Hip Arthroplasty Outcomes in Patients with Metastatic Bone Disease.

Background/Objective: The hip is a common location for metastatic bone disease (MBD) and surgical intervention is often indicated to relieve pain and improve function. MBD of the hip is usually treated with hemiarthroplasty or with total hip arthroplasty if there are acetabular lesions. As treatment for metastatic disease evolves and patients may expect to live longer after diagnosis, further evaluation of the complications and functional outcomes associated with hip arthroplasty for MBD are necessary. Methods: This was a retrospective review of patients who underwent hip arthroplasty for MBD at a single institution between 2007 and 2021. Outcomes included rates of reoperation, complications, and overall survival. Results: Ninety-three cases in 91 patients were included. Total hip arthroplasty (THA) was performed in 52 cases (55.9%), hemiarthroplasty in 15 (16.1%), and complex arthroplasty, including proximal femur replacement or THA with complex acetabular reconstruction, was performed in 26 (28%). There were 11 reoperations in five patients and six dislocations. Median survival was 10.4 months and one-year overall survival was 53.3%. There was a significant increase in the proportion of patients who were able to ambulate independently (35.2% vs 17.6%; p=0.02) and a significant decrease in patients confined to a wheelchair (18.7% vs 3.3%; p=0.045) after surgery. Conclusions: Hip arthroplasty for MBD leads to relatively low rates of complications and reoperations in this population known to have high postoperative morbidity and mortality. Hip arthroplasty provides the majority of MBD patients with a durable reconstruction that exceeds their lifespan and enables them to return to an acceptable level of function.

A Rare Location of Osteosarcoma in the Cuboid Bone: A Case Report.

CASE: In this case report, we describe a patient with left foot pain whose magnetic resonance imaging revealed a destructive tumor of the left cuboid bone. A biopsy of the tumor confirmed an osteoblastic osteosarcoma of the cuboid, and the patient was treated with chemotherapy followed by a below-the-knee amputation. CONCLUSION: There are only a handful of cases reporting osteosarcoma of the cuboid bone, and challenges remain in properly diagnosing the lesion to recommend the best course of treatment.

Association between neutrophil-lymphocyte ratio, platelet-lymphocyte ratio, and survival in undifferentiated pleomorphic sarcoma (NLR, PLR, and overall survival in UPS).

BACKGROUND AND OBJECTIVES: Cancer-related inflammation has been shown to be a driver of tumor growth and progression, and there has been a recent focus on identifying markers of the inflammatory tumor microenvironment. Neutrophil-lymphocyte ratio (NLR) and platelet-lymphocyte ratio (PLR) are inflammatory indices that have been identified as prognostic biomarkers in various malignancies. However, there is limited and conflicting data regarding their prognostic value in soft tissue sarcoma (STS) and specifically in undifferentiated pleomorphic sarcoma (UPS). METHODS: This was a retrospective review of patients who underwent surgical treatment for primary UPS from 1993 to 2021. Cutoff values for NLR and PLR were determined by receiver operating curve analysis. Cox proportional hazards regression was used to determine prognostic factors on univariate and multivariate analysis. RESULTS: Eighty-six patients were included. The optimal cutoff value was 3.3 for NLR and 190 for PLR. Both high NLR (HR 2.44; 95% CI 1.29-4.63; p = 0.005) and high PLR (HR 1.99; 95% CI 1.08-3.67, p = 0.02) were associated with worse OS on univariate analysis. On multivariate analysis, metastasis at presentation and radiotherapy were independently predictive of OS, but high NLR (HR 1.30; 95% CI 0.64-2.98; p = 0.41) and high PLR (HR 1.63; 95% CI 0.82-3.25; p = 0.17) were not predictive of survival. CONCLUSIONS: High pre-treatment NLR and PLR were associated with decreased overall survival but were not independent predictors of survival in patients undergoing resection for UPS. Until additional prospective studies can be done, survival outcomes are best predicted using previously established patient- and tumor-specific factors.

