Abstract. Introduction. Minimum clinically important differences (MCIDs) are critical to understanding changes in patient-reported outcome measure (PROM) scores after total joint arthroplasty (TJA). The usage and adoption of MCIDs not been well-studied. This study was performed to IDENTIFY trends in PROM and MCID use after TJA over the past decade. Methods. All articles published in the calendar years of 2010 and 2020 in CORR, JBJS, and the Journal of Arthroplasty were reviewed. Articles relating to clinical outcomes in primary total hip arthroplasty (THA) or total knee arthroplasty (TKA) were included. For each article, all reported PROMs and (if present) accompanying MCIDs were recorded. The use of PROMs and MCIDs were compared between articles published in 2010 and 2020. Results. Overall, 263 articles from 2010 and 546 articles from 2020 were included. The total number of articles reporting any PROM after THA and TKA increased from 131 in 2010 to 194 in 2020, but the proportion of articles reporting PROMs decreased from 49.8% (131/263) to 35.5% (194/546). Both the total number and proportion of articles reporting MCIDs increased from 2.3% (3/131) in 2010 to 16.5% (32/194) in 2020. These trends persisted when analyzing THA and TKA articles individually. Conclusions. Both the absolute number and proportion of articles reporting MCIDs in conjunction with PROMs after TJA has increased in the past decade but remains low. We recommend that journal editors and meeting organizers encourage the inclusion of MCID information in all reports on clinical outcomes after joint replacement

Abstract. INTRODUCTION. 10% of patients with knee osteoarthritis (OA) have disease confined to the patellofemoral joint (PFJ). The main surgical options are total knee replacement (TKR) and PFJ replacement (PFJR). PFJR has advantages over TKR, including being less invasive, bone preserving, allowing faster recovery and better function and more ‘straight forward’ revision surgery. We aim to compare the clinical results of revised PFJR with primary TKR taking into consideration the survival length of the PFJR. METHODOLOGY. Twenty-five patients (21 female) were retrospectively identified from our arthroplasty database who had undergone revision from PFJR to TKR (2006–2019). These patients were then matched with regards to their age at their primary procedure, sex and total arthroplasty life (primary PFJ survival + Revision PFJ time to follow up) up to point of follow-up with a group of primary TKRs implanted at the same point as the primary PFJR. RESULTS. Mean survival of the PFJs revised were 4.2 years. In the PFJR revision group (mean arthroplasty life 7.8 years) mean Oxford knee score (OKS) at latest follow up was 27.8. In the primary knee group (mean arthroplasty life 7.5 years) mean OKS was 32.4. This difference was not statistically significant. All PFJR revisions were performed using primary prostheses. CONCLUSION. PFJR provides comparable clinical outcome even after revision surgery to TKR as primary TKRs at midterm follow up and should be considered in all patients meeting the selection criteria. Given comparable proms and straight forward revisions, staged arthroplasty to preserve bone-stock is a reasonable choice

Aims. The aim of this study was to observe the implications of withholding total joint arthroplasty (TJA) in morbidly obese patients. Patients and Methods. A total of 289 morbidly obese patients with end-stage osteoarthritis were prospectively followed. There were 218 women and 71 men, with a mean age of 56.3 years (26.7 to 79.1). At initial visit, patients were given information about the risks of TJA in the morbidly obese and were given referral information to a bariatric clinic. Patients were contacted at six, 12, 18, and 24 months from initial visit. Results. The median body mass index (BMI) at initial visit was 46.9 kg/m. 2. (interquartile range (IQR) 44.6 to 51.3). A total of 82 patients (28.4%) refused to follow-up or answer phone surveys, and 149 of the remaining 207 (72.0%) did not have surgery. Initial median BMI of those 149 was 47.5 kg/m. 2. (IQR 44.6 to 52.5) and at last follow-up was 46.7 kg/m. 2. (IQR 43.4 to 51.2). Only 67 patients (23.2%) went to the bariatric clinic, of whom 14 (20.9%) had bariatric surgery. A total of 58 patients (20.1%) underwent TJA. For those 58, BMI at initial visit was 45.3 kg/m. 2. (IQR 43.7 to 47.2), and at surgery was 42.3 kg/m. 2. (IQR 38.1 to 46.5). Only 23 patients (39.7%) of those who had TJA successfully achieved BMI < 40 kg/m. 2. at surgery. Conclusion. Restricting TJA for morbidly obese patients does not incentivize weight loss prior to arthroplasty. Only 20.1% of patients ultimately underwent TJA and the majority of those remained morbidly obese. Better resources and coordinated care are required to optimize patients prior to surgery. Cite this article: Bone Joint J 2019;101-B(7 Supple C):28–32

