 9.02; 40 to 82). Initial analysis showed no significant difference in preoperative MOXFQ scores between the groups (p = 0.04). Postoperatively, the staple group exhibited a mean improvement of 36.17, surpassing the plate group's mean improvement of 23. Paired t-test analysis revealed a statistically significant difference (t-score= 2.5, p = 0.008), favouring the use of staples. The findings indicate that the use of staples in MTPJ arthrodesis resulted in a significantly greater improvement in MOXFQ scores compared to plates. Further research is needed to explore the underlying factors contributing to this difference and to evaluate long-term effects on patient outcomes

Purpose of Study and Background. Degenerative cervical myelopathy resulting in cord compromise is a progressive condition that results in significant quality of life limitations. Surgical treatment options available are anterior and/or posterior decompression of the affected levels. Patients are counselled pre-operatively that the aim of surgical intervention is to help prevent deterioration of neurology. Anecdotal evidence suggested improvements in both EMS and PROMs in this cohort of patients. A 2-year prospective study tested this hypothesis. Methodology and Results. 67 patients undergoing anterior cervical surgery were followed up to two years. Myelopathic features, radiological cord compression, myelomalacia change and levels of surgery were recorded. Pre/post intervention myelopathy scores/grades, and PROM's were recorded. Paired t-test was performed when comparing pre/post intervention scores and Annova test when comparing results across levels. Our prospective study identified statistically significant improvements in European myelopathy scores and grade and patient reported clinical outcomes in the said population. Conclusions. DCSM patients undergoing anterior surgery demonstrated statistically significant improvement in PROMs and EMS scores and grades. This has been demonstrated irrespective of number of surgical levels. Conflicts of Interest: None. Sources of Funding: None. Previously presented as a poster at Cervical Spine Research Society, Paris 2020-Virtual Meeting

In total hip arthroplasty (THA), cementless cup without screw holes has the putative benefits of maximizing host bone contact and reducing osteolysis by eliminating channels to backside wear particles. However, supplemental trans-acetabular screws cannot be used. 74 hips in 60 patients receiving same model of cementless cup without screw holes (Depuy Duraloc 100 HA cup) from 6/1999 to 3/2003 were prospectively followed up. All patients were allowed to have immediate full weight bearing. Age at THA was 53 ± 13 (range 24–74) years. Osteonecrosis was the leading hip disease (45% of hips). Survivorship was assessed using revision of the cup as the end point. Radiological parameters, including lateral opening angle, vertical and horizontal migration distances of the cups were measured. Paired t-test was used to compare between the measurements in early postoperative period and at final follow up. 51 hips were assessed at minimum 20 years follow-up. The mean follow-up was 22.6 (range 21 – 25) years. All the cups were well fixed. There were two cup revisions. Conventional polyethylene (PE) was used in both hips; osteolysis occurred 17 and 18 years later. Both cups were well fixed but were revised, one due to cup mal-positioning, one due to need in upsizing the articulation. 14 other hips were revised but these cups were well fixed and not revised; 9 loosened stems (most were cemented Elite plus stems), 5 PE wear and osteolysis (all were conventional PE). At 20 years, the survivorship of cups was 96.1%. Changes in lateral opening angle, vertical and horizontal migration distances were 0.44±1.59°, 0.01±1.52mm and -0.32±1.47mm respectively, without statistical significance. This study provided evidence of excellent long-term survivorship of cementless cup without screw holes. Immediate postoperative weight-bearing also did not lead to cup migration in the long-term

Background and purposes. Central Sensitization (CS) may occur in patients with Chronic Low Back Pain (CLBP). Functional capacity these patients is limited. However, the association of CLBP with functioning assessed via lifting and aerobic capacity tests has been moderately explained and results are contradictory. Let alone pain response following strenuous exercise. Finally, whether CS is associated with either or both lifting and aerobic capacities is unknown. To analyze the relationship between CS, and lifting and aerobic capacities in patients with CLBP. To describe pain response to strenuous exercise in patients with CLBP. Methods. Cross-sectional observational study. CS, lifting and aerobic capacities, and pain response were respectively measured with Central Sensitization Inventory (CSI), floor-to-waist lifting test, Cardiopulmonary Exercise Test (CPET), and Pain response questionnaire. Statistical analyses:. Stepwise-forward multiple regression with lifting and aerobic capacities (dependent), CSI (independent), physical, work- and disability-related characteristics (covariates);. Paired t-test of pain response before CPET pain to immediately and 24h after, and correlation of the changes with CSI. Results and Conclusion. 43 patients were measured. Higher CSI was associated with lower lifting (r=−0.16) and aerobic capacity (r=−0.06) performance after controlling for confounders. Explained variance were 64% and 42% respectively. Immediate pain response slightly decreased in the low back in response to strenuous exercise whereas it significantly increased in the upper legs; diffuse noxious inhibitory control could possibly explain such change. 24-hr pain response revealed no significant differences. CSI was found to be negatively associated with low back immediate pain response (r=−0.13) change. No conflicts of interest. No funding obtained

