Giant-cell-poor giant cell tumor of bone: report of two cases and literature review.

Giant cell tumor of bone (GCTB) is a locally aggressive tumor that shows predilection for the metaphysis/epiphysis of long bones, with an incidence of 4-5% of primary bone tumors. GCTB shows two main populations of cells: mononuclear cells and non-neoplastic multi-nucleated giant cells, with or without fibrous background. On the other hand, giant-cell-poor GCTB are rare with only few reports in the literature. These cases offer a diagnostic challenge, given the absence of giant cells and such cases have consistently been shown to harbor the H3F3A gene mutation by sequencing. The H3.3 G34W mutation-specific monoclonal antibody has shown high specificity in the diagnosis of GCTB. Two cases of giant-cell-poor GCTB are presented in this study, in which giant cells were absent or sparse and the diagnosis of GCTB was confirmed by the expression of H3.3 G34W monoclonal antibody in the mononuclear cells by immunohistochemistry. Whether this represents a histologic variant of GCTB or partial involution of GCTB is not yet fully understood; however, an immune response, infectious/inflammatory reaction, and/or anti-tumor cytokine production have been purported to be factors inciting disease regression in GCTB.

Fifty years of bone tumors.

There have been enormous advances in the treatment of bone tumors over the past half-century. The most notable of these has been the transition from amputation as the standard of care to limb salvage surgery. This transition is the result of advances in imaging techniques, accurate diagnosis, systemic therapies (including chemotherapy), and prosthetic design for the reconstruction of musculoskeletal defects. Advances have also been made in the management of benign and metastatic bone tumors.

What Proportion of Patients With Musculoskeletal Sarcomas Demostrate Symptoms of Depression or Anxiety?

