Aims. Limb salvage surgery (LSS) is the primary treatment option for primary bone malignancy. It involves the removal of bone and tissue, followed by reconstruction with endoprosthetic replacements (EPRs) to prevent amputation. Trabecular metal (TM) collars have been developed to encourage bone ingrowth (osseointegration (OI)) into EPRs. The primary aim of this study was to assess whether OI occurs when TM collars are used in EPRs for tumour. Methods. A total of 124 patients from July 2010 to August 2021 who underwent an EPR for tumour under the West of Scotland orthopaedic oncology team were identified. Overall, 81 patients (65%) met the inclusion criteria, and two consultants independently analyzed radiographs at three and 12 months, as well as the last radiograph, using a modified version of the Stanford Radiological Assessment System. Results. OI of the TM collar occurred in approximately 65% of patients at last radiograph. The percentage of patients with OI at three months (65.4%) reflected the 12-month (65%) and long-term (64.4%) follow-up. The median amount of OI across all radiographs was one at all three timepoints, with only five cases (11.1%) showing OI in all four zones at last radiograph. Radiolucency at the bone:collar junction was present in 23 cases (28.4%) at three months, but only four (6.7%) showed progression of this at 12 months. The interobserver reliability was found to be highly reliable in all parameters (p < 0.001). Conclusion. OI occurs in approximately 65% of TM collars, and is similar at three months, 12 months, and last radiograph. The extent of OI at the bone:collar junction was found to have decreased at longer-term follow-up. Furthermore, radiolucency at the bone-collar impact junction does occur in some patients but only a low number will show radiolucency progression at longer-term follow-up. Cite this article: Bone Jt Open 2024;5(12):1092–1100

Introduction: Total femoral endoprosthetic replacement can be an alternative to amputation following extensive tumour excision or in cases of severe bone loss. In skeletally immature patients the problem of leg length inequality may be overcome by the use of extendable prostheses. The aim of this study is to assess the functional outcome of patients following total femoral endoprosthetic replacement. Methods: This is a retrospective, single centre study of 16 patients who underwent consecutive total femoral replacements between 1978 and 1999. Information was collected from the Bone Tumour database, medical records and clinical review. The prostheses were custom made by the Biomedical Engineering Department of University College London and Stanmore Implants Worldwide. The implants are composed of a Titanium alloy shaft with Cobalt-Chrome bearing surfaces, incorporating a SMILES (Stanmore Modular Individualised Lower Extremity System) knee joint. Outcome was assessed using the Musculoskeletal Tumour Society (MTS) rating score. Sample: Eight patients were male and eight female. Mean age was 35 years (range 5–75 years). Ten patients underwent total femoral replacement as a primary procedure; nine for malignant tumour and one for hydatid disease. Of the patients with malignancy five had metastases at the time of presentation. The other indications were failed distal femoral replacement in four cases and periprosthetic fractures in the remaining two. Four children received extendable prostheses. Results: Of the patients with malignant disease, all but one had complete tumour excision. Three patients developed local recurrence. Two patients died of metastases within one year of diagnosis and three more died within five years. Three required revision procedures. Two more dislocated at the hip joint. Other complications included infection and lymphoedema. In patients surviving longer than one year the average range of motion at the hip was 85 degrees and at the knee 80 degrees. Using the MTS rating score the mean functional outcome was 60% of normal (range 27–90%). Of the survivors one achieved an excellent result, five were good, four fair and one poor. Conclusion: Total femoral endoprosthetic replacement can be effective in limb salvage and provide an alternative to amputation. Good functional results can often be achieved. However, the complication rate is high and the outcome extremely varied

