Introduction

The wrist is the ”key-stone” of hand function. Painless stability is a prerequisite for the rheumatoid wrist to perform various manual tasks. Synovectomy of the extensor tendons and the wrist joint with a Darrach procedure is offered for painful wrists, which are not controlled by conservative treatment with medication and orthosis. Radiolunate arthrodesis is performed on wrists with an unstable radiocarpal joint and preserved midcarpal joint space. This study describes the long-term (more than 10 years) follow-up of these operative procedures.

Materials and methods

The follow-up study was performed on 25 wrists in 25 rheumatoid patients (22 women and 3 men), whose average age was 52 years (range, 33 to 66 years) with an average disease duration of 12 years (range, 1 to 38 years). The average follow-up period was 12. 5 years (range, 10 to 18 years). Five wrists were Larsen-Dale-Eek’s grade II, 14 were grade III, and 6 were grade IV. Depending on the severity of bone destruction, the scaphoid in 6 wrists and the triquetrum in 3 wrists were included in the fusion site.

Results

Preoperative pain (88%) and swelling (96%) decreased remarkably at follow-up (12%, 4%). Average grip strength increased significantly from 100mmHg to 140mmHg (p< 0. 01). The total arc of wrist extension/ flexion decreased to two-thirds of the preoperative arc with a major loss in flexion (preop. : 26/28degrees, follow-up: 23/13degrees). The range of forearm rotation increased due to a Darrach procedure. In periodical X-ray assessments of 23 wrists, carpal collapse initially improved following the operation, however, it returned to the preoperative level after 5 years. Ulnar carpal shift improved significantly after the operation (p< 0. 01), and the position remained unchanged over 10 years. In palmar carpal subluxation, no remarkable change was noted. Bone union occurred in 87% of the operated wrists and the remaining 13% had fibrous union. Widening at the lunocapitate joint (> 2mm) was noted in 4 wrists (17%) and progressive instability at the midcarpal joint occurred in one wrist with the mutilating type of disease. Narrowing (< 1mm) was noted in 5 wrists (22%) and 3 wrists were totally fused in the functional position.

Discussion

Radiolunate arthrodesis provides good stability with some motion for the moderately deteriorated rheumatoid wrist more than 10 years after the operation, in spite of some radiological progression of the disease. This operation is considered to convert the natural course of the rheumatoid wrist from the unstable form to the stable form.

Introduction

The wrist is the ”key-stone” of hand function. Painless stability is a prerequisite for the rheumatoid wrist to perform various manual tasks. Synovectomy of the extensor tendons and the wrist joint with a Darrach procedure is offered for painful wrists, which are not controlled by conservative treatment with medication and orthosis. Radiolunate arthrodesis is performed on wrists with an unstable radiocarpal joint and preserved midcarpal joint space. This study describes the long-term (more than 10 years) follow-up of these operative procedures.

Materials and methods

The follow-up study was performed on 25 wrists in 25 rheumatoid patients (22 women and 3 men), whose average age was 52 years (range, 33 to 66 years) with an average disease duration of 12 years (range, 1 to 38 years). The average follow-up period was 12. 5 years (range, 10 to 18 years). Five wrists were Larsen-Dale-Eek’s grade II, 14 were grade III, and 6 were grade IV. Depending on the severity of bone destruction, the scaphoid in 6 wrists and the triquetrum in 3 wrists were included in the fusion site.

Results

Preoperative pain (88%) and swelling (96%) decreased remarkably at follow-up (12%, 4%). Average grip strength increased significantly from 100mmHg to 140mmHg (p< 0. 01). The total arc of wrist extension/ flexion decreased to two-thirds of the preoperative arc with a major loss in flexion (preop. : 26/28degrees, follow-up: 23/13degrees). The range of forearm rotation increased due to a Darrach procedure. In periodical X-ray assessments of 23 wrists, carpal collapse initially improved following the operation, however, it returned to the preoperative level after 5 years. Ulnar carpal shift improved significantly after the operation (p< 0. 01), and the position remained unchanged over 10 years. In palmar carpal subluxation, no remarkable change was noted. Bone union occurred in 87% of the operated wrists and the remaining 13% had fibrous union. Widening at the lunocapitate joint (> 2mm) was noted in 4 wrists (17%) and progressive instability at the midcarpal joint occurred in one wrist with the mutilating type of disease. Narrowing (< 1mm) was noted in 5 wrists (22%) and 3 wrists were totally fused in the functional position.