Examining patient perspectives on sarcoma surveillance: The Sarcoma Surveillance Survey.

OBJECTIVES: The optimal frequency and modality of sarcoma surveillance imaging are uncertain, and current practices vary substantially. While efforts to develop evidence-based guidelines are ongoing, patient perspectives regarding surveillance imaging have not been reported. The primary goal of this study was to pilot the novel Sarcoma Surveillance Survey to assess patient concerns regarding sarcoma surveillance. METHODS: In this single-center, cross-sectional study, patients receiving surveillance imaging after surgical sarcoma treatment were administered the 10-item Sarcoma Surveillance Survey, the validated Appraisal Scale, measuring positive and negative emotional reactions to imaging, and the Patient-Reported Outcomes Measurement Information System (PROMIS) Anxiety Short Form 8a as a measure of anxiety. RESULTS: Patients expressed highest levels of concern about cost and radiation exposure associated with surveillance, and most (87.6%) did not express a preference for more or less frequent imaging. Younger patients and those living further away from the imaging center were more concerned about cost of surveillance. Female patients had higher levels of concern compared to males regarding radiation, IV contrast, and overall levels of concern about surveillance. Higher levels of anxiety were correlated with preference for more frequent imaging (rs = 0.274, p = 0.027) and higher overall level of concern about surveillance (rs = 0.259, p = 0.037). Higher negative appraisal scores were also correlated with higher overall concerns (rs = 0.323; p = 0.012). CONCLUSIONS: Patient perspectives should be considered when developing sarcoma surveillance strategies. Identifying patients with greater anxiety and concerns regarding imaging may create opportunities for improved surveillance practices as well as counseling and survivorship interventions.

Neoadjuvant radiation influences the pseudocapsule in soft tissue sarcoma: A histopathologic and radiographic evaluation.

BACKGROUND AND OBJECTIVES: A pseudocapsule surrounds soft tissue sarcoma (STS). Its composition, response to neoadjuvant radiation, and clinical significance are poorly understood. METHODS: Seventeen cases of high-grade undifferentiated pleomorphic sarcoma (UPS) were reviewed, ten of which were treated with neoadjuvant radiation. Magnetic resonance imaging (MRI) studies, pathology slides, and patient records were reviewed. RESULTS: Irradiated pseudocapsules were well-demarcated with fewer viable tumor cells and were thicker on both pathology and MRI measurements when compared to non-irradiated pseudocapsules (p < 0.001, p = 0.04, respectively). Pseudocapsule mean pathology width (MPW) was positively correlated with tumor necrosis percentage (p = 0.044), and negatively correlated with mitotic rate (p = 0.043), though pseudocapsule width measured on MRI did not correlate with these prognostic factors. Despite an evident treatment response to neoadjuvant radiation, viable tumor cells were present within the pseudocapsule and the surrounding healthy tissue. CONCLUSIONS: The pseudocapsule in STS responds to radiation and there appears to be a correlation between pseudocapsule width and tumor necrosis and mitotic activity. As viable tumor cells are present beyond the pseudocapsule, surgeons should remain cautious in determining margins of resection in STS when using the pseudocapsule as a palpable landmark. This novel study is the most detailed to date to describe the histopathologic and radiographic characteristics of the STS pseudocapsule. Further studies are needed to determine the clinical significance of the pseudocapsule.

En Bloc Resection of Giant Cell Tumor following Neoadjuvant Denosumab: A Case Report and Review of the Literature.

Introduction: The RANK ligand inhibitor denosumab has been used to treat cases of unresectable giant cell tumors of bone (GCTB) or preoperatively to facilitate intralesional curettage. However, there are no clear guidelines for use of denosumab prior to en bloc resection. Case Presentation: In this study, a 26-year-old patient presented with atraumatic lateral knee pain. X-rays demonstrated a destructive lesion within the proximal fibula, and biopsy confirmed the diagnosis of GCTB. Management and Outcomes: The patient received 3 months of neoadjuvant denosumab with complete resolution of his pain and cortical rim formation surrounding the tumor. The tumor was removed en bloc with negative margins. At 6-month follow-up, the patient had returned to his functional baseline with no evidence of tumor recurrence. Conclusion: Neoadjuvant denosumab can mitigate symptoms related to GCTB and promotes cortical bone formation, facilitating en bloc resection and permitting acceptable functional outcomes in select cases.