This study of collegiate basketball players evaluated change over time (COT) in ultrasound shear wave (SW) elastography metrics across the basketball season, and correlated to morphologic changes on conventional ultrasound imaging, and VISA-P scores. In eleven male collegiate basketball players (mean age 19, age range 18–21), patella tendon (PT) ultrasound and SW elastography of both knees were performed at pre-season and post-season time points, and players reported their VISA-P scores throughout the season. Patella tendinopathy grade and SW metrics were correlated to VISA-P scores using Spearman correlation coefficients. Paired t-test was used to assess differences in mean SW metrics at pre-and post-season timepoints, accounting for leg dominance. 6 of 11 players (54.5%) had baseline patella tendinopathy on ultrasound progressing in 4 players. The mean change in VISA-P score was 15.18 (+/−8.55). No significant correlation was seen between ultrasound grades of tendinopathy and VISA-P. Pre-season SW velocities did not significantly correlate with baseline VISA-P scores. Post-season SW values and SW COT demonstrated strong correlation with change in VISA-P score in dominant and non-dominant knees. Although not statistically significant, there was a trend towards higher SW velocity for tendinopathy in both dominant and non-dominant knees at both study visits. SW metrics of the PT correlated to change in VISA-P scores in the dominant and non-dominant knees, whereas conventional ultrasound grades of patella tendinopathy did not. There was a trend towards higher SW velocities in patella tendinopathy which may indicate detection of change in intrinsic tissue stiffness

Introduction. The trapezio-metacarpal joint (TMCJ) is subject to constant multiplanar forces and is stabilised by the bony anatomy and ligamentous structures. Ligament reconstruction can correct the hypermobility and potentially prevent osteoarthritis. Eaton and Littler proposed a surgical technique to reconstruct the volar ligamentous support of this joint. In our cadaveric biomechanical study, we aimed to evaluate the resultant effect of this technique on the mobility of the thumb metacarpal. Materials and method. Seventeen cadaveric hands were prepared and placed on a custom-made jig. Movements at the trapeziometacarpal joint were created using weights. Static digital photographs were taken with intact anterior oblique (AOL) and ulnar collateral ligaments(UCL) and compared with those taken after sectioning these ligaments and following Eaton-Littler reconstructive technique. The photographic records were analyzed using Scion. Image™. Paired T-test was used to establish statistical significance with a p<0.05. Results. AOL and UCL stabilised the TMCJ in extension. Division of these ligaments produced a significant degree of subluxation of the metacarpal at this joint with the thumb in a neutral position. Reconstruction of the ligamentous supports, using the Eaton-Littler technique, reduced the degree of extension. Conclusion. The primary stabilising ligament of the TMCJ is a subject of debate. Our study objectively evaluates the effect of reconstruction of AOL and UCL on various movements at the TMCJ comparing with sectioned and unsectioned specimens. It confirms the role AOL and UCL in resisting extension and utility of the Eaton-Littler procedure in decreasing hyperextension at this joint. This may have clinical utility in traumatic injury and degenerative laxity, by reducing pain and potentially slowing or even preventing the progression of osteoarthritis

Background. Non-invasive hemoglobin measurement was introduced to potentially eliminate blood draws postoperatively. We compared the accuracy and effectiveness of a non-invasive hemoglobin measurement system with a traditional blood draw in patients undergoing total joint arthroplasty. Methods. After IRB approval, 100 consecutive patients undergoing primary total hip or knee arthroplasty had their hemoglobin level tested by both traditional blood draw and a non-invasive hemoglobin monitoring system. Results were analyzed for the entire group, further stratifying patients based on gender, race, surgery (THA versus TKA), and post-operative hemoglobin level. Finally, we compared financial implications and patient satisfaction with the device. Paired t-test with 0.05 conferring significance was used. Stratified analyses of the absolute difference between the two measures were assessed using Mann- Whitney test. To assess the level of agreement between the two measures, the concordance correlation coefficient (CCC) was calculated. Results. Mean blood-draw hemoglobin value on POD1 was 11.063 ± 1.39 g/dL and 11.192 ± 1.333 g/dL with the non-invasive device. For all patients, the mean absolute difference between the two methods was 0.13 g/dL (p = 0.30). The CCC between the two methods was 0.58, conferring a moderate to strongly positive linear relationship (Figure 1). Non-invasive measurement was preferred by 100% of patients with a mean VAS score of 0/10. Additionally, the cost savings with the non-invasive system was $16.50 per patient. Discussion. Overall, there was no significant difference between the hemoglobin level obtained by traditional laboratory methods versus the Masimo Radical-7 system on post-operative day #1 in patients who underwent total joint arthroplasty. In the minority of patients (19%) who had a hemoglobin level of less than 10 g/dL, the difference between the two methods was statistically significant. Additionally, 100% of patients preferred the Masimo device to a traditional blood draw and the Masimo device was substantially cheaper. While further investigation of non-invasive hemoglobin monitoring systems is necessary, particularly in patients with a post-operative hemoglobin of less than 10 g/dL, our study shows that the Masimo Radical-7 device provides an accurate, preferable, and less expensive alternative to a traditional blood draw after total joint replacement. Conclusion. Overall, the non-invasive hemoglobin monitoring system offered a similar hemoglobin reading to the standard lab-draw reading, while improving satisfaction and lowering cost. The system relies on adequate perfusion for measurement, and our study demonstrated that lower hemoglobin values may reduce finger-tip perfusion and affect the hemoglobin reading

