INTRODUCTION. Limb salvage surgery is a common treatment for patients who suffer from bone tumors. In the case of pelvic tumors this creates a challenge for the surgeon and the treatment remains controversial because the oncologic complications like local recurrence, dissemination and orthopaedic ones, like infection, haemorrhage, and mechanical problems of reconstructions Tumors affecting the acetabulum are a challenge for the surgeon because of the impact in the function of the extremity. There are many reconstruction techniques described in the literature like prosthesis, allograft systems, arthrodesis, etc…, but still there is not a gold standard due to the poor functional results at long term follow up, and the associated complications of all techniques. In this study we show the experience in our center on pelvic reconstructions after tumors affecting the acetabulum area (zone II). MATERIAL AND METHODS. We surgically treated 81 pelvic tumors from 1997 to 2009 following the Enneking and Dunham calssification attending to the localization of the tumor: Zone I 38 (iliac bone)Zone II 25 (acetabulum)Zone III 18 (pelvic branches)In zone II tumors we performed pelvic reconstruction in eight cases, with different type of prosthesis. In 5 cases we performed saddle prosthesis (group A) and in 3 cases we performed Coned-Stanmore Implants type prosthesis with sacro-iliac anchorage. The mean follow up of the serie was 3,5 years (1–6 years). In group A the mean follow up was 5 years and in group A and in group B the mean follow up was 1 year due to the recent implantation in our center of Coned type prosthesis for pelvic reconstruction. We evaluated our results with these two types of prosthesis. RESULTS. Oncologic: group A we had a local recurrence of 25% and 25% of the patients died. group B we had no cases of local or systemic recurrence and we didn't registered any death. Functional: In group A the patients showed local pain and difficulty to walk probably due to the change of the center of rotation of the hip and instability of the saddle prosthesis. In group B all patient's followed physical therapy programs without problems and were able to walk with crutches ten months after surgery. Complications:group A we had a 25% of perioperative infection and a 25% of dislocation of the prosthesis. In group B we did not have any of these complications. CONCLUSIONS. Saddle prosthesis mantain the length of the extremity and allow weight bearing but they do not give a good stability. Even if we only have one year follow up with this Coned prosthesis with sacro iliac anchorage we achieved much better functional results and a lower rate of complications

The reconstruction of peri-acetabular defects after severe bone loss or pelvic resection for tumor is among the most challenging surgical intervention. The Lumic® prosthesis (Implantcast, Buxtehude, Germany) was first introduced in 2008 in an effort to reduce the mechanical complications encountered with the classic peri-acetabular reconstruction techniques and to improve functional outcomes. Few have evaluated the results associated with the use of this recent implant.

A retrospective study from five Orthopedic Oncology Canadian centers was conducted. Every patient in whom a Lumic® endoprosthesis was used for reconstruction after peri-acetabular resection or severe bone loss with a minimal follow-up of three months was included. The charts were reviewed and data concerning patients’ demographics, peri-operative characteristics and post-operative complications was collected. Surgical and functional outcomes were also assessed.

Sixteen patients, 11 males and five females, were included and were followed for 28 months [3 – 60]. Mean age was 55 [17–86], and mean BMI reached 28 [19.6 – 44]. Twelve patients (75%) had a Lumic® after a resection of a primary sarcoma, two following pelvic metastasis, one for a benign tumor and one after a comminuted acetabular fracture with bone loss. Twelve patients (75%) had their surgery performed in one stage whereas four had a planned two-stage procedure. Mean surgical time was 555 minutes [173-1230] and blood loss averaged 2100 mL [500-5000]. MSTS score mean was 60.3 preoperatively [37.1 – 97] and 54.3 postoperatively [17.1-88.6]. Five patients (31.3%) had a cemented Lumic® stem. All patients got the dual mobility bearing, and 10 patients (62.5%) had the largest acetabular cup implanted (60 mm). In seven of these 10 patients the silver coated implant was used to minimize risk of infection. Five patients (31.3%) underwent capsular reconstruction using a synthetic fabric aiming to reduce the dislocation risk. Five patients had per-operative complications (31.3%), four were minor and one was serious (comminuted iliac bone fracture requiring internal fixation). Four patients dislocated within a month post-operatively and one additional patient sustained a dislocation one year post-operatively. Eight patients (50%) had a post-operative surgical site infection. All four patients who had a two-stage surgery had an infection. Ten patients (62.5%) needed a reoperation (two for fabric insertion, five for wash-outs, and three for implant exchange/removal). One patient (6.3%) had a septic loosening three years after surgery. At the time of data collection, 13 patients (81.3%) were alive with nine free of disease. Silver coating was not found to reduce infection risk (p=0.2) and capsuloplasty did not prevent dislocation (p=1).