BACKGROUND: It is estimated that the 12-month prevalence of depression in the United States is 8.6%, and for anxiety it is 2.9%. Although prior studies have evaluated depression and anxiety in patients with carcinoma, few have specifically evaluated patients with sarcoma, who often have unique treatment considerations such as mobility changes after surgery. QUESTIONS/PURPOSES: We evaluated patients with sarcoma seen in our orthopaedic oncology clinic to determine (1) the proportion of patients with depression symptoms, symptom severity, how many patients triggered a referral to mental health professionals based upon our prespecified cutoff scores on the nine-item Patient Health Questionnaire (PHQ-9), and if their symptoms varied by disease state; (2) the proportion of patients with anxiety symptoms, symptom severity, how many patients triggered a referral to mental health professionals based upon our prespecified cutoff scores on the seven-item Generalized Anxiety Disorder Scale (GAD-7), and if they symptoms varied by disease state; (3) whether other factors were associated with the proportion and severity of symptoms of anxiety or depression, such as tumor location in the body (axial skeleton, upper extremity, or lower extremity), general type of tumor (bone or soft tissue), specific diagnosis, use of chemotherapy, length of follow-up (less than 1 year or greater than 1 year), and gender; and (4) what proportion of patients accepted referrals to mental health professionals, when offered. METHODS: This study was a cross-sectional survey study performed at a single urban National Cancer Institute-designated Comprehensive Cancer Center from April 2021 until July 2021. All patients seen in the orthopaedic clinic 18 years of age and older with a diagnosis/presumed diagnosis of sarcoma were provided the PHQ-9 as well as the GAD-7 in our clinic. We did not track those who elected not to complete the surveys. Surveys were scored per survey protocol (each question was scored from 0 to 3 and summed). Specifically, PHQ-9 scores the symptoms of depression as 5 to 9 (mild), 10 to 14 (moderate), 15 to 19 (moderately severe), and 20 to 27 (severe). The GAD-7 scores symptoms of anxiety as 5 to 9 (mild), 10 to 14 (moderate), and 15 to 21 (severe). Patients with PHQ-9 or GAD-7 scores of 10 to 14 were referred to social work and those with scores 15 or higher were referred to psychiatry. Patients with thoughts of self-harm were referred regardless of score. Patients were divided based on disease state: patients during their initial management; patients with active, locally recurrent disease; patients with active metastatic disease; patients with prior recurrence or metastatic lesions who were subsequently treated and now have no evidence of disease (considered to be patients with discontinuous no evidence of disease); patients with no evidence of disease; and patients with an active, noncancerous complication but otherwise no evidence of disease. We additionally looked at the association of gender, chemotherapy administration, and tumor location on survey responses. Data are summarized using descriptive statistics. Differences across categories of disease state were tested for statistical significance using Kruskal-Wallis tests for continuous variables and Fisher exact tests for categorical variables as well as pairwise Wilcoxon rank sum tests. RESULTS: Overall, symptoms of depression were seen in 35% (67 of 190) of patients, at varying levels of severity: 19% (37 of 190) had mild symptoms, 9% (17 of 190) had moderate symptoms, 6% (12 of 190) had moderately severe symptoms, and 1% (1 of 190) had severe symptoms. Depresssion symptoms severe enough to trigger a referral were seen in 17% (32 of 190) of patients overall. Patients scored higher on the PHQ-9 during their initial treatment or when they had recurrent or metastatic disease, and they were more likely to trigger a referral during those timepoints as well. The mean PHQ-9 was 5.7 ± 5.8 during initial treatment, 6.1 ± 4.9 with metastatic disease, and 7.4 ± 5.2 with recurrent disease as compared with 3.2 ± 4.2 if there was no evidence of disease (p = 0.001). Anxiety symptoms were seen in 33% (61 of 185) of patients: 17% (32 of 185) had mild symptoms, 8% (14 of 185) had moderate symptoms, and 8% (15 of 185) had severe symptoms. Anxiety symptoms severe enough to trigger a referral were seen in 16% (29 of 185) of patients overall. Patients scored higher on the GAD-7 during initial treatment and when they had recurrent disease or an active noncancerous complication. The mean GAD-7 was 6.3 ± 3.2 in patients with active noncancerous complications, 6.8 ± 5.8 in patients during initial treatment, and 8.4 ± 8.3 in patients with recurrent disease as compared with 3.1 ± 4.2 in patients with no evidence of disease (p = 0.002). Patients were more likely to trigger a referral during initial treatment (32% [9 of 28]) and with recurrent disease (43% [6 of 14]) compared with those with no evidence of disease (9% [9 of 97]) and those with discontinuous no evidence of disease (6% [1 of 16]; p = 0.004). There was an increase in both PHQ-9 and GAD-7 scores among patients who had chemotherapy. Other factors that were associated with higher PHQ-9 scores were location of tumor (upper extremity versus lower extremity or axial skeleton) and gender. Another factor that was associated with higher GAD-7 scores included general category of diagnosis (bone versus soft tissue sarcoma). Specific diagnosis and length of follow-up had no association with symptoms of depression or anxiety. Overall, 22% (41 of 190) of patients were offered referrals to mental health professionals; 73% (30 of 41) accepted the referral. CONCLUSION: When treating patients with sarcoma, consideration should be given to potential concomitant psychiatric symptoms. Screening, especially at the highest-risk timepoints such as at the initial diagnosis and the time of recurrence, should be considered. Further work should be done to determine the effect of early psychiatric referral on patient-related outcomes and healthcare costs. LEVEL OF EVIDENCE: Level III, therapeutic study.

Anti-IL17 antibody Secukinumab therapy is associated with ossification in giant cell tumor of bone: a case report of pathologic similarities and therapeutic potential similar to Denosumab.

BACKGROUND: Giant cell tumor of bone is a benign, locally aggressive neoplasm. Surgical resection is the preferred treatment method. However, for cases in which resection poses an increased risk to the patient, denosumab (anti-RANKL monoclonal antibody) is considered. Secukinumab is an anti-IL-17 antibody that is used in psoriatic arthritis to reduce bone resorption and articular damage. CASE PRESENTATION: One case of giant cell tumor of bone (GCTB) in a patient treated with secukinumab for psoriatic arthritis demonstrated findings significant for intra-lesional calcifications. Histologic examination showed ossification, new bone formation, and remodeling. A paucity of osteoclast type giant cells was noted. Real-time quantitative polymerase-chain-reaction (qRT-PCR) analysis revealed decreased osteoclast function compared to treatment-naive GCTB. CONCLUSIONS: Secukinumab may play a role in bone remodeling for GCTB. Radiologists, surgeons, and pathologists should be aware of this interaction, which can cause lesional ossification. Further research is required to define the therapeutic potential of this drug for GCTB and osteolytic disease.

Sentinel lymph node biopsy predicts systemic recurrence in digital papillary adenocarcinoma.