The opposable thumb is one of the defining characteristics of human anatomy and is involved in most activities of daily life. Lack of optimal thumb motion results in pain, weakness, and decrease in quality of life. First carpometacarpal (CMC1) osteoarthritis (OA) is one of the most common sites of OA. Current clinical diagnosis and monitoring of CMC1 OA disease are primarily aided by X-ray radiography; however, many studies have reported discrepancies between radiographic evidence of CMC1 OA and patient-related outcomes of pain and disability. Radiographs lack soft-tissue contrast and are insufficient for the detection of early characteristics of OA such as synovitis, which play a key role in CMC OA disease progression. Magnetic resonance imaging (MRI) and two-dimensional ultrasound (2D-US) are alternative options that are excellent for imaging soft tissue pathology. However, MRI has high operating costs and long wait-times, while 2D-US is highly operator dependent and provides 2D images of 3D anatomical structures. Three-dimensional ultrasound imaging may be an option to address the clinical need for a rapid and safe point of care imaging device. The purpose of this research project is to validate the use of mechanically translated 3D-US in CMC OA patients to assess the measurement capabilities of the device in a clinically diverse population in comparison to MRI. Four CMC1-OA patients were scanned using the 3D-US device, which was attached to a Canon Aplio i700 US machine with a 14L5 linear transducer with a 10MHz operating frequency and 58mm. Complimentary MR images were acquired using a 3.0 T MRI system and LT 3D coronal photon dense cube fat suppression sequence was used. The volume of the synovium was segmented from both 3D-US and MR images by two raters and the measured volumes were compared to find volume percent differences. Paired sample t-test were used to determine any statistically significant differences between the volumetric measurements observed by the raters and in the measurements found using MRI vs. 3D-US. Interclass Correlation Coefficients were used to determine inter- and intra-rater reliability. The mean volume percent difference observed between the two raters for the 3D-US and MRI acquired synovial volumes was 1.77% and 4.76%, respectively. The smallest percent difference in volume found between raters was 0.91% and was from an MR image. A paired sample t-test demonstrated that there was no significant difference between the volumetric values observed between MRI and 3D-US. ICC values of 0.99 and 0.98 for 3D-US and MRI respectively, indicate that there was excellent inter-rater reliability between the two raters. A novel application of a 3D-US acquisition device was evaluated using a CMC OA patient population to determine its clinical feasibility and measurement capabilities in comparison to MRI. As this device is compatible with any commercially available ultrasound machine, it increases its accessibility and ease of use, while proving a method for overcoming some of the limitations associated with radiography, MRI, and 2DUS. 3DUS has the potential to provide clinicians with a tool to quantitatively measure and monitor OA progression at the patient's bedside