These results are comparable to the sparse data published. Lumic® endoprosthesis is therefore shown to provide good functional outcomes and low rates of loosening on short to medium term follow-up. Infection and dislocation are common complications but we were unable to show benefits of capsuloplasty and of the use of silver coated implants. Larger series and longer follow-ups are needed.

The reconstruction of peri-acetabular defects after severe bone loss or pelvic resection for tumor is among the most challenging surgical intervention. The Lumic® prosthesis (Implantcast, Buxtehude, Germany) was first introduced in 2008 in an effort to reduce the mechanical complications encountered with the classic peri-acetabular reconstruction techniques and to improve functional outcomes. Few have evaluated the results associated with the use of this recent implant.

A retrospective study from five Orthopedic Oncology Canadian centers was conducted. Every patient in whom a Lumic® endoprosthesis was used for reconstruction after peri-acetabular resection or severe bone loss with a minimal follow-up of three months was included. The charts were reviewed and data concerning patients’ demographics, peri-operative characteristics and post-operative complications was collected. Surgical and functional outcomes were also assessed.

Sixteen patients, 11 males and five females, were included and were followed for 28 months [3 – 60]. Mean age was 55 [17-86], and mean BMI reached 28 [19.6 – 44]. Twelve patients (75%) had a Lumic® after a resection of a primary sarcoma, two following pelvic metastasis, one for a benign tumor and one after a comminuted acetabular fracture with bone loss. Twelve patients (75%) had their surgery performed in one stage whereas four had a planned two-stage procedure. Mean surgical time was 555 minutes [173-1230] and blood loss averaged 2100 mL [500-5000]. MSTS score mean was 60.3 preoperatively [37.1 – 97] and 54.3 postoperatively [17.1-88.6]. Five patients (31.3%) had a cemented Lumic® stem. All patients got the dual mobility bearing, and 10 patients (62.5%) had the largest acetabular cup implanted (60 mm). In seven of these 10 patients the silver coated implant was used to minimize risk of infection. Five patients (31.3%) underwent capsular reconstruction using a synthetic fabric aiming to reduce the dislocation risk. Five patients had per-operative complications (31.3%), four were minor and one was serious (comminuted iliac bone fracture requiring internal fixation). Four patients dislocated within a month post-operatively and one additional patient sustained a dislocation one year post-operatively. Eight patients (50%) had a post-operative surgical site infection. All four patients who had a two-stage surgery had an infection. Ten patients (62.5%) needed a reoperation (two for fabric insertion, five for wash-outs, and three for implant exchange/removal). One patient (6.3%) had a septic loosening three years after surgery. At the time of data collection, 13 patients (81.3%) were alive with nine free of disease. Silver coating was not found to reduce infection risk (p=0.2) and capsuloplasty did not prevent dislocation (p=1).

These results are comparable to the sparse data published. Lumic® endoprosthesis is therefore shown to provide good functional outcomes and low rates of loosening on short to medium term follow-up. Infection and dislocation are common complications but we were unable to show benefits of capsuloplasty and of the use of silver coated implants. Larger series and longer follow-ups are needed.

