Broida, Samuel E

Background: Myxofibrosarcomas are notoriously highly infiltrative soft-tissue sarcomas, making negative surgical margins difficult to obtain. Recently, vacuum-assisted closure (VAC) is used to delay wound closure until a negative margin has been achieved; however, this can delay care and increase costs. Our institution has historically performed single-stage resections with intraoperative frozen margin analysis and reconstruction in these patients. The purpose of this study is to report the outcomes of this technique. Methods: We reviewed 112 patients (62 males, mean age 70 ± 14 years) with superficial myxofibrosarcoma. Eighty-eight patients received preoperative radiation. All patients underwent surgical resection with intraoperative frozen margin analysis, and the planned reconstruction was performed in a single anesthetic. Results: The 10-year local recurrence-free survival was 90%; positive intraoperative frozen section (HR 7.44, p = 0.004) and final permanent margins (HR 8.53, p = 0.007) were associated with local recurrence. Intraoperative margins were negative in 103 (92%) of patients, 1 of which was positive on final permanent section. There were nine cases of microscopically positive margins, of which seven underwent immediate re-excision to a negative margin. The accuracy of frozen margin assessment for myxofibrosarcoma was between 92.92 and 98.23%. All patients underwent reconstruction at the time of resection, with 19% needing an additional procedure, most commonly due to a wound complication (12%). Conclusions: Multidisciplinary single-stage excision with intraoperative frozen margin assessment and soft-tissue reconstruction yields low rates of local recurrence in patients with superficial myxofibrosarcoma.

ABSTRACTBackgroundSkip lesions in bone sarcoma are a poorly described entity. Reports on skip lesions in osteosarcoma and Ewing sarcoma suggest that whole bone MRI should be obtained to evaluate for additional tumor foci given the association with worse outcomes. However, there is limited evidence to support whole bone imaging in chondrosarcoma.MethodsBetween 1995 and 2022, 129 patients with long bone chondrosarcoma were evaluated at our institution. Lesions were located most commonly in the femur in 64 patients and the humerus in 54 patients. All imaging studies and pathology reports were reviewed to determine the presence of skip lesions, defined as an area of histology‐confirmed chondrosarcoma that was separated from the primary lesion by normal bone on pathology.ResultsWhole bone imaging was obtained during initial staging in 107 patients with two‐thirds of patients receiving MRI, CT, or bone scan. Five patients (3.9%) were found to have skip lesions in the same bone as the primary tumor. There were no transarticular skip lesions. Skip lesions were detected in three patients with low grade chondrosarcoma (4.6%) and two patients with high grade chondrosarcoma (3.2%). All lesions were within 2 cm of the primary tumor. All were visible on MRI and CT of the primary site and one was visible on plain radiographs. The presence of skip lesions did not alter the type of surgical treatment in any patients.ConclusionSkip lesions in long bone chondrosarcoma are rare. All skip lesions in this study were in close proximity to the primary tumor and the same grade as the main lesion. Our results suggest that advanced imaging of the whole bone may be of low utility for evaluating the presence of skip lesions. The clinical significance of skip lesions in chondrosarcoma remains unclear, however, their presence did not impact the treatment plan in this series.

ABSTRACTBackgroundGlenohumeral arthrodesis is a demanding surgical procedure. However, it is an option for reconstruction an oncologic resection, especially for patients in whom the axillary nerve is compromised.MethodsWe reviewed 26 (12 male:14 female) glenohumeral arthrodeses (14 primary:12 revision) following an oncologic resection. The most common method of reconstruction was a free vascularized fibula autograft with a bulk allograft (n = 18). The median follow‐up was 22 years (IQR 19 years).ResultsMedian Musculoskeletal Tumor Society Scores and Toronto Extremity Salvage Scores at final follow‐up were 86% and 80%. MSTS scores were similar in patients receiving arthrodesis for primary versus secondary reconstruction. Fifteen (58%) patients had postoperative complications requiring reoperation. Most reoperations occurred with‐in the first 5 years postoperative, with two procedures occurring after 10‐years. Three patients were diagnosed with metastatic disease, one of which also had a local recurrence.ConclusionGlenohumeral arthrodesis provides satisfactory long‐term outcomes for primary and secondary management of shoulder girdle tumors. While early complication rates were high, long‐term complications were rare.