Introduction. Optimal implant position is critical to hip stability after total hip arthroplasty (THA). Recent literature points out the importance of the evaluation of pelvic position to optimize cup implantation. The concept of Functional Combined Anteversion (FCA), the sum of acetabular/cup anteversion and femoral/stem neck anteversion in the horizontal plane, can be used to plan and control the setting of a THA in standing position. The main purpose of this preliminary study is to evaluate the difference between the combined anteversion before and after THA in weight-bearing standing position using EOS 3D reconstructions. A simultaneous analysis of the preoperative lumbo pelvic parameters has been performed to investigate their potential influence on the post-operative reciprocal femoro-acetabular adaptation. Material and Methods. 66 patients were enrolled (unilateral primary THAs). The same mini-invasive anterolateral approach was performed in a lateral decubitus for all cases. None of the patients had any postoperative complications. For each case, EOS full-body radiographs were performed in a standing position before and after unilateral THA. A software prototype was used to assess pelvic parameters (sacral slope, pelvic version, pelvic incidence), acetabular / cup anteversion, femoral /stem neck anteversion and combined anteversion in the patient horizontal functional plane (the frontal reference was defined as the vertical plane passing through centers of the acetabula or cups). Sub-analysis was made, grouping the sample by pelvic incidence (<55°, 55°–65°, >65°) and by pre-operative sacral slope in standing position (<35°, 35°–45°, >45°). Paired t-test was used to compare differences between preoperative and postoperative parameters within each subgroup. Statistical significance was set at p < 0.05. Results. In the full sample, mean FCA increased postoperatively by 9,3° (39,5° vs 30,2°; p<0.05). In groups with sacral slope < 35° and sacral slope > 45°, postoperative combined anteversion increased significantly by 11,7° and 12,9°, respectively. In the group with pelvic incidence > 65°, postoperative combined anteversion increased significantly by 14,4°. There was no significant change of combined anteversion in the remaining subgroups. Discussion. In this series the FCA increased after THA, particularly in patients with a low or high sacral slope on the pre-operative evaluation in standing position. This may be related to a greater difficulty for the surgeon in anticipating the postoperative standing orientation of the pelvis in these patients, as they were standardly oriented during surgery (lateral decubitus). Interestingly the combined anteversion was also increased in patients with a high pelvic incidence that is commonly associated with a high sacral slope. Conclusion. Post-operative increase of anatomical cumulative anteversion has been previously reported using anterior approach. The FCA concept based on EOS 3D reconstructions brings new informations about the reciprocal femoro-acetabular adaptation in standing position. Differences found in combined anteversion before and after the surgery show that a special interest should be given to patients with high pelvic incidence and low or high sacral slope, to optimize THA orientation in standing position

Introduction. Understanding hip-spine relationships and accurate evaluation of the pelvis position are key- points for the optimization of total hip arthroplasty (THA). Hip surgeons know the importance of pelvic parameters and the adaptation mechanisms of pelvic and sub-pelvic areas. Literature about posture after THA remains controversial and adaptations are difficult to predict. One explanation can be the segmental analysis focused on pelvic parameters and local planning. In a significant number of patients a global analysis may be important as a cascade of compensatory mechanisms is implemented, the hip being only one of the links of this chain reaction. 3 parameters can be measured on full body images:. SVA (sagittal vertical axis) : horizontal distance between the vertical line through the center of C7 and the postero-superior edge of S1. T1 pelvic angle (TPA) : line from femoral heads to T1center and line from the femoral heads to S1center. TPA combines informations from both the sagittal vertical axis and pelvic tilt. Global Sagittal Angle (GSA) : line from the midpoint of distal femoral condyles to C7 center and line from the midpoint between distal femoral condyles to the postero-superior S1corner. The objective of this preliminary study is to report the post-operative evolution of posture after THA. Material and Method. 49 patients (28 women, 21 men, mean age 61 years) were enrolled for full-body standing EOS images before and after THA. The sterEOS software was used to measure pelvic parameters (sacral slope SS, pelvic incidence PI) and global postural parameters (TPA, GSA, SVA). Sub-analysis was made, grouping the sample by TPA (<14°, 14°–22°, >22°), by PI (<55°, 55°–65°, >65°) and by SS (<35°, 35°–45°, >45°). Paired t-test was used to compare differences between preoperative and postoperative parameters within each subgroup. Statistical significance was set at p < 0.05. Results. TPA, SVA and GSA may change independently following THA surgery. In the 2 groups with TPA< 19° and 14° <TPA< 22°, GSA and SVA decreased significantly after THA (p < 0.05). The difference was not significant in the group with TPA>22°. In the group with SS between 35° and 45°, the GSA and SVA decreased after THA (p < 0.05). In the group with SS > 45° only GSA decreased. In the group with PI < 55°, GSA and SVA decreased after THA. There was no significant change in the remaining subgroups. Discussion. This preliminary study confirms a decrease of GSA and SVA after THA. Some preoperative characteristics are observed in patients with significant global sagittal postural modifications: low to standard TPA, low PI or standard to high SS. Conclusion. Planning and prediction of sagittal postural changes after THA implantation is challenging. It is an important topic in patients with stiff and degenerative spine or in case of spinal fusion. In case of complex hipspine cases, the timing of the procedures can be a real concern. The combined analysis of SVA, TPA and GSA may open new perspectives for a more rationale planning of THA