Discussion

Radiolunate arthrodesis provides good stability with some motion for the moderately deteriorated rheumatoid wrist more than 10 years after the operation, in spite of some radiological progression of the disease. This operation is considered to convert the natural course of the rheumatoid wrist from the unstable form to the stable form.

Midfoot arthrodesis is the conventional surgical intervention for midfoot arthritis. Arthrodesis aims to stabilise, realign and fuse the affected joints, providing patients with improved pain and function. Current research neglects the measurement of patient reported outcomes. This study aimed to investigate objective, and patient reported outcomes of midfoot arthrodesis. The secondary aim was to identify variables predicting the development of non-union. An automated search of online patient records identified 108 eligible patients (117 feet). The rates of union, re-operations, and complications were calculated using radiographs and medical records. Logistic regression was used to model variables influencing the odds of non-union. All living patients were posted a Manchester Oxford Foot Questionnaire (MOx-FQ), a patient reported outcome assessment. Pre-operative MOx-FQ results were available in a minority of cases. Students t-test was used to compare pre- and post-operative MOx-FQ scores. The rate of union achieved was 74%. The rate of re-operations was 35%. The rate of complications was 14%. Bone grafts and staple fixation independently impacted the odds of non-union. Bone grafts decreased the odds of non-union, whilst staple fixation increased the odds. This finding agrees with the opinion of other researchers. We recommend the use of bone grafts, and the avoidance of fixation with staples. Previous attempts have been made to assess patient outcomes. However, this study is the first to use the MOx-FQ, a validated questionnaire. Therefore, this study establishes a baseline for improvements in patient reported outcomes

Anatomically specific fixation devices have become mainstream, yet there are anatomical regions and clinical conditions where no pre-contoured plates are available, such as for glenohumeral arthrodesis. In a case series of 4 glenohumeral arthrodesis patients, a consultant orthopaedic surgeon at GCUH implemented 3D printing technology to create reconstructions of each patient's shoulder girdle to pre-contour arthrodesis plates. Our aim was to quantify the cost-benefit & intra-operative time savings of this technique in glenohumeral arthrodesis. We hypothesized that the use of 3D printing for creating patient specific implants through pre-operative contouring of plates will lead to intra-operative time and cost savings by minimising time spent bending plates during surgery. This study analysed 4 patients who underwent shoulder arthrodesis by a single consultant orthopaedic surgeon at GCUH between 2017-2021. A CT-based life-size model of each patient's shoulder girdle was 3D printed using freely available computer software programs: 3D Slicer, Blender, Mesh Mixer & Cura. Once the patient's 3D model was created, plate benders were used to contour the plate pre-op, which was then sterilised prior to surgery. Arthrodesis was performed according to AO principles of fixation. The time spent pre-bending the plate using the 3D model was calculated to analyse the intra-op time and cost-saving benefits. For the 4 cases, the plate pre-bending times were 45, 40, 45 & 20 minutes (average 38.8 mins). The intra-op correction time to make small adjustments to the plate was 2 min/ case. 3 plates needed minor (3 degree) adjustment to fine-tune scapula spine contouring. 1 plate needed a 5 degree correction to fine-tune hand position. On average, the pre-bending of the plate saved approximately 38.8 mins intra-op/ case. These shorter anaesthetic and operating times equate to approximately $2586 saving/ case, given an estimate of $4000/hour of theatre costs. We conclude that pre-bending plates around 3D-printed life-size models of an individual's shoulder girdle prior to surgery results in approximately 38.8 mins time saving intra-op when used in shoulder arthrodesis. This is a viable and effective technique that will ultimately result in significant operative time and financial savings