Purpose: The aim of this study was to understand the effect of endoprosthetic reconstruction in treatment of solitary bone plasmacytoma threatening structural integrity of bone. Materials and methods: We retrospectively studied 11 patients who underwent endoprosthetic reconstruction for solitary bone plasmacytoma between 1988 and 2003 with more than 1 year follow up. Most had radiotherapy and those who sustained structural damage to a joint or thought to be salvageable were treated with endoprosthetic replacement. Results: There were 7 males and 4 females, with M: F ratio of 1.75:1, the median age at diagnosis was 53.61years (35–74). Average duration of symptoms prior to presentation at oncology unit was 7.27 months. We had 4 proximal femoral, 2 pelvic, 4 humeral and one tibial Plasmacytomas that were treated with endoprosthetic replacements.8/11 had preoperative radiotherapy for at least 4weeks and 3 did not. Two had postoperative radiotherapy and one adjuvant chemotherapy. Average follow up is 5.45 years (range 1–16years). We had one death due to unrelated causes, one progression to Myeloma treated with adjuvant chemotherapy, two revisions and one dislocation which was reduced by open method. The cumulative overall survival for all patients was 91% at 5 years. The cumulative risk of failure of reconstruction including; infection, dislocation, local recurrence/progression to Myeloma was 27% at 5 years. Conclusion: Literature review shows that nearly 53% of SBP progress despite radiotherapy to Myeloma at a median time of 1.8 years (2–4 years). But despite average follow up of 5.45 years, progression to Myeloma after endoprosthetic replacement at our unit is 9.09%. We concluded that the use of endoprostheses for reconstruction after excision of solitary bone plasmacytomas threatening structural integrity of bone combined with radiotherapy decreases the disease progression to Myeloma than radiotherapy alone and offers a reasonable but not absolute chance of cure

We report the use of contained impacted morsellized allograft to revise an aseptically loose, massive distal femoral endoprosthetic replacement in a 27-year old Caucasian lady. The prosthesis was inserted 4 years earlier, following neo-adjuvant chemotherapy and resection of a distal femoral high grade osteosarcoma. Impaction grafting was used to restore bone stock and maintain femoral length. The patient remains disease-free, with excellent function, at two years after revision with no evidence of loosening and maintenance of bone stock. This is the first time this technique has been used in revision of a distal femoral endoprosthetic replacement

Reconstruction of the shoulder joint following resection of the proximal humerus for bone tumours remains controversial. We report the long term functional results of the simplest form of reconstruction – an endoprosthesis. One hundred patients underwent endoprosthetic replacement of the proximal humerus between 1976 and 1998. Thirty eight had osteosarcoma, 17 had chondrosarcoma, 16 had metastases and 9 had Ewing’s sarcoma. Mean age was 36 years (range 10 to 80 yrs). Survivorship of patients and prostheses were calculated. Function was assessed using the Musculoskeletal tumour society (MSTS) and Toronto extremity salvage (TESS) scoring systems. Thirty patients could come to the clinics for MSTS scoring and 38 out of 49 alive patients replied to the TESS questionnaires sent out to them. The overall survival of the patients was 42% at 10 years. Local recurrence (LR) arose in 16 patients, being most common in chondrosarcoma (26%) and osteosarcoma (22%) and arose in 50% of patients with these tumours who had marginal excisions. Of these 16 patients, 8 had forequarter amputations whilst the remainder had excisions and radiotherapy. Mean time to LR was 12 months and all but two of these 16 patients subsequently died within a mean of 18 months. The prostheses proved reliable and dependable. Only 9 required further surgery of any sort, 2 needing minor surgery to correct subluxation and 7 needing revisions, one for infection after radiotherapy and six for loosening – three after trauma. The survivorship of the prosthesis without any further surgery was 86. 5% at 20years. The survivorship of the limb without amputation was 93% at 20 years. The functional outcome was very predictable. Most patients had only 45 degrees of abduction although three patients had normal movements. The mean MSTS functional score was 79% and the mean TESS score was also 79%. There was a high level of patient satisfaction but difficulty was encountered especially in lifting and in all activities above shoulder height. Endoprosthetic replacement of the proximal humerus is a predictable procedure providing reasonable function of the arm below shoulder height. The endoprostheses have proved highly dependable with a low re-operation rate. There is a high risk of local recurrence after inadequate surgery which should be avoided if possible