Background. Early mobilization after total joint arthroplasty decreases postoperative complications and optimizes future functional outcomes. The purpose of this study was to evaluate the effectiveness of a supervised patient ambulation program following total joint arthroplasty. Methods. In 2014, our institution initiated a mandatory supervised patient ambulation program termed “No One Walks Alone” (NOWA). The program requires that all patients who mobilize are accompanied by a nurse or physical therapist. Gait belts are worn whenever a patient ambulates. Bed and chair alarms are utilized to alert if a patient tries to ambulate alone. If a patient experiences a fall, he or she is immediately evaluated by the nursing staff, and details regarding the fall and any injury sustained are documented. A retrospective review of patients undergoing total knee or hip arthroplasty between 2011–2017 was conducted. Patients who had surgery between 2011–2013, before the program, were included in the pre-implementation group (N= 3,069) and those having surgery between 2016–2017, after the program started, were included in the post-implementation group (N=3,947). The incidence of patient falls, fall-related complications were compared between groups. Results. The number of patient falls was 23 in the pre-implementation group (0.7%) and 9 in the post-implementation group (0.2%). Fall-related complications occurred in 14 of 23 falls in the pre-implementation group (0.5% overall) and 2 of 9 falls in the post-implementation group (0.05% overall) (p<0.001). Patients who experienced a fall were more likely to have undergone total knee arthroplasty (81.3%) compared to those who did not fall (58%) (p=0.008). Conclusion. A supervised patient ambulation program can be successful at reducing the incidence of patient falls and complications related to falls in the immediate postoperative setting

Introduction. Unexpected cancellation of scheduled total joint arthroplasty (TJA) procedures create patient distress and are disruptive to the clinical team. The purpose of this study was to identify the etiology of cancellation for scheduled TJA and to determine the subsequent fate of those patients. Methods. A consecutive series of 11670 primary THA and TKA patients at a single institution was reviewed from January 2013 through March 2017. All patients who were scheduled for a primary THA or TKA and subsequently cancelled were identified. The etiology of cancellation and time to rescheduling were recorded. Univariate analysis and cox regression models were performed. Results. 505 (4.3%) of the 11,670 scheduled patients had their surgery cancelled. 209 (42%) were due to medical reasons and 173 (34%) were secondary to patient preference. 391 patients (77%) eventually underwent their procedure at a mean delay of 165 days (19 –1908 days). The most common medical reasons for cancellation included cardiac disease (n=44, 21%), hyperglycemia (n=32, 15%) and dental infections (n=24, 11%). Only 53 (25%) patients cancelled for a medical reason underwent further diagnostic or therapeutic intervention for their medical condition. When compared to patient driven cancellations, those cancelled for medical reasons had a higher mean CCI (0.82 vs. 0.39, p<0.001), were cancelled closer to the scheduled surgery date (8.55 vs 18.1 days, p<0.001), had similar time periods between cancellation and rescheduling (159 vs 177 days, p=0.445) and were more likely to eventually undergo surgery (86% vs. 73%, p=0.004). Conclusion. TJA surgeries are most often cancelled due to a medical concern. Yet, only a minority of these patients undergo intervention for that medical condition. Cancelled patients have their surgery delayed, on average, over 5 months. To minimize the risk of cancellation, healthcare providers should consider early referral of medically complex patients to the patient's primary care physician