Abstract. Background. Multiple devices can stabilise the MTP joint for arthrodesis. The ideal implant should be easy to use, provide reproducible and high quality results, and ideally enable early rehabilitation to enable faster return to function, whilst lessening soft tissue irritation. We prospectively evaluated the combination of the IO-Fix (Extremity Medical, NJ, USA) device which consists of an intra-osseous post and lag screw that offers these features with full bearing of weight after surgery. Methods. 67 feet in 65 patients were treated over 31 months. After excluding patients lost to follow-up, undergoing revision arthrodesis, or concomitant first ray procedures, there were 54 feet in 52 patients available with a minimum 12 month follow-up with clinical and radiographic outcomes. All patients were treated using a similar operative technique with immediate bearing of weight in a rigid soled shoe. Results. The mean MOXFQ score improved from 46.4 (range 18 – 64) before surgery to 30.2 (range 0 – 54) at 6 months after surgery (p=0.02), and 18.4 (range 0 – 36) (p< 0.001) at latest follow-up. Arthrodesis across the MTP joint was achieved in 52 feet (96%), at a mean of 61 days (range 39–201). Non-union was observed in two feet; superficial wound infections in two feet; and metalwork impingement in three feet. Conclusions. In the largest reported series to date, the IO-Fix device achieved a union rate of 96% across the MTP joint when coupled with immediate bearing of weight. Significant improvements were seen in patient reported outcomes with low complication rates

Aim & introduction. Infected knee with bone defect resulting from failed total knee arthroplasty (TKA) or destruction of native joint can necessitate restoration of segmental defect and arthrodesis for therapy of infection and maintenance of walking ability. In segmental knee defect external fixators or KAFO are not suitable, not comfortable and poor tolerated by elderly patients. Both custom-made Femoro-Tibial Nail (FTN) combined with acrylic cement spacer and Knee Arthrodesis Nail System (KANS) offer maintenance of supportive function of extremity and avoidance of leg length discrepance after removal of TKA. Method. The group consists of 13 patients. In 12 cases knee arthrodesis have been performed due to infection with bone defect after removal of infected TKA, and in 1case due to inflammatory destruction of native knee joint. In 7 cases FTN with ALAC spacer and in 6 cases KANS (5 cases Orthopedic Salvage System-OSS; 1 case Link KANS) was used. In cases treated with FTN the gap between distal femur and proximal tibia was filled with hand-made acrylic cement spacer loaded with selected antibiotic (2g per 40 g cement) so that the spacer finally gained cylindrical shape. Results. Stable knee was noted after 7 years in 4 of 7 knees treated with FTN with ALAC spacer and after 2 years in 6 of 6 after KANS. Infection free knee was gained after 7 years in 4 of 7 cases treated with FTN with ALAC spacer and after 2 years in 5 of 6 cases treated with KANS. Amputation was necessary after 6 years in 3 of 7 cases treated with FTN with ALAC spacer and after 2 years in none case treated with KANS. Complications occurred in 2 cases after FTN with ALAC spacer (1x: FTN breackage, 1x: stress fracture of femoral neck) and in 1 case after KANS (OSS implant failure). Replacement of FTN nail and cement spacer in 1 case and respectively revision of OSS KANS in 1 cases was performed. Conclusions. Compared with the KANS, custom-made FTN combined with ALAC spacer proved to be effective up to 6 years, but shoved higher rate of complications and amputations after 6 years. It can be considered as a temporary low-cost salvage procedure for infected TKA with segmental bone defect as 1. st. stage in two-stage arthrodesis for infected knee prosthesis

Ankle arthrodesis is the gold standard for treatment of end stage ankle arthritis. We analysed the data of 124 Ankle Arthrodesis (Open Ankle Arthrodesis (OAA) −27; Arthroscopic Ankle Arthrodesis (AAA)- 97) performed between January 2005 and December 2015 by fellowship trained foot and ankle surgeons in a single institution. Based on preoperative deformity (AAA- 28 degree valgus to 26 degrees varus; OAA- 41 degree valgus to 28 degree varus), they were subdivided into 2 groups based upon deformity more than 15 degrees. Union rates, time to union, length of hospital stay and patient related factors like smoking, alcoholism, diabetes, BMI were assessed. Mean age of patients was 60 years (Range 20 to 82 years)(Male:Female-87:32). Overall fusion rate was 93% in AAA and 89% in OAA (p=0.4). On sub group analysis of influence of preoperative deformity, there was no difference in union rates of AAA versus OAA. 7 patients in AAA and 3 in OAA required further procedures. Average time to union was 13.7 in AAA and 12.5 weeks in OAA (p=0.3). Average hospital stay was 2.6 days in AAA and 3.8 days in OAA (p=0.003). Smoking, alcoholism, Diabetes, BMI did not have any correlation with union rates. Although both AAA and OAA showed good union rates, hospital stay was significantly shorter in AAA. A larger deformity did not adversely affect union rates in AAA. Time to union was higher in AAA though it was statistically insignificant. Lifestyle risk factors did not have cumulative effect on union. We conclude that AAA is a reproducible method of treating end stage tibiotalar arthritis irrespective of preoperative deformity and patient related factors