Epithelioid hemangioendothelioma of bone: A survival analysis of 50 cases from the SEER database (1992-2016).

Epithelioid hemangioendothelioma (EHE) is a rare vascular tumor that may arise in bone. The purpose of this investigation was to determine the clinicopathological features and outcomes of osseous EHE in a large patient series, and to assess whether survival is impacted by demographics, tumor characteristics, or treatment factors. This was a retrospective review of the Surveillance, Epidemiology and End Results (SEER) database from 1992 to 2016. Kaplan-Meier was used to estimate overall survival (OS) and disease-specific survival (DSS). A Cox regression model was used to identify prognostic factors. Fifty patients from 1992 to 2016 with a median age of 54.5 years (IQR, 37-67) were reviewed. For location, 46% (n = 23) of tumors arose from the appendicular skeleton while 38% (n = 19) occurred within the axial skeleton (overlapping EHE: 16%, n = 8). Of the cases with recorded treatment factors, 54.8% (n = 23) had surgery, 26% (n = 13) received radiation, 22% (n = 11) were treated with chemotherapy, and 26% (n = 13) had surgery plus radiation. The 5-year OS probability was 49.2% (95% CI, 23.6-70.6), and the 5-year DSS probability was 63.9% (95% CI, 33.0-83.5). No surgery (surgery: HR, 0.262; 95% CI, 0.07-0.9); p = 0.041) and age older than 50 years (HR, 4.117; 95% CI, 1.1-15.4; p = 0.035) were negative prognostic factors of disease-specific mortality after controlling for confounding variables. There was no association between disease-specific mortality and adjuvant or multimodal therapy. The prognosis of EHE of bone is less than favorable, and the 5-year DSS probability of 64% emphasizes the intermediate grade nature of this tumor subtype. Surgical treatment, when feasible, is associated with a better prognosis.

Pelvic ring reconstruction with segmental spinal instrumentation after complete type I pelvic resection.

BACKGROUND AND OBJECTIVES: Internal hemipelvectomy is a complex procedure used to treat malignancy that involves the pelvis. Reconstruction of the pelvis after type I or type I/IV resection remains controversial due to high complication rates and debatable functional benefit. Modern reconstruction options may provide a rapid, intuitive, and reliable way to reconstitute the pelvic ring. METHODS: This is a retrospective case series of four patients who underwent a novel reconstruction method involving computer navigation and segmental spinal instrumentation applied to the pelvis after type I or type I/IV pelvic resection for malignancy between 2015 and 2020. RESULTS: Time to ambulation postoperatively ranged from 1 to 7 days, and median length of hospital stay was 8.5 (7.5, 10.5) days. Complications included wound necrosis in two patients that did not require reoperation and wound infection in one patient that required irrigation and debridement. There was no radiographic evidence of hardware loosening or failure on follow-up. Three patients remain alive and two remain disease-free. At most recent follow-up, all patients were able to ambulate and perform activities of daily living. CONCLUSIONS: The technique for pelvic reconstruction described allows for rapid fixation intraoperatively with few complications and satisfactory functional results in this limited series.

Brachial Artery Pseudoaneurysm After Supracondylar Humerus Fracture: A Case Report.

CASE: A 9-year-old boy with a widely displaced Type-III supracondylar humerus fracture presented with a painful mass at the antecubital fossa after pin fixation. Exploration of the mass caused bleeding from a brachial artery pseudoaneurysm that necessitated repair with a saphenous vein graft. Six weeks later, the fracture had healed without complications. CONCLUSION: We describe an unusual presentation of a pediatric supracondylar humerus fracture that highlights the importance of including vascular injury in the differential diagnosis for similar presentations.