Introduction. Morbid obesity (BMI>40) is a significant risk factor for complications following total joint arthroplasty (TJA). As such many have a restrictive practice of withholding elective primary TJA in the morbidly obese. The purpose of this study was to observe the implications of this practice. Methods. From 2012 to 2014, 289 patients with morbid obesity and end-stage OA of the hip or knee were prospectively followed. At initial visit, patients were given a packet on risks of TJA in the morbidly obese and referral information to a weight loss clinic. Patients were contacted at 6, 12, 18 and 24 months from initial visit for PROs, and BMI changes. The average age of patients was 56 (26.7–79.1) there were 218 females and 71 males. Results. The average BMI at initial visit was 46.9 (39.9–68.2). 85 patients (29%) refused additional follow up or to answer phone surveys regarding their status. 146 patients (50.5%) have not had surgery. Initial BMI in this cohort was 47.4 (39.9–68.6) and at last follow up was 46.8 (28.9–70.8). Of those, 11 (7.5%) had a last follow up BMI≤40. Only 23% of patients went to the bariatric clinic and 13% had bariatric surgery. Fifty-eight patients (20.1%) underwent TJA. BMI at initial visit was 45.3 (40.3–55.4), and at the time of surgery was 41.3 (27.5–69.5). Only 20 patients (6.9% of those followed) have successfully achieved BMI < 40 and had surgery. Of those, 14 (70%) had a last follow up BMI≤40, and 2 (10%) had a last follow up BMI≤30. Conclusions. The practice of restricting total joint replacement to morbidly obese patients does not serve as an incentive to lose weight prior to arthroplasty. Only 20% of patients ultimately underwent TJA and the majority of those remained morbidly obese. Better resources and collaborative care among specialties is required to optimize patients prior to surgery

Introduction. Pulmonary embolism (PE) complicates up to 1% of total joint arthroplasties (TJA). Many PE treatment guidelines call for immediate initiation of therapeutic anticoagulation. Options include Xa inhibitors, Enoxaparin, and Warfarin. Deciding between these is a balance of the efficacy and the risks. Little data exists regarding the risks of each of these treatment options for treating PE in arthroplasty patients. Methods. We examined the records of 29,270 patients who underwent a primary total joint arthroplasty (TJA), defined as a unilateral total knee arthroplasty (TKA) (18,987) or total hip arthroplasty (THA) (10,283), between 2/2016 and 12/2018 at our institution and identified 338 (242 TKA, 96 THA) patients who developed an in-hospital PE treated with therapeutic anticoagulation. The patients were treated with therapeutic doses of Xa inhibitors, enoxaparin or warfarin. The type and frequency of complications were determined and classified as major or minor. Major complication included: bleeding requiring surgery, GI bleed requiring treatment, >2 unit transfusion and mortality. Minor complications included wound drainage, bleeding not requiring surgery, and thrombocytopenia. Results. Overall complication rates were high for all treatments. Xa inhibitors had the lowest complication rate at 14% compared to 20% for enoxaparin and 20.7% for warfarin though the difference did not quite reach statistical significance (p=.054). Both major and minor complication were lower with Xa inhibitors, but again the difference was not statistically significant (p=0.67). There was no significant difference in complications between TKA groups (p=0.73) or THA groups (p=0.83). Gender and body mass index were not predictive of major or minor complications. Discussion. Our results demonstrate high complication rates associated with modern therapeutic anticoagulation protocols for perioperative PE following TJA. Patients who receive therapeutic anticoagulation postoperatively are at high risk for complication. Xa inhibitors may decrease these risks, but larger studies are required

Introduction. Patient reported outcome measures (PROMs) are increasingly used as quality benchmarks in total joint arthroplasty (TJA). The objective of this study was to investigate whether PROMs correlate with patient satisfaction, which is arguably the most important and desired outcome. Methods. An institutional joint database was queried for patients who underwent primary, elective, unilateral TJA. Eligible patients were asked to complete a satisfaction survey at final follow-up. Correlation coefficients (R) were calculated to quantify the relationship between patient satisfaction and prospectively collected PROMs. We explored a wide range of PROMs including Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC); Short Form-12 (SF-12), Oxford Hip Score (OHS), Knee Society Clinical Rating Score (KSCRS), Single Assessment Numerical Evaluation (SANE), and University of California Los Angeles activity level rating (UCLA). Results. In general, there was only weak to moderate correlation between patient satisfaction and PROMs. Querying the absolute postoperative scores had higher correlation with patient satisfaction compared to either preoperative scores or net changes in scores. The correlation was higher with disease-specific PROMs (WOMAC, OHS, KSCRS) compared to general health (SF-12), activity level (UCLA), or perception of normalcy (SANE). Within disease-specific PROMs, the pain domain consistently carried the highest correlation with patient satisfaction (WOMAC pain subscale, R = 0.45, p <0.001; KSCRS pain subscale, R = 0.49, p <0.001). Conclusion. There is only weak to moderate correlation between PROMs and patient satisfaction. PROMs alone are not the optimal way to evaluate patient satisfaction. We recommend directly querying patients about satisfaction and using shorter PROMs, particularly disease-specific PROMs that assess pain perception to better gauge patient satisfaction. For figures, tables, or references, please contact authors directly