Background. There is a general assumption amongst many patients – and some Surgeons- that 1. Metatarsophalangeal Joint Arthrodesis “in neutral plantigrade position” will postoperatively restrict the choice of shoes and heels in particular. To our knowledge no studies have been carried out to assess this further. Methods. A review of a single Surgeon's series of 25 patients and Radiographs following neutral 1.MTPJ Arthrodesis after 14 – 38 months follow up to assess the type of shoe and height of heel comfortably worn. Results. Out of 18 women whose 1. MTPJ was fused in neutral 12 were able to wear at least a 2 inch (5 cm) heel comfortably the remaining 6 wore mainly flat shoes because of contralateral disease or unrelated reasons. All men interviewed wore a wide range of different comfortable shoes. Conclusion. 1. MTPJ Arthrodesis in neutral does not restrict the choice of shoes/heels postoperatively. Our findings might further strengthen the argument in favour of Arthrodesis vs Joint replacement

Osteomyelitis is an inflammatory condition accompanied by the destruction of bone and caused by an infecting microorganism. Open contaminated fractures can lead to the development of osteomyelitis of the fractured bone in 3-25% of cases, depending on fracture type, degree of soft-tissue injury, degree of microbial contamination, and whether systemic and/or local antimicrobial therapies have been administered. Untreated, infection will ultimately lead to non-union, chronic osteomyelitis, or amputation. We report a case series of 10 patients that presented with post-operative infected non-union of the distal femur with or without prior surgery. The cases were performed at Padmashree Dr. D. Y. Patil Hospital, Nerul, Navi Mumbai, India. All the patients’ consents were taken for the study which was carried out in accordance with the Helsinki Declaration. The methodology involved patients undergoing a two-stage procedure in case of no prior implant or a three-stage procedure in case of a previous implant. Firstly, debridement and implant removal were done. The second was a definitive procedure in form of knee arthrodesis with ring fixator and finally followed by limb lengthening surgery. Arthrodesis was planned in view of infection, non-union, severe arthritic, subluxated knee, stiff knee, non-salvage knee joint, and financial constraints. After all the patients demonstrated wound healing in 3 months along with good radiographic osteogenesis at the knee arthrodesis site, limb lengthening surgeries by tibial osteotomy were done to overcome the limb length discrepancy. Distraction was started and followed up for 5 months. All 10 patients showed results with sound knee arthrodesis and good osteogenesis at the osteotomy site followed by achieving the limb length just 1-inch short from the normal side to achieve ground clearance while walking. Our case series is unique and distinctive as it shows that when patients with infected nonunion of distal femur come with the stiff and non-salvage knee with severe arthritic changes and financial constraints, we should consider knee arthrodesis with Ilizarov ring fixator followed by limb lengthening surgery

Introduction: Arthrodesis of the knee nowadays is used as a salvage procedure, commonly for patients with a failed TKR or in infected trauma cases. We present 4 patients with extensive bone defects following septic sequelae of trauma treated by Arthrodesis of the knee joint. Materials and Methods: Four patients (avg. 46.5 years; range 37–57 years; three male and one female) with longstanding infected non-union fractures (3 months–2 years) at the knee joint (three Tibial plateau and one distal femur) were treated by initial debridement and removal of dead or infected bone. This led to substantial bone defects (6–12 cm) of the debrided bone at the knee joint. The patients then underwent bone transport with a circular frame to compensate for this bone defect before achieving an Arthrodesis of the knee joint. Three patients also had a free muscle flap for soft tissue coverage before bone transport was begun. Results: Arthrodesis of the knee was achieved in all patients at an average time of 26 months (20–32 months). None of the patients have any active infection of the limb. Discussion and Conclusions: Knutson et al (1984) said that massive bone loss may substantially reduce the success rate of Arthrodesis of the knee. Wilde and Stearns (1989) noted decreased fusion rates with greater degrees of bone loss. In our series the bone defects were a sequelae of infective non–union, this further complicates the healing process. However, using circular frame for Bone transport to overcome the defect and to achieve compression at the Arthrodesis site is a useful technique for such challenging cases