Purpose. This report compares midterm results of open neck osteoplasty + neck osteotomy vs arthroscopic osteoplasty for severe Slipped Capital Femoral Epiphysis (SCFE). Method. Database from 2006 to 2013 identified 22 patients out of 187 operations for SCFE. 12 underwent Open Neck Osteotomy (ONO) and osteoplasty by Ganz surgical dislocation approach. 10 underwent Arthroscopic Osteoplasty (AO). The mean follow-up for the ONO and AO groups were 59 (46 – 70), 36.1 (33 – 46) months respectively. Results. The unpaired t-test showed that the post-operative corrections were significantly better in the ONO than the AO group. Slip angle (16.7° (1°–28.6°) Vs 47.1° (40.2° – 53.5°) p = .0003), head neck offset correction (5mm (2–13mm) Vs 0mm (0mm – 2mm) p = 0.0003), alpha angle (34.6° (23.2°–45.6°) Vs 61.88° (52.1° – 123°) p= 0.0003), Modified Harris Hip Score (MHHS) (90(86.2–99) Vs 75.5 (58.75 – 96.8) p= 0.003) and internal rotation p= 0.0002. Paired t-test showed significant improvement in corrections within the individual groups compared with their own preoperative values. The results of AO group were oblique plane slip angle (55° (47.7° – 63.2°) Vs 47.1° (40.2° – 53.5°) p= 0.001), alpha angle (90.7° (65° – 131°) Vs 61.88° (52.1° – 123°) p= 0.0001), head neck offset (0mm (−3 mm to 0mm) Vs 0mm (0mm – 2mm) p= 0.001) and MHHS (52.7 (28.7 – 89.1) Vs 75.5 (58.75 – 96.8) p= 0.0005). Complications in ONO group were varus malunion (1) and non-union(1) of the osteotomy. In the arthroscopic group persistent impingement in 3 patients and 5 were not able to return to sports. Conclusion. Our results showed improved hip function following arthroscopic osteoplasty in severe SCFE. Considering the risks of an open surgical dislocation we could find that arthroscopy contributed worthy improvement in hip function in low demand patients

Femoral neck fractures are the second cause of hospitalization in elderly patients. Nowadays it is still not clear whether surgical treatment may provide better clinical outcome than conservative treatment in patients affected by mental disorders, such as senile dementia. The aim of this study was to retrospectively assess mortality and clinical and functional outcome after hemi arthroplasty operation following intracapsular neck fractures in patients with senile dementia. Between 2008 and 2014, 819 patients were treated at our Orthopaedic Institute for neck fracture of the femur (mean age: 83.8 years old). Eighty-four of these showed clear signs of cognitive impairment at time of admission in the Emergency Department. Mental state of patients was assessed in all cases, as routine, at the Emergency Room with the Short Portable Mental Status Questionnaire (Sh-MMT) and the Mini Mental State Examination (MMSE). Patients were divided in two groups depending whether they were surgically treated with hemiarthroplasty (Group B, 46 patients; 35 females, 11 males; mean age: 88.5 y.o.) or conservatively treated (Group C, 38 patients; 28 females, 10 males; mean age: 79.5 y.o.). These two groups were compared with a matched case-control group of patients surgically treated with no mental disorders (Group A, 40 patients; 34 females, 6 males; mean age: 81.5 y.o.). Incidence of mortality, systemic or local complications and functional clinical outcomes were evaluated with the ADL score and the Barthel index. Mortality rate was 35% (14 patients) for Group A, 50% (21 patients) for Group B and 95% (22 patients) for Group C. Paired t-test, with significance rate set at 0.05, showed significant higher mortality rate in Group A compared to both Group B (p:0.02) and Group C (p:0.001), and also between Group B and Group C (p:0.01). Three orthopaedic complications were found in Group B (two cases of infection and one dislocation of the prosthesis) while none in Group A (p<0.001). There have been 14 overall general complication in Group A (33%), 16 in group B (38%) and 15 in Group C (65%), with significant higher rate in Group B vs. Group A (p:0.02) and in group C vs. Group B (p: 0.001). Activity daily living scale and Barthel Index results showed higher results in Group B than Group C both in terms of recovery of walking ability and daily living (hairdressing, wearing clothes, eating). For any figures or tables, please contact authors directly (see Info & Metrics tab above).