Introduction. Patients who undergo total joint arthroplasty (TJA) are at a high risk for the development of thromboembolic complications. The rate at which venous thromboembolism occurs following TJA has been reported to be between 1.3–9.4%. As a result, the utilization of prophylactic therapies is considered standard of care in this patient population. The primary purpose of the current study was to 1) evaluate patient satisfaction with the use of intermittent compression devices 2) evaluate the risk of self-reported falls secondary to the use of these devices following TJA. Methods. This is a single institution, prospective study on patients who underwent TJA at an urban, academic orthopedic specialty hospital. Patients were surveyed using an electronic patient rehabilitation application regarding their use and satisfaction with their home intermittent compression devices with a battery and power cord attachment that the patient must wear while using the devices. They were also asked if any falls or near-falls they may have experienced. Surveys were administered on postoperative Day 14, and patients were given 10 days to submit their responses. Using our institutions data warehouse, patient demographics were also collected (Table 1). Results. Survey responses were collected from 479 patients who underwent TJA between August 2018 and October 2018. Of the respondents, 278 were female and 201 were male. Approximately 79% of patients in the cohort were satisfied with their use of their compression devices compared to 21% of patients who were unsatisfied. During this time, 16% of patients (75 pts) also reported at least one tripping episode at home and 11 patients (2.3%) had at least one fall at home. Conclusion. These results suggest that patients are generally satisfied with their home intermittent compression devices. There are a significant number of trips or falls after surgery and further study examining the potential role of these devices and their cords in these falls is needed. For figures, tables, or references, please contact authors directly

Introduction. In recent years, online patient portals have been developed to offer the potential of an enhanced recovery experience. By offering videos, communication tools and patient-reported outcomes collection, online portals encourage patient's engagement in their care. In the total joint arthroplasty population, portals may also offer online physical therapy, allowing TJA patients to reach functional goals while reducing costs. Although technology may offer the potential of an enhanced recovery experience, disparities may exist between the comfort level of use and communication preferences of different patient populations. Our study aimed to analyze the utilization of an internet based patient portal, and quantify the impact of usage on patient reported outcome measures. Methods. 4,458 patients who underwent TJA across 8 major academic centers within one healthcare system were analyzed. Patients who scheduled surgery were registered for the online portal by the surgical coordinator. Upon registration, patients opt-in by signing a license agreement, and data is collected on their utilization of the portal including logins, exercise and educational videos watched, messages sent and PROs completed. Age was compared to utilization, opt-in rates, total videos watched, and messages sent. Two separate patient cohorts were identified to distinguish between active and non-active users. Anyone who opted-in and viewed over 5 preoperative videos or had at least 5 preoperative logins were considered active users. Patients’ postoperative KOOS-JR and HOOS-JR score improvements from baseline were compared between the active vs. non-active groups. Results. Of 4,458 total TJA patients, TKA and THA comprised 2670 and 1788, respectively, with an average age of 65.9 years (range 16–96 years). On average, patients logged into the portal 3.7 times preoperatively and 6.8 times postoperatively, and sent 2.29 messages. On average, 13 videos were watched preoperatively and 17 videos were watched postoperatively. Of all TJA patients, 72% opted-in to the portal. When looking solely at the TKA cohort, there was a significant difference in age between those patients that provided an email and those who didn't. The mean age of those who did provide an email was 66.3 years old, patients who didn't were on average 69.7 years old (p =.001). There was no significant impact of age on total preoperative or postoperative logins when considering both TKA and THA patients. There was a significant difference between age and preoperative or postoperative logins in the TKA group, with older patients tending to log in less (p =.001) and send fewer messages to the care team (p =.0001). Total videos watched preoperatively and postoperatively as well as preoperative logins did not impact change of HOOS JR scores at 6 weeks, 12 weeks, 6 months or 1 year. In the TKA cohort, the active user cohort correlated to greater improvement in KOOS-JR scores at 6 weeks, and 12 weeks postoperatively (p=.02, .018 respectively). Conclusion. While older TKA patients tended to be less engaged, the usage of the online portal overall was not impacted by age in the TJA population. As the average age of patients undergoing TKA continues to decrease, surgeons will be faced with a younger patient population that communicates heavily through technology. Previously published literature has proven online PT is as effective as traditional PT, making online portals a promising option to improve care while decreasing costs. As seen in our TKA population, patients experienced greater improvement in KOOS-Jr scores with greater activity and use of the portal