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

Introduction: Arthrodesis of the knee nowadays is used as a salvage procedure, commonly for patients with a failed TKR or in infected trauma cases. We present 4 patients with extensive bone defects following septic sequelae of trauma treated by Arthrodesis of the knee joint. Materials and Methods: Four patients (avg. 46.5 years; range 37–57 years; three male and one female) with longstanding infected non-union fractures (3 months–2 years) at the knee joint (three Tibial plateau and one distal femur) were treated by initial debridement and removal of dead or infected bone. This led to substantial bone defects (6–12 cm) of the debrided bone at the knee joint. The patients then underwent bone transport with a circular frame to compensate for this bone defect before achieving an Arthrodesis of the knee joint. Three patients also had a free muscle flap for soft tissue coverage before bone transport was begun. Results: Arthrodesis of the knee was achieved in all patients at an average time of 26 months (20–32 months). None of the patients have any active infection of the limb. Discussion and Conclusions: Knutson et al (1984) said that massive bone loss may substantially reduce the success rate of Arthrodesis of the knee. Wilde and Stearns (1989) noted decreased fusion rates with greater degrees of bone loss. In our series the bone defects were a sequelae of infective non-union, this further complicates the healing process. However, using circular frame for Bone transport to overcome the defect and to achieve compression at the Arthrodesis site is a useful technique for such challenging cases

Aims

In cases of severe periprosthetic joint infection (PJI) of the knee, salvage procedures such as knee arthrodesis (KA) or above-knee amputation (AKA) must be considered. As both treatments result in limitations in quality of life (QoL), we aimed to compare outcomes and factors influencing complication rates, mortality, and mobility.

We report our experience with glenohumeral arthrodesis as a salvage procedure for epilepsy-related recurrent shoulder instability. A total of six patients with epilepsy underwent shoulder fusion for recurrent instability and were followed up for a mean of 39 months (12 to 79). The mean age at the time of surgery was 31 years (22 to 38). Arthrodesis was performed after a mean of four previous stabilisation attempts (0 to 11) in all but one patient in whom the procedure was used as a primary treatment. All patients achieved bony union, with a mean time to fusion of 2.8 months (2 to 7). There were no cases of re-dislocation. One revision was undertaken for loosening of the metalwork, and then healed satisfactorily. An increase was noted in the mean subjective shoulder value, which improved from 37 (5 to 50) pre-operatively to 42 (20 to 70) post-operatively although it decreased in two patients. The mean Oxford shoulder instability score improved from 13 pre-operatively (7 to 21) to 24 post-operatively (13 to 36). In our series, glenohumeral arthrodesis eliminated recurrent instability and improved functional outcome. Fusion surgery should therefore be considered in this patient population. However, since the majority of patients are young and active, they should be comprehensively counselled pre-operatively given the functional deficit that results from the procedure. Cite this article: Bone Joint J 2014;96-B:1525–9

There have only been a few studies in the literature which reported on the outcome of ankle arthrodesis in patients with hemophilia, furthermore the number of patients is usually low and the operative technique is not uniform. The aim of this study is to evaluate the outcome of surgery in hemophilic arthropathy of the hindfoot, using internal fixation. From 1983 to 2006, 20 fusions were performed in 13 consecutive patients due to advanced hemophilic arthropathy of the hindfoot. There were 11 ankle fusions, 1 isolated subtalar fusion and 8 ankle and subtalar fusions, 3 of the latter on a second operation. The mean age at operation was 38.7 years and the mean followup was 9.4 years. Preoperativelly the mean modified Mazur score was 47.7. In the majority of cases the ankle fusion was achieved by two crossing screws, while, for the subtalar fusion either staples were used, or the tibiotalar screws were extended to the os calsis. Arthrodesis of the ankle was successful in all but one patient, who was revised and progressed to fusion. The mean postoperative modified Mazur score was 94.9. There was also one painless incomplete union of the subtalar joint which did not need revision. There was no recurrent bleeding, and no deep infection. Arthrodesis with cross screw fixation and staples is a quick, simple and effective method for fusion of the hindfoot in patients with hemophilia