Introduction: Total femoral endoprosthetic replacement can be used as an alternative to hip disarticulation following extensive tumour excision or in cases of more severe bone loss. To date there have been no long term studies on the oncological and functional outcome of patients who have had this procedure for malignant bone disease. We report our experience of over 25 years employing this procedure using a custom-made and modular total femoral endoprosthetic replacement. Methods: This is a retrospective, single centre study of 27 patients who underwent consecutive total femoral replacement as a primary procedure between 1978 and 2005. Information was collected from the bone tumour database, medical records and clinic review. Outcome was assessed using the Musculoskeletal Tumour Society (MSTS) rating score, the Harris Hip Score (HHS) and the Oxford Knee Score (OKS). Results: There were 15 males and 12 females, with a mean age of 30 years (5 to 65). The overall mean follow-up was 4.3 years (1 to 16.4) for all patients, 9.1 years (1 to 16.4) for the 7 patients who were alive at the time of this review, and 2.6 years (1 to 13) for the 20 patients who had died. 24 patients had primary malignant bone tumours of the femur and 3 had metastatic disease from a known primary elsewhere. 3 patients developed local recurrence, 1 patient developed new lung metastases. Mean MSTS score was 63% (19/30), mean HHS was 68/100 and mean OKS was 34/48. Discussion: Total femoral replacement can be an effective alternative to hip disarticulation in patients with malignant bone disease. Good functional outcomes can be achieved without compromising survival

Introduction: Although originally designed to aid the management of primary malignant bone tumours, the indications for modular endoprosthetic replacement (EPR) have expanded to include complex periprosthetic fractures and failed internal fixation. The objective of this study was to evaluate the success of endoprosthetic replacement (EPR) in patients who had undergone limb salvage following complex trauma presentations. Materials and Methods: Between 2003 and 2008 twenty one patients presented with complex trauma related problems and underwent EPR at a specialist tertiary referral centre. The mean age was 71 years (range 44–87) and the median number of previous surgical procedures was 3 (range 0–11). Eight patients presented following failed internal fixation of proximal femoral fractures. Nine patients had periprosthetic fractures around joint arthroplasties, seven relating to total knee replacements (TKRs) and two to total hip replacements (THRs). One case of periprosthetic fracture around THR had undergone failed internal fixation. Two patients had distal femoral fractures, of which one was infected and had undergone failed internal fixation, while the other was unreconstruc-table. Two patients had proximal tibia fractures which had both undergone failed internal fixation. Results: The mean Harris Hip Score was 89.5 (range 64–85) at a mean follow up period of 8 months (minimum 4 months). The mean American Knee Society Score was 82 (range 62–100) and the mean functional score was 62 (range 30–75) at a mean follow up period of 6 months (minimum 2 months). Complications included two cases of deep infection; one resulted in a two stage revision procedure, while the other retained the EPR following a washout. Conclusion: Modular EPR in the lower limb is a durable reconstructive option in complex trauma problems, particularly in the elderly and those patients with significant bone loss. Preliminary functional results indicate very satisfactory results

Aim. A case series with functional and radiographic outcomes, of modular endoprosthetic distal femoral replacement in complex cases of periprosthetic fracture. Method. Sixteen cases were identified of endoprosthetic replacement (EPR) from the bone and soft tissue cancer implant registry. A retrospective review was undertaken. Results. There were 11 periprosthetic fractures of total knee arthroplasty, 3 revision arthroplasty cases, and 3 cases of distal femoral fracture. Of which four were complicated by infection. AKSS scores ranged from 62-100, average 82, with 6 month minimum follow up. There were two post operative infections, both successfully treated. One femoral component required exchange for aseptic loosening at two years. Conclusion. EPR is an effective surgical procedure for complex cases with a demonstrable good functional outcome