Presentation of two cases of pelvic periacetabular sarcoma, which were treated with wide resection of the tumor, pelvic reconstruction and lower limb salvage. Two patients, one male 23 y.o. with chondrosarcoma and one female 75 y.o. with chondroblastic osteosarcoma, were treated in our clinic. Both tumors were stage II according to Enneking’s classification. Both tumors were treated with Enneking type II internal hemipelvectomy due to their periacetabular localization. After wide resection of tumors, pelvic deficit was reconstructed with allograft, which was internally fixated, and total hip replacement with constrained prosthesis. Clinical evaluation showed absence of pain and satisfactory function of the limb. Imaging evaluation with x-ray, 3D-scan kai MRI showed satisfactory position and condition of allograft and internal fixation without evidence of loosening. Non weight bearing mobilization commenced 3 weeks postoperatively. Internal hemipelvectomy requires precise preoperative planning and surgical knowledge because it is technically demanding due to complex structure of the pelvis, the great number of muscular attachments and the presence of important vessels, nerves and pelvic viscera. Wide pelvic resection and reconstruction with allograft for periacetabular sarcomas is a challenging procedure, which offers the opportunity of limb salvage associated with functional outcome

Introduction: Pelvic and acetabular reconstruction following tumor resections are often difficult and fraught with complications. This is the first report of a reconstruction utilizing sacral implantation of an acetabular component, a relatively simple procedure.

Materials and Methods: A 74 year-old man developed recurrent low-grade chondrosarcoma in his ilium. Prior resections had included total hip reconstruction with massive cemented acetabular components. A combined Type I and II internal hemipelvectomy with endoprosthetic reconstruction were performed. Following resection, his sacrum and a small fragment of remaining ilium at the sacroiliac joint was reamed to accept a 48 mm porous coated acetabular component. It was press- fit into place and further secured with two central and three rim screws. A constrained cup liner was used. A proximal femoral endoprosthesis was constructed from a commercially available modular oncology system. Additional resection of the superior and inferior pubic ramie was required to minimize the likelihood of endoprosthetic impingement and leverage-induced dislocation. A soft tissue reconstruction of the abductors was accomplished.

Results: He remains free of recurrence 15 months post-operative. He ambulates full weight bearing with crutches. His leg is neurovascularly intact and he is pleased with his results. A videotape, demonstrating his gait, will be shown

Discussion: The author knows of one similar reconstruction that was performed at another center (unpublished data). That other patient suffered acetabular component dislodgement. The intraoperative leverage-induced dislocation of the hip was the important determination. Pubic rami resection may be required to prevent femoral impingement and instability. The use of multiple fixation screws also improved component fixation.

Conclusion: Placement of a well fixed, constrained, acetab-ular component into a retained sacrum at the level of the SI joint provides an alternative limb salvage technique.

Surgical treatment of pelvic injuries is one of the most challenging tasks in trauma surgery. Intra-operative two-dimensional imaging technology can often not cope with the complex requirements of the three-dimensional anatomy of the pelvis. A registration, which is difficult to achieve with minimal invasive techniques, is obligatory for the CT-based navigation. Changes in the reduction can only be visualized inadequately. The intra-operative imaging after completed osteosynthesis has significantly enhanced since the introduction of three-dimensional image amplifiers. The three-dimensional data can be used directly for the visualization of the osteosynthesis material by linking it to a navigation system.

Since January 2001 the Trauma Center Ludwig-shafen has the ability to perform the registration-free three-dimensional navigation by linking the 3D image intensifier to a navigation system. From January 2002 to January 2005 30 patients with a pelvic injury, where the intra-operative navigation was carried out with the 3D image intensifier, were included in a prospective study. A complete neurological status, conventional fluoroscopic diagnosis, and CT-images were available pre-operatively for all patients. This information formed the basis for the classification and indication for surgery. Patients were positioned on a metal-free carbon table. Due to the registration-free navigation, and thus without the need for a manual registration of landmarks, a tissue-saving preparation could be performed. The postoperative assessment of the implant position was carried out by an independent radiologist.