Introduction. Allogeneic blood transfusion (ABT) remains a widely used therapeutic intervention in patients undergoing total knee arthroplasty (TKA). There is mounting evidence that tranexamic acid (TXA), a powerful antifibinolytic, can significantly reduce perioperative blood loss with a concomitant lower ABT rate. In May 2012, TXA intravenous infusion was introduced as standard therapy in all patients undergoing major hip and knee arthroplasty. The TXA protocol included infusing 1 gm prior to incision and 1 gm after lowering the tourniquet. Nadir hemoglobin (Hb) level has been shown to be the single most important predictor of ABT in patients undergoing TKA. It is often used as the main trigger for ABT and in research trials examining restrictive transfusion trials. There is a paucity of information regarding the impact of TXA on Hb levels in patients undergoing primary TKA. The purpose of this retrospective study was to examine the impact of TXA on hemoglobin levels in primary TKA patients. Methods. Patients undergoing primary single, or bilateral, TKA from a single orthopedic surgeon from the years 2009–2010 before TXA infusion (n=78) were compared to patients undergoing the same operation after TXA was introduced as a therapeutic intervention (n=97). TKA is a very standardized operation that has stayed consistent over the convening years in terms of surgical technique and intra-operative management. The following Hb values were selected for analysis between the two groups: pre-surgical Hb value, immediate post-operative Hb, nadir Hb, and discharge Hb. Paired t-test was used for analysis with p-value set at 0.05. Additional data analysis included: length of stay (LOS) and rate of ABT. Results. Demographically, the control group was younger compared to the experimental group (60 vs. 64 years). Table 1 shows the difference in the selected Hb values between the two groups. There was no difference in Hb values going into surgery between the two groups. For all other Hb values, there was a significant difference between the control group and the TXA group throughout the postoperative period. In addition, Hb drift was significantly lower in the TXA group compared to the control group by 0.7 g/dl. ABT rate was 4% for the TXA group and 50% for the control group. The control group had a higher LOS compared to the TXA, 4.9 vs. 4.3 days. Conclusion. TXA infusion in the intraoperative period is an effective therapeutic intervention for reducing the downward drift of Hb levels throughout the postoperative period in patients undergoing TKA, and in turn, significantly impacts ABT rate and resource utilization

Posterior cruciate ligament deficiency (PCLD) leads to structural and proprioceptive impairments of the knee, affecting the performance of daily activities including obstacle-crossing. Therefore, identifying the biomechanical deficits and/or strategies during this motor task would be helpful for rehabilitative and clinical management of such patients. A safe and successful obstacle-crossing requires stability of the body and sufficient foot clearance of the swing limb. Patients with PCLD may face demands different from normal when negotiating obstacles of different heights. The objective of this study was thus to identify the biomechanical deviations/strategies of the lower limbs in unilateral PCLD during obstacle-crossing using motion analysis techniques. Twelve patients with unilateral PCLD and twelve healthy controls participated in the current study with informed written consent. They were asked to walk and cross obstacles of heights of 10%, 20% and 30% of their leg lengths at self-selected speeds. The PCLD group was asked to cross the obstacles with each of the affected and unaffected limb as the leading limb, denoted as PCLD-A and PCLD-U, respectively. The kinematic and kinetic data were measured with a 7-camera motion analysis system (Vicon, Oxford Metrics, U.K.) and two force plates (AMTI, U.S.A.). The angles of the stance and swing limbs (crossing angles) and the moments of the stance limbs (crossing moments) for each joint in the sagittal plane when the leading limb was above the obstacle were calculated for statistical analysis. A 3 by 2, 2-way mixed-model analysis of variance with one between-subject factor (PCLD-A vs. Control, and PCLD-U vs. Control) and one within-subject factor (obstacle height) was performed (α=0.05). Paired t-test was used to compare the variables between PCLD-A and PCLD-U (α=0.05). SAS version 9.2 was used for all statistical analysis. When the leading toe was above the obstacle, the PCLD group showed significantly greater hip flexion in the swing limb but decreased dorsiflexion in the stance limb, both in PCLD-A and PCLD-U (P<0.05). Greater knee flexion and greater ankle dorsiflexion were found in the leading limb in PCLD-A (P<0.05). Meanwhile, the PCLD group showed significantly decreased ankle plantarflexor but increased knee extensor crossing moments in the stance limb compared with the Control (P<0.05). None of the calculated variables were found to be significantly different between PCLD-A and PCLD-U (P>0.05). When crossing the obstacle, patients with PCLD reduced ankle plantarflexor moments that were mainly produced by the gastrocnemius. This may help reduce the posterior instability of the affected knee. Greater knee extensor crossing moments may also help reduce the posterior instability of the standing knee when the leading toe was above the obstacle. The changed joint kinetics as a result of PCLD were not only seen on the affected side but also on the unaffected side during obstacle-crossing. This symmetrical pattern may be necessary in performing functional activities that may require either the affected side or the unaffected side leading. These results suggest that rehabilitative intervention, including muscular strengthening, on both affected and unaffected sides are necessary in patients with unilateral PCLD