The distal humerus represents 1% of all primary bone tumours. Endoprosthetic replacement can potentially improve function and provide good pain relief. We present out experience with the custom made Stanmore elbow endoprosthesis used after resection of malignant tumours of the distal humerus. Between 1970–2009 we carried out 19 endoprosthetic replacments for malignant tumours of the distal humerus. 10 were a result of metastasis and 9 were primary bone tumours. 7 patients had a pathological fracture as their first presentation and 3 had pathological fractures after the diagnosis was made. 11 patients died between 3 months to 16 year following surgery. The mean survival of the patient group was 7.1 years (range 3 months to 37 years). 4 patients underwent a revision EPR and one patient underwent two revision EPR's due to loosening. Two patients underwent maintenance procedures (rebushing) due to wear of the poly bushing. We have had no revisions since the design of hte implant was changed to a floppy hinge design. One patient underwent an above elbow amputation four years after surgery due to local recurrence. There were no early post operative infections. One patient developed a sinus requiring multiple wound explorations, one year after insertion of the endoprosthesis for a sarcoma. This patient was infection free till the time of death 3 years later. There were no nerve palsies, periprosthetic fractures or wound problems. The mean TES score was 72% (59–78%) in the surviving patients at review. As the majority of the patients were implanted for metastatic disease the initial reliablity and low complication rate of the procedure, in our series, confirms that this is a suitable reconstruction for patients in significant metastatic pain from a destructive lesion of the distal humerus, rapidly restoring function and relieving pain in a predictable manner

Endoprosthetic replacement (EPR) following Bone Tumour excision is common. A major complication of EPRs is infection, which can have disastrous consequences. This paper investigates the cause of infection, management and sequelae. Over 10, 000 patients have been treated in our unit over 34 years. Information collected prospectively on a database includes demographic data, diagnosis, treatment (including adjuvant), complications, and outcomes. Data was analysed to identify any infection in EPRs, its management and outcome. Factors such as operating time, blood loss, adjuvant therapy, type of prosthesis (extendable or standard) were investigated. Outcomes of treatment options were evaluated. Data was analysed on 1265 patients undergoing EPR over 34 years, giving a total follow up time of over 6500 patient years. 137 (10.8%) patients have been diagnosed with deep infection (defined by a positive culture [n=128] or a clinically infected prosthesis with pus in the EPR cavity [n=9]). Of these 49 (34%) required amputations for uncontrollable infection. The commonest organisms were Coagulase Negative Staphylococcus, Staphylococcus aureus and Group D Streptococci. The only satisfactory limb salvaging operation was 2 stage revision, which had 71% success in curing infection. Systemic antibiotics, antibiotic cement or beads and surgical debridement had little chance of curing infection. Infection rates were highest in the Tibial (23.1%) & Pelvic (22.9%) EPRs (p< 0.0001). Patients who had pre or post-operative radiotherapy had significantly higher rates of infection (p< 0.0001), as did patients with extendable EPRs (p=0.007). Patients who had subsequently undergone patella resurfacing and rebushing also had a higher rate of infection (p=0.019 and p=0.052). Infection is a serious complication of EPRs. Treatment is difficult and prolonged. 2 stage revision is the only reliable method for limb salvage following deep infection. Prevention must be the key to reducing the incidence of this serious complication

Purpose; To show that Distal Femoral Endoprosthetic Replacement for metastatic disease can be performed with relatively few complications and allows good pain control and mobilisation for otherwise severely compromised patients. Method; This is a retrospective study, using the oncology database, patient records and local correspondence, looking at 23 patients with distal femoral metastases who had limb salvage with a Distal Femoral Endoprosthesis (DF EPR). Results; There were 10 males (43%) and 13 females (57%), mean age 65 (38–84). 13 (57%) had Renal, 6 (26%) Breast and 5 other primaries identified. Five had additional metastases. 8 (35%) had pathological fractures. The mean time for diagnosis of mets was 67 months ranging from 0 (i.e. at the time of primary tumour) to 30 years since the original diagnosis. 15 patients had surgery alone. 3 patients were lost to follow up. 15 patients have diseased at a mean of 26 months (4–58) post op. There was one intra-op and four post-op complications. The majority of the patients were satisfied post op with regards to pain and mobility. The generally unfavourable prognosis and perceived risks have led surgeons to palliate, stabilise in situ or amputate for distal femoral metastases despite recognised morbidity and life style restrictions. We conclude that DF EPR should be considered as a limb salvage option in patients with distal femoral mets

Aims

The proximal tibia (PT) is the anatomical site most frequently affected by primary bone tumours after the distal femur. Reconstruction of the PT remains challenging because of the poor soft-tissue cover and the need to reconstruct the extensor mechanism. Reconstructive techniques include implantation of massive endoprosthesis (megaprosthesis), osteoarticular allografts (OAs), or allograft-prosthesis composites (APCs).