Screw placement on the pelvic ring was performed in 23 patients (IS lag screws), in 3 patients on both sides. Periacetabular screws were implanted in 7 patients with acetabular fractures. A prerequisite was that the closed repositioning and a temporary fixation could be carried out before the recording of the 3D dataset. 7 surgeons participated in this study. The 3D image intensifier and the navigation system were always operated by the same person. In total 66 screws were implanted (49 IS screws, 17 periacetabular screws). One misplacement of a IS screw with a penetration of the neuroforamen was found during post-operative check-ups. The screw position was corrected during revision surgery. The mean fluoroscopy time for the recording of the 3D scans and the 2D check-ups was 1.78 (+/− 0.4) min. The mean operating time was 105 (+/− 24) min.

This prospective study demonstrated the clinical use of navigation in a three-dimensional dataset from the 3D image intensifier with automatic registration on the pelvis. A relatively high misplacement ratio during IS lag screw placement in the traditional, percutaneous technique according to Matta up to 30% is described in literature. The 3D image intensifier navigation facilitates a standardized working process in the operating room. This is reflected in the low range in fluoroscopy and operating time. The limiting factor in pelvic surgery is the relatively small image volume of the 3D image intensifier of 12 cm3 and the low image quality compared to a CT.

Introduction and aims. After internal hemipelvectomy for malignant pelvic tumors, pelvic reconstruction is necessary for eventual weight bearing and ambulation. Non-vascularised, fibular grafts (NVFG) offer fast, and stable reconstruction, post- modified Enneking's type I and I/IV resection. This study aimed to evaluate the success of graft union and patient function after NVFG reconstruction. Methods. From 1996 to 2009, 10 NVFG pelvic reconstructions were performed after internal hemipelvectomy in four cases of chondrosarcoma, three of Ewing's sarcoma, and single cases of osteosarcoma, malignant peripheral nerve sheath tumour, and malignant fibrous histiocytoma. A key indication for internal hemipelvectomy was sciatic notch preservation confirmed by preoperative MRI. Operation time and complications were recorded. The mean follow-up was 31.1 months (range: 5 to 56), and lower limb function was assessed using the Musculoskeletal Tumour Society scoring system. Plain radiographs and/or computer tomography were used to determine the presence or absence of NVFG union. Results. The mean operation time was four hours and 56 mins, with no major intraoperative complications and partial wound break-down in only one patient. The NVFG united successfully in all patients, with a mean union time of 7.3 months. Post-operative deep infection did not occur in any case. Seven patients were eventually able to ambulate without a cane, and overall, the average function rating percentage was 75.4%. Recurrent tumour occurred in two cases following primary resection. Death from tumour-related disease occurred in one of the ten cases. Conclusions. NVFG is a stable and reliable pelvic reconstruction method after type I and type I/IV hemipelvectomy. Reliability may be linked to preservation of graft periosteum, and careful patient selection, limited to those with an intact sciatic notch. Furthermore, the relatively short operative time required should help minimise deep infection

This study reviews the implantation of extracorporally irradiated autografts as a treatment modality and alternative for pelvic Ewing’s Sarcoma.

We identified 13 cases between 1994 and 2004 (7 male, 6 female), with mean age 14 years (6.5–34.5). The disease free survival was 69% overall, (75% excluding one case initially treated elsewhere) with a mean follow-up of 6.1 years (3.1 – 8.2). Four patients died with distant metastases at a mean time of 17 months (13–23).

Functional results showed a median MST-Score of 86% (IQR 68.5 to 91.5), a median TES-Score 85% (IQR78.5 to 93.5) and a median Harris Hip-Score 89% (IQR 82.5 to 96.5).

Solid bony union was observed at all osteotomy sites. Consolidation was achieved after median 6 months (IQR 5 to 7).

There were three complications (23%) which required operative intervention, one (8%) due to infection, which required removal of the autograft.

Advantages with this technique include ideal fit in the defect and thus promotes healing through greater contact at osteotomy junctions. It avoids early and late loosening and/or breakage of a prosthesis. It acts as a biological bridge for creeping substitution and bony incorporation in the defect. It allows re-attachment of tendons and ligaments, and thus preserves anatomic relationships. There is no risk of disease transmission or immunological reactions. It is cost effective and convenient in any institution with radiotherapeutic equipment.