Background:. Long-Term Follow-Up Of Lung Function And Quality Of Life (Qol) In Those Undergoing Combined Anterior And Posterior Spinal Fusion (A/Psf) For Ais Is Not Well Documented With Only One Study Extending Beyond 2 Years. Aim:. To Evaluate Long-Term Change In Pulmonary Function And Qol Following A/Psf For Ais. Methods:. Patients Who Underwent A/Psf For Ais From 2005–2007 Were Prospectively Studied (2011/2012). Lung Function [Forced Expiratory Volume In 1 Second (Fev1) And Forced Vital Capacity (Fvc)] Was Performed Along With Qol (Srs-22 Questionnaire). Paired T-Test Was Used To Compare Pre- And Post-A/Psf Data. Results:. Paired Pre- And Post-A/Psf Data Were Available For 12 Patients Who Underwent A/Psf At Mean(Range) 13.8(11.8–15) Years. 9/12 Were Female. Mean(Range) Follow-Up Was 5.8(4.1–6.7) Years Post-Operatively. Height Increased From Mean (Sd) 169(9) Cm. Pre-Operatively To 175(5) Cm. At Follow-Up (P<0.01). Scoliosis Corrected From 100(15) To 29(11) Degrees (P<0.001). %Predicted Fev1 Was 60(19) Pre-Operatively Versus 62(19) Post-Operatively (P=0.32); And Fvc Was 62(19) Pre-And 64(13) Post-A/Psf (P=0.67). Overall Srs-22 Scores Improved From Baseline Mean(Sd) 3.6(0.3) To 4.6(0.4) Post-Operatively (P<0.001). Improvements In Srs-22 Domains For Function [3.9(0.2) Vs. 4.9(0.2), P<0.001], Pain [3.5(0.4) Vs. 4.5(0.5), P<0.001], Self-Image [3.3(0.3) Vs. 4.4(0.5), P<0.001] And Mental Health [3.7(0.5) Vs. 4.4(0.6), P<0.001] Were Also Noted. High Patient Satisfaction Rates [4.8(0.3)] Were Recorded. No Correlation Was Noted Between Changes In Fev1 (R=0.08, P=0.8) Or Fvc (R=0.01, P=0.97) And Change In Srs-22 Score. Conclusion:. Long-Term Follow-Up Of Ais Patients Suggests No Deficit In Pulmonary Function, Whilst Quality Of Life And Patient Satisfaction Are High 6 Years After Combined A/Psf. Conflict Of Interest Statement: No conflict of interest

Introduction: Majority of children with cerebral palsy patients suffer from fixed flexion contractures of their knees. Procedures commonly used to correct knee flexion deformities include hamstring release, anterior femoral hemiepiphyseodesis and femoral extension osteotomies. The latter procedure can cause neurovascular complications. Femoral stapling procedures are not very popular because of a theoretical risk of permanent physeal closure. We present our initial experience in correction of knee flexion deformity by using the 8-plate technique. This uses guided growth in the distal femoral physis to achieve gradual correction of the knee flexion deformity. Materials and Methods: We reviewed a consecutive series of 25 children with fixed flexion deformity of the knee who underwent anterior femoral hemiepiphysiodesis using a two-hole plate (8-plate) between April 2005 and April 2008. The pre-operative and postoperative knee flexion deformity (in degrees) and complication rates were also recorded. Paired t-Test was undertaken to assess the correction in the fixed flexion deformity post-operatively. Results: Total number of patients – 25, male:female = 19:6. Total number of limbs – 46. The mean age of the patients was 11.04 years (range between 4–16). Mean follow up time for the patients after they had undergone the procedure was 16.2 months (range 3 – 34). The Mean correction achieved − 21.52 degrees (range 5 – 40). Mean correction per month − 2.05 degrees. A paired ‘t’ test showed the correction was found to be highly statistically significant (p value < 0.001). Conclusion: We conclude that this is a simple technique with few complications to date. The learning curve for this procedure is 1 case. All patients in our series have shown promising results, with sustained gradual correction to date

Introduction. Primary stability is essential for long-term performance of cementless femoral components. There is debate as to whether collars contribute to primary stability. The results from experimental studies and finite element (FE) analysis have been variable and contradictory. Subtle differences in performance are often swamped by variation between cadaveric specimens in vitro, whereas FE studies tend to be performed on a single femur. However, FE studies have the potential to make comparisons of implant designs within the same cohort of femurs, allowing for subtle performance differences to be identified if present. This study investigates the effect of a collar on primary stability of a femoral prosthesis across a representative cohort of femurs. Materials and Methods. FE models were generated from QCT scans of eight cadaveric femurs taken from the Melbourne Femur Collection (4 male and 4 female; BMI: 18.7 – 36.8 kg.m-2; age: 59 – 80 years) which were of joint replacement age. Heterogeneous bone material properties were assigned based on the CT greyscale information. Each femur was implanted with the collared and collarless version of Corail femoral stem (DePuy, Leeds, United Kingdom). The stems were sized and positioned so that the prosthesis filled the medullary canal with minimal gap between the prosthesis and the inner boundary of the cortical bone. The peak muscle and joint contact forces associated with level gait were applied and the distal femur was rigidly fixed. The forces were scaled based on the body weight for each subject. Micromotion, as well as microstrains at the bone-prosthesis interface were measured for each subject. Paired t-test was run to compare the micromotion and the microstrains measured for the collared and collarless prosthesis. Results. There were no significant differences in micromotion (p > 0.005) and microstrains (p » 0.005) between collared and collarless prostheses. The mean of the median micromotions for the collared and the collarless prostheses were 19.4 microns and 20.5 microns, respectively. The mean of the median equivalent strains at the bone-implant interface for the collared and the collarless prostheses were 828.5 microstrains and 824.3 microstrains, respectively. The mean percentage of the area at the contact interface that experienced equivalent strains lower than 2000 microstrains was 69.9% for the collared and 70.0% for the collarless designs. The mean percentage of the contact area at the bone-prosthesis interface that experience equivalent strains greater than 7000 microstrains, the yield strain, was only 9.9% for the collared and 5.7% for the collarless designs. Discussion and conclusions. There was considerable variation across the cohort of femurs, with a factor of two difference for both micromotion and interface strain While small differences were noted between the collared and collarless prostheses implanted in the same femur, these differences were minimal and were likely to have little affects on primary stability, at least for a level gait load case. More demanding load cases may result in greater differences between collared and collarless implants. The results suggest that the addition of a collar in routine cases may not enhance the primary stability of a cementless hip stem