Arthrodesis is used most commonly as a salvage procedure for failed total knee arthroplasty (TKA). For successful arthrodesis, a stable fusion technique and acceptable limb mechanical alignment are needed. Although the use of intramedullary alignment rods might be helpful in terms of achieving an acceptable limb mechanical axis, fat embolism and intramedullary dissemination of an infection or reactivation of latent infection might occur in failed TKA cases. However, computer-assisted surgery allows precise cuts to be made without breaching medullary cavities. Here, the authors describe a case of knee arthrodesis performed by computer navigation and the Ilizarov method in a patient with a past history of infection. A 45-year-old man visited our hospital with failed total knee arthroplasy. Fortunately, even though infection was treated by debridement with component retention, mild heating was present over the knee, but ESR(erythrocyte sedimentation rate) and CRP(C-reactive protein) were within normal ranges. X-ray showed subsidence of the femoral component and a radiolucent line around the femoral component. Arthrodesis was planned for this patient due to disabling pain, a long-lasting severe functional deficit, failure of the primary TKA for ankylosed knee, and the patient’s poor economic status and his strong desire for arthrodesis. The computer navigation surgery system and the Ilizarov method were used for two reasons. The first reason was that the patient had a past history of infection. At pre-operative evaluation, even though ESR and CRP levels were within normal range, we could not completely rule out the possibility of latent infection due to suspicious findings such as long lasting disabling knee pain, mild heating over the knee, severe osteolytic radiographic changes around the femoral component. In that situation, inserting an IM rod to achieve acceptable mechanical alignment might have reactivated and disseminated a possible latent infection to the femoral or tibial medullary canals. The second reason was that we wanted to reduce the possibility of fat embolism by using computer navigation without instrumentation within the medullary canal. A CT-free, wireless computer navigation system was applied, with trackers fixed to the femur and tibia and no requirement for the use of an IM rod with component retention. Navigated femoral and tibial bone resections were then performed using Stryker software. The femoral resection was conducted at 0° of flexion to the sagittal axis, and the tibial resection at 7 ° of flexion to the sagittal axis. Arthrodesis was held in proper axial and rotational alignment with bone surfaces compressed together. Finally, knee arthrodesis was completed using the Ilizarov method. Based on our experience of the described case, we believe that arthrodesis for failed TKR, especially failure secondary to intraarticular infection, can be considered as another indication for computer navigation

Background. Clinical and anatomical complications from total knee replacement (TKR) procedures are debilitating, and include weakness, damage, and the loss of native anatomy. As the annual number of primary TKR surgeries in the United States has continued to rise, to a projected 3.48 million in 2030, there has been a concomitant rise in revision surgery. Damage to or loss of native knee anatomy as a result of TKR revision can leave the patient with irreversible knee dysfunction, which is a contra-indication for most TKR systems on the market. This leaves the multi-revision patient with limited medical options. Complete fusion of the joint, known as arthrodesis, is indicated in some cases. Arthrodesis is also commonly indicated for traumatic injury, bone loss, quadriceps extensor mechanism damage, and osteosarcoma. While this treatment may resolve pain and allow a patient to walk, the inability to flex the knee results in considerable functional complications. Patients with arthrodesis are unable to drive, sit in close-quarter spaces, or engage in a significant number of activities of daily living. Product Statement. The authors have developed and patented the Engage Knee System, a novel TKR system that allows a patient to lock and unlock the knee joint by means of a handheld, non-invasive device. An internal locking mechanism is constructed of materials that have been used in orthopedic joint replacements that have been approved through the FDA 510(k) process. A lightweight, handheld magnetic device is used to actuate the locking mechanism. No percutaneous components are required or present. This device allows a patient to lock their knee joint in full extension to ambulate with the functional equivalence of an arthrodesis, but allows a patient to unlock the device and bend the knee to engage in passive activities that would be otherwise difficult or impossible. The IP portfolio for this technology is owned by Clemson University, and they are seeking a partner/licensee to pursue further technology development and validation. Methods. A literature review of knee arthrodesis incidence and prevalence has been published by the inventors. Three- dimensional gait analysis was used to characterize rigid-knee gait kinematics and kinetics to verify potential implant design loads. Multiple physical prototypes of the design were created and implanted in Sawbones synthetic knee models, and a final prototype using industry-standard arthroplasty materials was contract-manufactured. Results. The Engage system is capable of locking and unlocking in full extension with the use of a non-invasive hand-held device. The device will support the loading patterns and magnitudes during stiff knee gait, as estimated through gait analysis and musculoskeletal modeling, when it is locked in full extension. Conclusion. The Engage Knee System bridges the gulf between existing treatments, and addresses not only patients who would otherwise undergo arthrodesis, but also patients who have avoided treatment or who currently undergo high-risk revision procedures. The device is also a viable option for arthrodesis takedown, providing patients who have already undergone arthrodesis a means of regaining knee flexion