We have investigated whether improvements in design have altered the outcome for patients undergoing endoprosthetic replacement of the distal femur following tumour resection. Survival of the implant and ‘servicing’ procedures have been documented using a prospective database and review of the implant design records and case records. A total of 335 patients underwent a distal femoral replacement with 162 having a fixed hinge design and 173 a rotating hinge with most of the latter group having a hydroxyapatite collar at the bone prosthesis junction. The median age of the patients was 24 years (range 13-82 yrs). With a minimum follow up of 5 years and a maximum of 30 years, 192 patients remain alive with a median follow-up of 11 years. The risk of revision for any reason was 17% at 5 years, 34% at 10 years and 58% at 20 years. One in ten patients developed an infection and 42% of these patients eventually required an amputation. Aseptic loosening was the most common reason for revision in the fixed hinge knees whilst infection and stem fracture were the most common reason in the rotating hinges. The risk of revision for aseptic loosening in the fixed hinges was 32% at ten years compared with nil for the rotating hinge knees with a hydroxyapatite collar. The overall risk of revision for any reason was halved by use of the rotating hinge, and for patients older than 40 years at time of implant. Conclusion. Improvements in design of distal femoral replacements have significantly decreased the risk of revision surgery. Infection remains a serious problem for these patients

Although originally designed to aid the management of primary malignant bone tumours, the indications for modular endoprosthetic replacement (EPR) have expanded to include complex periprosthetic fractures and failed internal fixation. The incidence of these challenging cases is increasing with an aged population. We reviewed retrospectively our experience with the use of EPR in patients who had undergone limb salvage following complex trauma presentations. Between 2003 and 2008 twenty one patients underwent EPR following referral to the Oxford Sarcoma Service following lower limb trauma. The average age was 71 years (44–87). The average number of previous surgical procedures was 3 (range 0–11). The mean Harris Hip Score was 89.5 (range 64–85). The mean American Knee Society Score was 82 (range 62–100) and the mean functional score was 62 (range 30–75). Complications included two cases of deep infection; one resulted in a two stage revision procedure, while the other retained the EPR following a washout. EPR is an effective salvage procedure for failed trauma fixation and periprosthetic fractures. Immediate weight bearing and a good functional outcome can be expected in this difficult group of patients

Purpose: Function of the extremity assessment in children and adolescents treated with endoprostheses for bone sarcomas. Method: We studied the results of the endoprosthetic replacements in 26 patients 5–17 years old (med-12,8) with malignant primary tumors: osteosarcoma (20), Ewing sarcoma (2), chondrosarcoma (3), rhabdomyosarcoma with bone affection (1). The surgeries were provided in 2004–2008 years for the joints: knee (19 – femur (10), tibia (9)), coxofemoral (2), humeral (4), elbow (1). We used non-expandable endoprostheses in 10 patients 13–17 years (med -15,3) and expandable ones in 16 patients 5–15 years (med-1,1): PROSPON (10), MUTARS (14) and REPIPHYSIS (2). Invasive lengthening was held for PROSPON (8 procedures in 5 patients) and noninvasisve for MUTARS and REPIPHYSIS (8 patients). All the patients underwent protocol therapy. The term of observation was 0,5–4,5 years (med-2,1). For low extremity good function was assessed as the ability of walking with ease, equal length of two legs and sufficient artificial joint’s mobility. For upper extremity good function was assessed as the ability of using an arm freely in daily life (including writing and typing), equal length of two arms and sufficient artificial joint’s mobility. Results: 18 patients (69,2%) are alive. Local relapse had place in 1 (3,9%) case. Good function of an extremity was registered in 14 (73,7%) patients who survived. The best results we saw in noninvasive maintaining equal limb length. Conclusion: Endoprosthetic replacement in a complex with protocol therapy secures good function of an extremity in children and adolescents with malignant primary bone sarcomas