Aims

Spinal anaesthesia has seen increased use in contemporary primary total knee arthroplasties (TKAs). However, controversy exists about the benefits of spinal in comparison to general anaesthesia in primary TKAs. This study aimed to investigate the pain control, length of stay (LOS), and complications associated with spinal versus general anaesthesia in primary TKAs from a single, high-volume academic centre.

Introduction. There is little published evidence regarding cannabis or cannabinoid use among orthopedic patients, yet there is increasing public attention on its possible role in treating various medical conditions including pain. California passed legislation legalizing cannabis for medical treatment in 2003 and recreational use in 2018. All patients undergoing total joint arthroplasty (TJA) at our institution are screened preoperatively with a urine toxicology (UTox) screen. Though a positive test for other substances triggers surgery cancellation, a positive screen for cannabis and/or opiates does not impact whether surgery is performed. We sought to quantify the prevalence of cannabinoid and opioid use among patients with chronic pain from end-stage hip and knee osteoarthritis who underwent arthroplasty at our institution in 2012 and 2017. Methods. Institutional Review Board approval was obtained. A retrospective chart review was performed for all patients with severe arthritis who underwent total hip and knee arthroplasty (THA and TKA) at our institution during the calendar years 2012 and 2017. Patients were excluded if TJA was performed for acute trauma or if no pre-operative UTox screen was obtained. The UTox screen was used to determine preoperative cannabis and opioid use. Chi-squared testing was performed, and significance was defined as p<=0.05. Results. In the two years studied, 546 of 560 primary TJA surgeries (98%) had a pre-operative UTox screen performed. These 546 operations in 525 patients were reviewed (359 TKAs and 187 THAs). Comparing 2012 to 2017, the prevalence of preoperative cannabis use increased from 9% to 15% (p =.05) while the prevalence of opioid use decreased from 24% to 17% (p=.04). The proportion of patients who tested positive for both cannabis and opioids was low (3%) and did not change between 2012 and 2017 (p=.50). With the numbers available, patients who were using cannabis were no more or less likely to be taking opioids than non-cannabis users (p=.24). Discussion and Conclusion. To our knowledge, this is the first study to identify the prevalence and trends of cannabis use in patients undergoing TJA. At our institution, cannabis use increased more than 60% while opioid use decreased about 30% over a 5-year interval. Whether these findings are related remains unclear. Future directions will include studying postoperative opioid requirements, disposition, complications, and readmissions in TJA patients who use cannabis

Obesity is an epidemic across both the developed and developing nations that is possibly the most important current public health factor affecting the morbidity and mortality of the global population. Obese patients have the potential to pose several challenges for arthroplasty surgeons from the standpoint of the influence obesity has on osteoarthritic symptoms, their peri-operative medical management, the increased intra-operative technical demands on the surgeon, the intra- and post-operative complications, the long term outcomes of total hip and knee arthroplasty. Also, there is no consensus on the role the arthroplasty surgeon should have in facilitating weight loss for these patients, nor whether obesity should affect the access to arthroplasty procedures.

Introduction

Bundled Payments (BP) were a revolutionary new experiment for CMS that tested whether risk sharing for an episode of care would improve quality and reduce costs. The initial success of BP accelerated their growth as evidence by the launch of both mandatory and commercial bundles. Success in BP is dependent on the target price and the opportunity to reduce avoidable costs during the episode of care. There is concern that the aggressive target pricing methodology in the new model (BPCI-Advanced) penalizes high performing groups that already achieved low episode costs through prior experience and investment in BP. We hypothesize that this methodology incorporates unsustainable downward trends on target prices to a point beyond reasonableness for efficient groups to reduce additional costs and will lead to a large percentage of groups opting out of BPCI-A in favor of a return to fee for service (FFS) reimbursement.