ABSTRACT Background Flat bone chondrosarcomas have worse outcomes than extremity tumors, but there is no data directly comparing the different flat bones. The aim of this study was to examine differences in recurrence and survival between pelvic and scapular chondrosarcoma. Methods One hundred and sixty‐nine (42 scapula, 127 pelvic) patients with chondrosarcoma who underwent surgical resection were reviewed. High‐grade tumors were defined as lesions that were Grade 3 or dedifferentiated on surgical pathology. Results Patients with low‐intermediate grade lesions of the scapula were more likely to have positive margins during definitive surgical management (14% vs. 3%, OR 5, 95% CI [1.15, 22.6], p = 0.02), however, this did not translate to differences in recurrence or survival ( p > 0.05). The presence of an associated soft tissue mass in low‐intermediate grade lesions was not associated with increased recurrence. Among high‐grade tumors, patients with scapular lesions had worse DSS (HR 2.99, 95% CI [1.05, 8.51], p = 0.04). One‐ and 2‐year DSS for high‐grade pelvic tumors was 75% and 57%, respectively, and 50% and 33% for scapular tumors. Conclusion Survival for high‐grade chondrosarcoma of the flat bones is poor, particularly for those of the scapula. Despite a higher rate of positive margins for low‐intermediate grade lesions of the scapula, there was no significant difference in survival compared to low‐intermediate grade lesions of the pelvis. Additional studies with larger sample sizes are needed to further elucidate differences between these locations.

Reconstruction of the abductor mechanism remains a primary challenge with contemporary proximal femoral replacement (PFR) surgery. Previously, techniques such as trochanteric preservation or direct repair to the implant have been described; however, these strategies are limited in their ability to tension the repair and reattach other muscles of the hip girdle. The aim of this study was to evaluate the outcomes of patients undergoing oncologic PFR using a novel technique of mesh augmentation for soft tissue repair. Methods: We reviewed 18 (mean age 64 years; 8 female: 10 male) consecutive patients undergoing PFR with Marlex mesh augmentation between 2018 and 2023 at a single institution. The most common indication was metastatic disease (n = 13). The mean follow-up in the 14 surviving patients was 27 months (range 12–34). Results: All patients were ambulatory at final follow-up. There were no post-operative dislocations, infections, or wound issues. At the final follow-up, the mean total MSTS score was 77%. Conclusion: Mesh augmentation of PFRs allowed for adequate soft tissue tensioning and muscular attachment to the body of the implant. In our series, this technique was durable, with no dislocations and no mesh-related complications. In summary, mesh augmentation of PFRs may be considered during reconstruction for oncologic indications.

Background: Synovial sarcoma is rare and may present as a small, slow-growing mass. These tumors are often mistaken as benign and are therefore prone to unplanned and/or non-oncologic excision. We sought to identify the rate of unplanned excision of synovial sarcoma and risk factors for recurrence and survival among this cohort. Methods: The medical records of 246 patients evaluated at a single institution for synovial sarcoma between 1997 and 2022 were retrospectively reviewed. Of these, 87 (35%) underwent unplanned, non-oncologic excision. The mean age of the cohort was 49 years. Primary tumors were located in the extremity (n = 63), abdomen (n = 6), thorax (n = 7), head/neck (n = 8), and paraspinal region (n = 3). The median maximum pre-treatment dimension of the primary tumor was 4.8 cm (IQR 7–2.4). Seventy-seven (86%) patients underwent re-excision of the tumor bed, 39 (45%) received chemotherapy, and 63 (72%) received radiation therapy. Results: Among patients who underwent unplanned excision, local recurrence-free survival (LRFS) was 98% at 1 year and 82% at 5 years. Metastasis-free survival (MFS) was 91% at 1 year and 72% at 5 years. Disease-specific survival (DSS) was 98% at 1 year and 72% at 5 years. When adjusting for tumor size, tumors which underwent unplanned excision did not have worse recurrence or survival compared to those which had planned excision (p > 0.10). Size > 5 cm, monophasic subtype, and axial location were associated with increased risk of disease recurrence. Forty-six patients had residual tumor following re-excision, which was associated with worse MFS (HR 8.17, 95% CI [1.89, 35.2], p < 0.01) and DSS (HR 7.66, 95% CI [1.76, 33.4], p < 0.01). Patients who received radiotherapy had improved MFS (HR 6.4, 95% CI [1.42, 29.0], p = 0.02) and DSS (HR 5.86, 95% CI [1.27, 26.9], p = 0.02). Conclusions: One-third of patients presenting with synovial sarcoma were diagnosed after unplanned, non-oncologic excision. Patients with large, axial tumors had worse survival. Approximately half of patients who underwent unplanned excision had no residual tumor after pre-operative radiation. The use of radiation was associated with decreased rates of recurrence and improved disease-specific survival. Our results suggest that margin-negative re-resection and radiotherapy should be considered when feasible following unplanned excision of synovial sarcoma.