We have investigated whether improvements in design have altered outcome for patients undergoing endoprosthetic replacement of the distal femur following tumour resection. Survival of the implant and ‘servicing’ procedures has been documented using a prospective database and review of the implant design records and case records. A total of 335 patients underwent a distal femoral replacement with 162 having a fixed hinge design and 173 a rotating hinge. The median age of the patients was 24 years (range 13–82yrs). With a minimum follow up of 5 years and a maximum of 30 years, 192 patients remain alive with a median follow up of 11 years. The risk of revision for any reason was 17% at 5 years, 34% at 10 years and 58% at 20 years. Aseptic loosening was the most common reason for revision in the fixed hinge knees whilst infection and stem fracture were the most common reason in the rotating hinges. The risk of revision for aseptic loosening in the fixed hinges was 32% at ten years compared with 4% for rotating hinge knees with a hydroxyapatite collar. The overall risk of revision for any reason was halved by use of the rotating hinge. Conclusion: Improvements in design of distal femoral replacements have significantly decreased the risk of revision surgery. Infection remains a serious problem for these patients

There is very limited literature available on the use of prosthetic replacement in the treatment of primary and secondary tumours of the radius. In the past these were treated with vascularised and non-vascularised autografts which had associated donor site morbidity, problems of non union, graft or junctional fractures and delayed return to function. Our study is a mid to long term follow-up of implant survivorship and the functional outcome of metal prosthetic replacement used for primary and metastatic lesions of radius. We had 15 patients (8 males:7 females) with a mean age of 53 years. 8 patients underwent proximal radial replacement, 2 with mid-shaft radial replacement and 6 patients had distal radial replacements with wrist arthrodesis. The indications for replacement included metastatic lesions from renal cell carcinoma, primary giant cell tumours, ewings' sarcoma, chondroblastoma, radio-ulnar synostosis and benign fibrous histiocytoma. The average follow up was 5 years and 6 months (range 3 months - 18 years). Four patients died as a result of dissemination of renal cell carcinoma and two patients were lost to follow-up. There were no complications with the prosthesis or infection. Clinically and radiographically there was no loosening demonstrated at 18 years with secure fixation of implants. Two patients developed interossoeus nerve palsies which partially recovered. Functional outcomes of the elbow were assessed using the Mayo performance score with patients achieving a mean score of 85 postoperatively (range 65-95). All but one patient had full range of motion of the elbow. The patient with radio-ulnar synostosis had a 25 degree fixed flexion pot-operatively. Although the distal radial replacements had decreased range of movements of the wrist due to arthrodesis, they had excellent functional outcomes. Only one patient required revision surgery due to post-traumatic loosening of the implant. Our results of the use of endoprosthetic replacement of radius in the treatment of tumours are encouraging with regards to survivorship of the implant and functional outcome. This type of treatment results in an early return to daily routine activties, good functional outcome and patient satisfaction

Proximal humerus is the common site for primary bone malignancies that surgical treatment consists of wide excision of the tumor and reconstruction with tumor resection prosthesis or allograft. The ultimate function of the shoulder depends on the degree of sacrification of adjacent structures. Thirty-two patients with primary malignancies have been treated by wide excision and endoprosthetic replacement by senior author between 1989–2005 12 patients were female, 20 patients were male, mean age was 26,6 years (range 7–69 years). Histological diagnosis was 14 osteosarcoma, 4 Ewing’s sarcoma, 4 chondrosarcoma, 3 parosteal sarcoma, 4 giant cell tumor, 1 aneurysmal bone cyst, 2 synovial sarcoma. Synovial sarcoma, osteosarcoma and Ewing’s sarcoma patients received neoadjuvant chemotherapy prior to excision. Mean follow-up was 50,4 months (range 6–153 months). Oncologic results were 20 patients NED (no evidence of disease), 2 patients AWD (alive with disease), 10 patients DOD (died of disease). Functional outcome was scored according to Musculo-Skeletal System Tumor Society (MSTS) rating scale, 7 patients were excellent, 22 patients were good and 3 patients were poor. Regarding complications 2 patients developed local recurrence, 2 patients had superficial infection. Infected cases were treated by systemic antibiotic treatment. All patients had dexterity of the hand and elbow. Regarding shoulder abduction and forward flexion, 7 patients whose deltoid muscle and axillary nerve could be spared got nearly normal shoulder function but even the patients with loss of deltoid had limited abduction owing to elevation of scapula by shrugging. Elongation of the newly formed shoulder capsule was seen in patients that artificial mesh augmentation was not used. Prolene mesh was used to create a new substitute instead of resected shoulder joint capsule. These patients did not show any elongation at long-term follow-up. All arthroplasties was hemi-type without glenoid reconstruction. Hemiarthroplasty by a modular tumor resection prosthesis system after wide excision of proximal humerus seems to be an effective method of treatment after shoulder malignancies. The main determinant of the function is the status of deltoid axillary nerve and rotator cuff but the patients deprived of structures had a functional upper limb with a good command of the elbow and the hand