Satisfactory primary wound healing following total joint replacement is essential. Wound healing problems can have devastating consequences for patients. Assessment of their healing capacity is useful in predicting complications. Local factors that influence wound healing include multiple previous incisions, extensive scarring, lymphoedema, and poor vascular perfusion. Systemic factors include diabetes mellitus, inflammatory arthropathy, renal or liver disease, immune compromise, corticosteroid therapy, smoking, and poor nutrition. Modifications in the surgical technique are necessary in selected cases to minimise potential wound complications. Prompt and systematic intervention is necessary to address any wound healing problems to reduce the risks of infection and other potential complications.

Cite this article: Bone Joint J 2013;95-B, Supple A:144–7.

Abstract. Introduction. Total joint arthroplasty (TJA) is one of the commonest and most successful orthopaedic procedures, used for the management of end-stage arthritis. With the recent introduction of robotic assisted joint replacement, Computed Tomography (CT) has become part of required pre-operative planning. The aim of this study is to quantify and characterise incidental CT findings, their clinical significance, and their effect on planned joint arthroplasty. Methodology. All consecutive patients undergoing an elective TJR (hip or knee arthroplasty) were retrospectively identified, over a 3-year period (December 2019 and December 2022). Data documented and analysed included patient demographics, type of joint arthroplasty, CT findings, their clinical significance, as well as potential delays to the planned arthroplasty because of these findings and subsequent further investigation. Results. A total of 624 patients (637 studies, 323 (51.8%) female, 301 (48.2%) male) were identified of which 163 (25.6%) showed incidental findings within the long bones or pelvis. Of these 52 (8.2%) were significant, potentially requiring further management, 32 (5.0%) represented potential malignancy and 4 (0.6%) resulted in a new cancer diagnosis. Conclusion. It is not currently national standard practice to report planning CT imaging as it is deemed an unnecessary expense and burden on radiology services. Within the study cohort 52 (8.2%) of patients had a significant incidental finding that required further investigation or management and 4 (0.6%) had a previously undiagnosed malignancy. In order to avoid the inevitability of a missed malignancy on a planning CT, we must advocate for formal reports in all cases

Aims. The purpose of this study was to compare outcomes of combined total joint arthroplasty (TJA) (total hip arthroplasty (THA) and total knee arthroplasty (TKA) performed during the same admission) versus bilateral THA, bilateral TKA, single THA, and single TKA. Combined TJAs performed on the same day were compared with those staged within the same admission episode. Patients and Methods. Data from the National (Nationwide) Inpatient Sample recorded between 2005 and 2014 were used for this retrospective cohort study. Postoperative in-hospital complications, total costs, and discharge destination were reviewed. Logistic and linear regression were used to perform the statistical analyses. p-values less than 0.05 were considered statistically significant. Results. Combined TJA was associated with increased risk of deep vein thrombosis, prosthetic joint infection, irrigation and debridement procedures, revision arthroplasty, length of stay (LOS), and in-hospital costs compared with bilateral THA, bilateral TKA, single THA, and single TKA. Combined TJA performed on separate days of the same admission showed no statistically significant differences when compared with same-day combined TJA, but trended towards decreased total costs and total complications despite increased LOS. Conclusion. Combined TJA is associated with increased in-hospital complications, LOS, and costs. We do not recommend performing combined TJA during the same hospital stay. Cite this article: Bone Joint J 2019;101-B:573–581