AimsVenous tumour thrombus (VTT) is a rare finding in osteosarcoma. Despite the high rate of VTT in osteosarcoma of the pelvis, there are very few descriptions of VTT associated with extrapelvic primary osteosarcoma. We therefore sought to describe the prevalence and presenting features of VTT in osteosarcoma of both the pelvis and the limbs.MethodsRecords from a single institution were retrospectively reviewed for 308 patients with osteosarcoma of the pelvis or limb treated between January 2000 and December 2022. Primary lesions were located in an upper limb (n = 40), lower limb (n = 198), or pelvis (n = 70). Preoperative imaging and operative reports were reviewed to identify patients with thrombi in proximity to their primary lesion. Imaging and histopathology were used to determine presence of tumour within the thrombus.ResultsTumours abutted the blood vessels in 131 patients (43%) and encased the vessels in 30 (10%). Any form of venous thrombus was identified in 31 patients (10%). Overall, 21 of these thrombi were determined to be involved with the tumour based on imaging (n = 9) or histopathology (n = 12). The rate of VTT was 25% for pelvic osteosarcoma and 1.7% for limb osteosarcoma. The most common imaging features associated with histopathologically proven VTT were enhancement with contrast (n = 12; 100%), venous enlargement (n = 10; 83%), vessel encasement (n = 8; 66%), and visible intraluminal osteoid matrix (n = 6; 50%). Disease-specific survival (DSS) for patients with VTT was 95% at 12 months (95% CI 0.87 to 1.00), 50% at three years (95% CI 0.31 to 0.80), and 31% at five years (95% CI 0.14 to 0.71). VTT was associated with worse DSS (hazard ratio 2.3 (95% CI 1.11 to 4.84).ConclusionVTT is rare with osteosarcoma and occurs more commonly in the pelvis than the limbs. Imaging features suggestive of VTT include enhancement with contrast, venous dilation, and vessel encasement. VTT portends a worse prognosis for patients with osteosarcoma, with a similar survivability to metastatic disease.Cite this article: Bone Joint J 2024;106-B(8):865–870.

Abstract Background Radiation‐associated soft tissue sarcomas (RA‐STS) are rare complications of patients receiving radiation therapy (RT) and are generally associated with a poor prognosis. Most of the literature surrounding RA‐STS of the chest is centered on angiosarcoma. Therefore, we aim to document the management and outcome of patients with non‐angiosarcoma RA‐STS of the chest. Methods We reviewed 17 patients (all female, median age 65 years) diagnosed with RA‐STS. The most common primary malignancy was breast carcinoma ( n = 15), with a median RT dose of 57.9 Gy. All patients underwent surgical resection; five patients (29%) received radiotherapy; and five patients (29%) received peri‐operative chemotherapy. Results The 5‐year local recurrence and metastatic‐free survival were 61% and 60%, while the 5‐year disease‐specific survival was 53%. Local recurrence was associated with death due to disease (HR 9.06, p = 0.01). Complications occurred in nine of patients, most commonly due to a wound complication ( n = 7). At the most recent follow‐up, the median Musculoskeletal Tumor Society Score was 63%. Conclusion RA‐STS involving the chest wall are aggressive tumors with a high risk of local relapse and death due to disease. Local recurrence was associated with death due to disease; as such, we recommend aggressive surgical management with evaluation for adjuvant therapies.

» The proximal humerus is a common location for primary bone tumors, and the goal of surgical care is to obtain a negative margin resection and subsequent reconstruction of the proximal humerus to allow for shoulder function. » The current evidence supports the use of reverse total shoulder arthroplasty over hemiarthroplasty when reconstructing the proximal humerus after resection of a bone sarcoma if the axillary nerve can be preserved. » There is a lack of high-quality data comparing allograft prosthetic composite (APC) with endoprosthetic reconstruction of the proximal humerus. » Reverse APC should be performed using an allograft with donor rotator cuff to allow for soft-tissue repair of the donor and host rotator cuff, leading to improvements in shoulder motion compared with an endoprosthesis.

AbstractIntroductionThe humerus is a common site of metastases and primary tumors. For some patients with a segmental defect and/or diaphyseal cortical destruction a cemented intercalary device may provide a more reliable construct, however data on their use is limited.MethodsWe reviewed 43 (28 male and 15 female) patients treated with an intercalary humeral spacer at a single tertiary referral center between 1989 and 2022. Humeral lesions were most commonly secondary to metastatic disease (n = 29, 68%), with 25 (58%) patients presenting with a pathologic fracture. Mean age and body mass index were 66 years and 27.9 kg/m2. First generation taper joint device were used in 22 patients and second‐generation lap device in 21 patients.ResultsFollowing reconstruction the 2‐year overall survival was 30%. Mechanical complications occurred in 11 patients, most commonly aseptic loosening (n = 6, 14%). With death as a competing risk, the cumulative incidence of mechanical failure was 28% at 2‐years postoperative. Following the procedure, mean Musculoskeletal Tumor Society scores was 70% and mean shoulder elevation was 87°.ConclusionReconstruction of the humeral diaphysis with an intercalary endoprosthesis provides restoration of function of the upper extremity, however, is associated with one in four patients having mechanical failure.