Introduction: Limb preserving surgery in children with bone sarcoma remains a significant challenge as most are expected to survive their disease and put significant functional loads on their reconstructed limbs. The most common reconstructions used for children with lower limb sarcomas are endoprosthetic replacements and rotationplasty. This study aimed to investigate and compare differences in the complications and functional outcomes between these two methods of reconstruction. Methods: This is a retrospective case control study of 12 rotationplasty patients and 12 patients who received EPR. Patients were selected at random from records provided by both centres and matched according to age at diagnosis, sex, site of disease and date of surgery. The Musculoskeletal Tumour Society (MSTS) score was used to evaluate functional outcome, and surgical complications were assessed qualitatively. Results: Five patients (42%) treated with endoprostheses experienced some form of post-operative surgical complication compared to three patients (25%) treated with rotationplasty and one patient from each group required an amputation to treat the complications. The average MSTS score was 22.7 in the EPR cohort and 18.9 in rotationplasty patients. This difference was statistically significant (p=0.05). Discussion: The study showed that patients who received EPR suffered more surgical complications than rotationplasty patients. However the results demonstrated superior functional outcomes in patients who received EPR. These results suggest that the functional benefit historically attributed to rotationplasty has been negated by modern endoprostheses, probably due to improvements in surgical experience and prosthesis technology. Conclusion: Our experience shows that patients with EPR are more likely to suffer more surgical complications but have similar, if not better functional outcomes compared to rotationplasty

Aim. To compare the functional outcome of proximal femoral reconstruction using endoprosthetic replacement and hip arthrodesis using a vascularised fibular graft. Material and Methods. The study included thirty-five patients who had proximal femoral reconstruction following resection of a malignant bone tumour. Patients were divided into 2 groups according to the reconstructive modality used. Group 1 (15 patients) reconstructed by hip arthrodesis using a vascularised fibular graft. Group 2 (20 patients) reconstructed by endoprosthesis. The mean age of group I was 14.9 years (range, 7-25). 8 patients had Ewing's sarcoma, 5 osteogenic sarcoma, and 2 chondrosarcoma. In group 2, the mean age was 35 years (range, 14-61). Eight patients had osteogenic sarcoma, 2 chondrosarcoma, 2 Ewing's sarcoma, 1 lymphoma, 1 MFH, 1 synovial sarcoma, 1 parosteal osteosarcoma, and 4 metastatic carcinomas. Results. In group 1 failure of the fixation occurred in two patients, and deep infection developed in one patient. These patients were managed with revision of internal fixation and debridement respectively. The mean MSTS functional score was 87% (range 70 – 96%) at the time of the latest follow-up (mean = 64 months). The average limb length discrepancy was 2 cm (range 1 to 4). In group 2, two patients developed deep infection, one patient had a dislocation, and one had loosening of the implant with a re-operation rate of 20%. After a mean follow up of 49.1 months, the mean MSTS functional score was 79% (range 60 – 93%). Conclusion. The functional outcome of hip arthrodesis using a vascularized fibular graft is comparable to endoprosthetic replacement after proximal femoral resections. It should be considered as a durable reconstructive modality in children and young active patients with long life expectancy