Introduction. Mechanical or corrosive failure of total knee arthroplasties (TKAs) is difficult to diagnose with current laboratory and radiographic analyses. As such, the goal of this study was to determine the mean blood concentration of cobalt, chromium, and titanium in a series of revision TKAs with mechanical implant failure and evaluate whether they facilitated identification of the underlying TKA failure mechanism. Methods. Serum cobalt, chromium, and titanium levels and synovial fluid characteristics were evaluated in 12 patients (13 aseptic revision TKAs) who underwent revision TKA between 2000 and 2020 at a single academic institution for mechanical implant failure or corrosion. Seventy-five percent were re-revisions of previously revised TKAs. Mean time to revision was 6 years. Modular metallic junctions were present in 100%. Twenty-five percent did not have another in situ total joint arthroplasty, and the remaining patients did not have a metal-on-metal articulation that could lead to elevation in serum metal ion levels. Mean follow-up after the revision TKA was 8 months. Results. Mean serum cobalt, chromium, and titanium concentrations were 11 ng/mL, 6 ng/mL, and 3 ng/mL, respectively. Serum metal ion levels facilitated failure mechanism identification in 75%, which included modular junction failure (6 cases), constraint locking mechanism failure (3 cases), corrosion of modular metallic interfaces (2 cases), and implant fracture (1 case). Arthrocentesis was performed in 75%. Mean synovial fluid cell count was 950 cells/mcL. Monocytes were the predominant mean cell type (41%), followed by neutrophils (35%), and lymphocytes (22%). Conclusion. Serum metal ion assessment should be considered when the etiology of painful primary or revision TKAs, particularly those with modular metallic junctions, remains elusive after routine evaluation

Background. The evaluation and management of outcomes risk has become an essential element of a modern total joint replacement program. Our multidisciplinary team designed an evidence-based tool to address modifiable risk factors for adverse outcomes after primary hip and knee arthroplasty surgery. Methods. Our protocols were designed to identify, intervene, and mitigate risk through evidence-based patient optimization. Nurse navigators screened patients preoperatively, identified and treated risk factors, and followed patients for 90 days postoperatively. We compared patients participating in our optimization program (N=104) to both a historical cohort (N=193) and a contemporary cohort (N=166). Results. Risk factor identification and optimization resulted in lower hospital length of stay and post-operative emergency department visits. Patients in the optimization cohort had a statistically significant decrease in mean LOS as compared to both the historical cohort (2.55 vs 1.81 days, P<0.001) and contemporary cohort (2.56 vs 1.81 days, p<0.001). Patients in the optimization cohort had a statistically significant decrease in 30- and 90-day ED visits compared to the historical cohort (P. 30-day. =0.042, P. 90-day. =0.003). When compared with the contemporary cohort, the optimization cohort had a statistically significant decrease in 90-day ED visits (21.08% vs. 10.58%, P=0.025). The optimization cohort had a statistically significant increase in the percentage of patients discharged home. We noted nonsignificant reductions in readmission rate, transfusion rate, and surgical site infections. Conclusion. Optimization of patients prior to elective primary THA and TKA reduced average LOS, ED visits, and drove tele-rehabilitation use. Our results add to the limited body of literature supporting this patient-centered approach

Introduction. Vancomycin is a commonly used antibiotic for prophylaxis in total joint replacement surgery. Several studies have reported superior local tissue concentration of vancomycin using intraosseous (IO) infusion compared with standard intravenous (IV) administration in total knee arthroplasty (TKA). We reviewed patients undergoing primary TKA who received IO vancomycin to a group receiving IV vancomycin. Methods. A retrospective review of 1038 patient who underwent primary TKA at our institution was performed from May 1, 2016 to May 1, 2019. This was a consecutive series of patients before and after we adopted this technique. IO vancomycin administration technique has been previously reported from our institution (500mg vancomycin in 200mL solution). Comparisons included preoperative and postoperative creatinine values, adverse reaction to vancomycin, tourniquet time, re-operation rates, periprosthetic joint infection rate at 1 year. Results. There were 482 patients in IO vancomycin group and 572 patients in IV vancomycin group. No differences between groups were present for patient age, sex, or BMI. No differences in creatinine values or tourniquet time were present and there were no adverse reactions to vancomycin in either group. Eight periprosthetic joint infections (1.4%) were reported in the IV group, and 1 (0.2%) periprosthetic joint infection was reported in the IO group at 1 year follow up, and this was statistically significant (p = 0.04, Fishers exact test). The overall reoperation rate was 1.7% (10 patients) in the IV group and 1.1% (5 patients), however, this was not statistically significant (p = 0.4371). The additional reoperations were for retained suture or small areas of poor superficial wound healing and were considered minor. Conclusion. Our study demonstrated that IO vancomycin in primary TKA reduced periprosthetic joint infection and is a safe and effective alternative to IV administration. Furthermore, IO infusion also eliminates the logistical challenges of timely prophylactic antibiotic administration before TKA