We conclude this is an appropriate treatment option for localised and resectable pelvic Ewing Sarcoma.

Introduction

As population grows older, and patients receive primary joint replacements at younger age, more and more patients receive a total hip prosthesis nowadays. Ten-year failure rates of revision hip replacements are estimated at 25.6%. The acetabular component is involved in over 58% of those failures. From the second revision on, the pelvic bone stock is significantly reduced and any standard device proves inadequate in the long term [Villanueva et al. 2008]. To deal with these challenges, a custom approach could prove valuable [Deboer et al. 2007].

There has been a substantial increase in the surgical treatment of unstable chest wall injuries recently. While a variety of fixation methods exist, most surgeons have used plate and screw fixation. Rib-specific locking plate systems are available, however evidence supporting their use over less-expensive, conventional plate systems (such as pelvic reconstruction plates) is lacking. We sought to address this by comparing outcomes between locking plates and non-locking plates in a cohort of patients from a prior randomized trial who received surgical stabilization of their unstable chest wall injury. We used data from the surgical group of a previous multi-centred, prospective, randomized controlled trial comparing surgical fixation of acute, unstable chest wall injuries to non-operative management. In this substudy, our primary outcome was hardware-related complications and re-operation. Secondary outcomes included ventilator free days (VFDs) in the first 28 days following injury, length of ICU and hospital stay, and general health outcomes (SF-36 Physical Component Summary (PCS) and Mental Component Summary (MCS) scores). Categorical variables are reported as frequency counts and percentages and the two groups were compared using Fisher's Exact test. Continuous data are reported as median and interquartile range and the two groups were compared using the Wilcoxon rank-sum test. From the original cohort of 207 patients, 108 had been treated surgically and had data available on the type of plate construct used. Fifty-nine patients (55%) had received fixation with non-locking plates (primarily 3.5 or 2.7 mm pelvic reconstruction plates) and 49 (45%) had received fixation with locking plates (primarily rib-specific locking plates). The two groups were similar in regard to baseline and injury characteristics. In the non-locking group, 15% of patients (9/59) had evidence of hardware loosening versus 4% (2/49 patients) in the locking group (p = 0.1). The rate of re-operation for hardware complications was 3% in the non-locking group versus 0% in the locking group (p = 0.5). No patients in either group required revision fixation for loss of reduction or nonunion. There were no differences between the groups with regard to VFDs (26.3 [19.6 – 28] vs. 27.3 [18.3 – 28], p = 0.83), length of ICU stay (6.5 [2.0 – 13.1] vs 4.1 [0 – 11], p = 0.12), length of hospital stay (17 [10 – 32] vs. 17 [10 – 24], p = 0.94) or SF-36 PCS (40.9 [33.6 – 51.0] vs 43.4 [34.1 – 49.6], p = 0.93) or MCS scores (47.8 [36.9 – 57.9] vs 46.9 [40.5 – 57.4], p = 0.95). We found no statistically significant differences in outcomes between patients who received surgical stabilization of their unstable chest wall injury when comparing non-locking plates versus locking plates. However, the rate of hardware loosening was nearly 4 times higher in the non-locking plate group and trended towards statistical significance, although re-operation related to this was less frequent. This finding is not surprising, given the inherent challenges of rib fixation including thin bones, comminution, potential osteopenia and a post-operative environment of constant motion. We believe that the increased cost of locking plate fixation in this setting is likely justifiable given these findings

3D printing techniques have attracted a lot of curiosity in various surgical specialties and the applications of the 3D technology have been explored in many ways including fracture models for education, customized jigs, custom implants, prosthetics etc. Often the 3D printing technology remains underutilized in potential areas due to costs and technological expertise being the perceived barriers. We have applied 3D printing technology for acetabular fracture surgeries with in-house, surgeon made models of mirrored contralateral unaffected acetabulum based on the patients’ trauma CT Scans in 9 patients. The CT Scans are processed to the print with all free-ware modeling software and relatively inexpensive printer by the surgeon and the resulting model is used as a ‘reduced fracture template’ for pre-contouring the standard pelvic reconstruction plates. This allows use of the standard surgical implants, saves time on intra-operative plate contouring, and also aids in reduction to an extent. We share through this presentation the workflow of the freeware softwares to use in order to use this surgical planning and implant preparation that may remove the perceived barriers of cost and technology from surgeons that wish to explore using 3D printing technology for acetabular fracture management and may extend applications to other regions