The shoulder girdle is an extremely mobile joint. Rotator cuff tears alter the existing equilibrium between bony structures and muscles. The “subacromial impingement syndrome” resulting from this unbalance leads to an extension of the rotator cuff lesion. Many authors have postulated a “mechanism of compensation”, but its existence still requires evidence. According to this model, the longitudinal muscles of the shoulder and the undamaged muscles of the rotator cuff would be able to functionally compensate, supersede the function of rotator cuff, and reduce symptoms. The aim of this study was to evaluate muscular activation of the medium fibers of deltoid, the superior fibers of pectoralis major, the latissimus dorsi and the infraspinatus by a superficial electromyographic study (EMG) and the analysis of kinematics in patients with a massive rotator cuff tear. We evaluated 30 subjects: 15 had pauci-symptomatic massive rotator cuff tear (modest pain and preserved movement), and 15 were healthy controls. Paired t-test showed significant different activations (p< 0.05) of these 4 muscles between the pathological joint and the healthy one in the same patient. The unpaired t-test, after comparing the mean EMG values of the 4 muscles, produced a significant difference (p< 0.05) between the experimental group and control group. This study showed that a mechanism of muscular compensation is activated in patients suffering from rotator cuff tear, involving the deltoid and the infra-spinatus muscle, as already presented in literature, but also demonstrated the activation of 2 other muscles: the latissimus dorsi and the pectoralis major. It is, therefore, probable that, in these patients, these muscles, which would not normally pull the head of the humerus downwards, adapt in order to compensate for the pathological situation. We believe that these data are valuable in the surgical and rehabilitation planning in patients with a massive rotator cuff tear

Abstract. Objective. Explore whether high tibial osteotomy (HTO) changes knee contact forces and to explore the relationship between the external knee adduction moment (EKAM) pre and 12 months post HTO. Methods. Three-dimensional gait analysis was performed on 17 patients pre and 12-months post HTO using a modified Cleveland marker-set. Tibiofemoral contact forces were calculated in SIMM. The scaled musculoskeletal model integrated an extended knee model allowing for 6 degrees of freedom in the tibiofemoral and patellofemoral joint. Joint angles were calculated using inverse kinematics then muscle and contact forces and secondary knee kinematics were estimated using the COMAC algorithm. Paired samples t-test were performed using SPSS version 25 (SPSS Inc., USA). Testing for normality was undertaken with Shapiro-Wilk. Pearson correlations established the relationships between EKAM1 to medial KCF1, and EKAM2 to medial KCF2, pre and post HTO. Results. Total knee contact force peak 1 significantly reduced from 2.6 x body weight pre-HTO to 2.3 x body weight 12-months post-HTO. Medial contact force peak 1 significantly reduced from 1.7 x body weight pre-HTO to 1.5 x body weight 12-months post-HTO. Second peak lateral knee contact force significantly increased from 0.9 body weight pre-HTO to 1.1 x body weight 12-months post-HTO. Furthermore, this study found very strong correlations between EKAM1 and medial KCF1 pre-HTO (r=0.85) as well as post-HTO (r=0.91). There was a significantly moderate relationship between EKAM2 and medial KCF2 pre-HTO (r=0.625). Conclusion. HTO significantly reduced overall and medial KCF during the first half of stance whilst increasing second half of stance peak lateral knee contact force. This study demonstrated a strong relationship between EKAM peaks and respective medial KCF peaks, supporting the usefulness of EKAM as a surrogate measure of medial compartment tibiofemoral contact forces. This demonstrates HTO successfully offloads the tibiofemoral joint overall, as well as offloading the medial compartment