Arthrodesis of the wrist is a standard operation which is indicated for severe rheumatoid arthritis in which destruction is too advanced for more conservative procedures, or after failure of previous surgery. We have developed an L-shaped plate designed for this purpose. It provides rigid internal fixation with the wrist in the neutral position and utilises bone grafts obtained from the distal ulna and the carpal bones. We have carried out 29 successful fusions between 1992 and 1995. In all 29 patients synovectomy and resection of the head of the ulna were performed; 11 also had reconstruction of ruptured extensor tendons. All the patients obtained bony union, pain relief and improved function

Introduction. Arthrodesis is usually offered to patients in whom a two stage exchange arthroplasty has already failed or is likely to fail because of local factors (such as soft tissue damage, bone loss or poor perfusion), or because of systemic conditions which categorise the patient as a C-host (e.g. immune deficiency, diabetes and malnutrition). In other words arthrodesis is selected for patients with the worst prognosis. Method. I use an intramedullary nail extending from trochanter to just above the ankle which is locked distally only. The nail is curved with an arc of a 2 meter radius. This conforms to the shape of the femur and when passed through to the straight tibia it ends against the posterior cortex of the distal tibia where the bone is thickest. It creates an angle of between 9° and 11° of flexion at the knee. The nail is bent into 5° of valgus at the point where the femur and tibia meet. This allows the two bones to coapt, dynamise and unite. The procedure is performed in two stages. At the first every effort is made to eradicate the infection by debridement and appropriate local and systemic antibiotics. The nail is inserted at the second procedure and again every effort is made to deal with infection. If infection persists one can easily remove the nail when the knee has fused, and repeat the attempt to eradicate the infection in better circumstances. I have devised a scoring system in order to evaluate the eradication of infection based on clinical grounds, laboratory investigations and radiological examination. This allows for the fact that cure of an infection is not based on any one parameter. Results. I have performed such an arthrodesis in 99 patients. Fusion occurred in 74% of those who had more than six months follow-up. The affected limb was shortened on average by 4 cm. After nailing, pain was relieved in 80% of patients using a sliding scale. Using the scoring system, 31% were definitely cured of infection, 34.5% were intermediate and 34.5% definitely failed. 29 patients had their nail removed and the infection was re-addressed. Using the same evaluation system 12 (24%) were definitely cured, 12 (24%) had a probable cure and 5 (18%) remained infected. This gives an overall eradication of infection of 84%. In 4 patients apparent union of the knee broke down resulting in a jog of movement at the knee. Three of these patients were made comfortable with a gaiter to support the knee. One had his knee re-fixed with a long intramedullary nail. Three nails fractured in situ. In one of these patients the nail had locking screws proximally and distally which prevented dynamisation and union. In the other two non-union was apparent and the nail sustained a fatigue fracture. NO DISCLOSURES

1. Arthrodesis of the hip is satisfactory provided a good range of knee flexion is preserved. 2. The hip is best arthrodesed in its deformed position, and the deformity corrected by a high femoral osteotomy. Knee range can readily be retained by treating the patient on traction for the first six weeks instead of using plaster. 3. Thirty-three arthrodeses were attempted without osteotomy. Only thirteen were satisfactory. Even our best method without osteotomy gave sound fusion in only seven out of ten cases. 4. In a series of twenty-three unselected cases in which osteotomy was performed in addition to other methods, fusion occurred in twenty-two