Custom 3D printed implants can be anatomically designed to assist in complex surgery of the bony pelvis in both orthopaedic oncology and orthopaedic reconstruction surgery. This series includes patients who had major pelvic bone loss after initially presenting with tumours, fractures or infection after previous total hip arthroplasty. The extent of the bone loss in the pelvis was severe and therefore impossible to be reconstructed by conventional ‘off –the-shelve’ implants. The implant was designed considering the remaining bony structures of the contra-lateral hemi- pelvis, to provide an anatomical, secured support for the reconstructed hip joint. The latter was realised by strategically orientated screws and by porous structures (an integral part of the implant), which stimulates osseointegration. A custom pelvic implant was designed, manufactured and 3D printed. Reconstruction of the pelvis was performed together with a cemented (bipolar bearing) acetabular cup. In some cases, a proximal femoral replacement was also necessary to compensate for bony defects. All patients had sufficient range of motion (ROM) at the hip with post-operative stability. It has been verified, at six and twelve months postoperatively, that there is a strong hold of the implant due to osseointegration. Additionally, in patients whose posterior acetabular wall was missing, it was discovered that the implant assisted in bone formation and covered the entire posterior surface of the implant. All patients in this study managed with this novel treatment option, proved to have a stable pelvic reconstruction with restoration of leg lengths, improvement of strength and independent ambulation at short and medium term follow-up

Extracorporeal irradiation of resected bone segments has been used for pelvic reconstruction for 12 years in our unit. The technique allows for a perfect fit, preservation of muscle attachments, and thus, facilitating reconstruction, more rapid osteotomy of autograft bone, low cost, and a low infection rate. Of particular interest is its use in children; revascularisation appears more complete with irradiated autograft, as compared to allograft. There is sparing of adjacent growth plates if the irradiation is given outside the body, whereas external beam radiation would destroy the proximal femoral growth plate—leading to significant leg length discrepancy. Avoiding external beam irradiation also removes any risk of late radiation induced sarcoma and removes the late effects of soft tissue fibrosis due to external beam irradiation. Twenty-seven pelvic reconstructions have been done over a 12-year period, with three failures due to infection and seven due to further disease. Four of these have been for de-differentiated chondrosarcoma of the pelvis, where local recurrence led to failure. In the presence of de-differentiated pelvic chondrosarcoma, we do not recommend this form of reconstruction. Long term functional outcome scores for the first 50 cases completed between August 1996 and June 2003 gave a TESS score of 82% and MSTS score of 78%. This is more than comparable to published series using other forms of reconstruction

Pelvic reconstruction after tumour resection is challenging. Pelvic replacements are usually custom made at considerable expense and then need very careful positioning at the time of surgery. They have a very high rate of complications with up to 30% risk of infection and 10% dislocation. In 2003 we developed a new type of pelvic replacement which would be simple to make, simple to use and which would hopefully avoid the major complications of previous pelvic replacements whist being versatile to use even when there was very little pelvis remaining. The concept is based on the old design of Ring stemmed hip replacement and has become known as the ice-cream cone prosthesis. It is inserted into the remnant of pelvis or sacrum and is surrounded by bone cement containing antibiotics. One of the main advantages is it’s flexibility, allowing insertion after resection at a variety of levels. It is also suitable for patients with metastatic disease. We have inserted 12 of these implants in the past 4 years, resolving very difficult reconstruction problems. There was one case that became infected but was cured with washout and antibiotics. In one patient there was excessive leg lengthening resulting in a sciatic and femoral nerve palsy and the prosthesis had to be revised. All patients can walk with one stick or less. These results are encouraging and suggest that this versatile implant may be the way forward for pelvic reconstruction because of it’s flexibility of use and low complication rate

Purpose. Durable fixation may be difficult to achieve when significant bone loss is present, as it occurs in pelvic sarcoma resection and revision surgery of tumor implants. Purpose of this study was to review clinical results of primary and revision surgery of the pelvis and lower extremity in the setting of severe bone loss following limb salvage procedures for bone sarcoma using modular porous tantalum implants. Method. Retrospective study of 15 patients (nine females, six males) undergoing primary or revision pelvic reconstruction (five patients) or revision surgery of a tumor implant of the hip (five patients), knee (four patients), and ankle (one patient) using porous tantalum implants was undertaken. Reason for the tumor implant was resection of bone sarcoma in 13 cases and tumor-like massive bone loss in the remaining two cases. Cause for revision was aseptic failure (nine patients) or deep infection (six patients); average age at the time of surgery was 31 years (16–61 yrs). Revision was managed in a staged fashion in all the six infected cases. All patients presented severe combined segmental and cavitary bone defects. Bone loss was managed in all patients using porous tantalum implants as augmentation of residual bone stock and associated with a megaprosthesis in eight cases (five proximal femur, two distal femur, one proximal tibia). Average follow-up was 4.5 years for hip/knee implants and 2.5 yrs for pelvic reconstructions (range 1–6.8 yrs). Minimum follow-up of two years was available in 11 cases. Results. Infection recurred in one of the six cases managed for infection, requiring further treatment but allowing retention of the porous tantalum implant. All the patients showed well-fixed and functioning implants at latest follow-up. Conclusion. Porous tantalum has been very successful at early follow-up in patients with severe bone loss following primary and revision tumor-related surgery of the pelvis and lower extremity. Longer follow-up is required to appreciate long-term shortcomings

Aims

Large acetabular bone defects encountered in revision total hip arthroplasty (THA) are challenging to restore. Metal constructs for structural support are combined with bone graft materials for restoration. Autograft is restricted due to limited volume, and allogenic grafts have downsides including cost, availability, and operative processing. Bone graft substitutes (BGS) are an attractive alternative if they can demonstrate positive remodelling. One potential product is a biphasic injectable mixture (Cerament) that combines a fast-resorbing material (calcium sulphate) with the highly osteoconductive material hydroxyapatite. This study reviews the application of this biomaterial in large acetabular defects.

Aims

Custom triflange acetabular components (CTACs) play an important role in reconstructive orthopaedic surgery, particularly in revision total hip arthroplasty (rTHA) and pelvic tumour resection procedures. Accurate CTAC positioning is essential to successful surgical outcomes. While prior studies have explored CTAC positioning in rTHA, research focusing on tumour cases and implant flange positioning precision remains limited. Additionally, the impact of intraoperative navigation on positioning accuracy warrants further investigation. This study assesses CTAC positioning accuracy in tumour resection and rTHA cases, focusing on the differences between preoperative planning and postoperative implant positions.

Aims

Ilium is the most common site of pelvic Ewing’s sarcoma (ES). Resection of the ilium and iliosacral joint causes pelvic disruption. However, the outcomes of resection and reconstruction are not well described. In this study, we report patients’ outcomes after resection of the ilium and iliosacral ES and reconstruction with a tibial strut allograft.

Aims

Posterior column plating through the single anterior approach reduces the morbidity in acetabular fractures that require stabilization of both the columns. The aim of this study is to assess the effectiveness of posterior column plating through the anterior intrapelvic approach (AIP) in the management of acetabular fractures.

Aims

For rare cases when a tumour infiltrates into the hip joint, extra-articular resection is required to obtain a safe margin. Endoprosthetic reconstruction following tumour resection can effectively ensure local control and improve postoperative function. However, maximizing bone preservation without compromising surgical margin remains a challenge for surgeons due to the complexity of the procedure. The purpose of the current study was to report clinical outcomes of patients who underwent extra-articular resection of the hip joint using a custom-made osteotomy guide and 3D-printed endoprosthesis.