BACKGROUND AND OBJECTIVES: Digital papillary adenocarcinoma (DPA) is a rare, aggressive neoplasm of sweat gland origin. It can recur at local, regional, or distant sites. There is limited knowledge about the role of sentinel lymph node biopsy (SLNB) in predicting recurrence in these patients. We present our experience with this uncommon tumor to evaluate the role of SLNB in predicting outcome. METHODS: Medical records of all patients who underwent surgical treatment for biopsy-proven upper extremity DPA at the study institution were reviewed. Descriptive statistics and Fisher's exact test were used to analyze data. RESULTS: Twenty-one patients were identified. Most patients were male (71%), and the median age was 51 years. SLNB was performed in 18 patients; three were positive for nodal metastatic disease (17%). At a median follow-up of 53 months, there were no local recurrences and two cases of systemic recurrence. No patient with a negative sentinel lymph node has evidence of metastasis or recurrence. Fisher's exact test demonstrated a significant association between a positive SLNB and recurrence (P = .02). CONCLUSION: SLNB revealed metastatic disease in 17% of patients with DPA and appears to predict systemic recurrence in this small series.

Prophylactic Radiation Therapy Versus Standard of Care for Patients With High-Risk Asymptomatic Bone Metastases: A Multicenter, Randomized Phase II Clinical Trial.

PURPOSE: External-beam radiation therapy (RT) is standard of care (SOC) for pain relief of symptomatic bone metastases. We aimed to evaluate the efficacy of radiation to asymptomatic bone metastases in preventing skeletal-related events (SRE). METHODS: In a multicenter randomized controlled trial, adult patients with widely metastatic solid tumor malignancies were stratified by histology and planned SOC (systemic therapy or observation) and randomly assigned in a 1:1 ratio to receive RT to asymptomatic high-risk bone metastases or SOC alone. The primary outcome of the trial was SRE. Secondary outcomes included hospitalizations for SRE and overall survival (OS). RESULTS: A total of 78 patients with 122 high-risk bone metastases were enrolled between May 8, 2018, and August 9, 2021, at three institutions across an affiliated cancer network in the United States. Seventy-three patients were evaluable for the primary end point. The most common primary cancer types were lung (27%), breast (24%), and prostate (22%). At 1 year, SRE occurred in one of 62 bone metastases (1.6%) in the RT arm and 14 of 49 bone metastases (29%) in the SOC arm (P < .001). There were significantly fewer patients hospitalized for SRE in the RT arm compared with the SOC arm (0 v 4, P = .045). At a median follow-up of 2.5 years, OS was significantly longer in the RT arm (hazard ratio [HR], 0.49; 95% CI, 0.27 to 0.89; P = .018), which persisted on multivariable Cox regression analysis (HR, 0.46; 95% CI, 0.23 to 0.85; P = .01). CONCLUSION: Radiation delivered prophylactically to asymptomatic, high-risk bone metastases reduced SRE and hospitalizations. We also observed an improvement in OS with prophylactic radiation, although a confirmatory phase III trial is warranted.

Analysis of Risk Factors and Impact of Tumor Size in Radical Soft Tissue Sarcoma Resection.

INTRODUCTION: There is relatively little current literature analyzing predictive factors of postoperative complications in radical soft tissue sarcoma (STS) resection. The goal was to analyze risk factors based on STS size ( < 5 cm vs. > 5 cm) with regard to STS resection in a large up-to-date, multi- center, population-based study. Additionally, we sought to determine any independent risk factors for the development of postoperative complications. METHODS: Our study was completed through a retrospec- tive analysis of 2005-2014 American College of Surgeons National Surgical Quality Improvement Program (ACS- NSQIP). Data were queried for patients undergoing radical resection for soft tissue tumor based on CPT code. Univari- ate analysis, t-test, and multivariate logistic regressions were employed adjusting for patient demographic, preoperative, and intraoperative variables in order to identify patient- and surgery-specific predictive factors for patients who devel- oped complications. RESULTS: Based on the 1,845 patients who met the inclu- sion criteria, 1,709 (92.62%) had a STS smaller than 5 cm and 136 (7.37%) had tumors larger than 5 cm. Results indicate that larger tumors yield greater risk and greater po- tential for wound complications. Specifically, adult patients who had radical resection of soft tissue tumors greater than 5 cm were more likely to have inpatient status, history of smoking, hypertension, disseminated cancer, chemotherapy and radiation, and were more likely to have longer length of stay in the hospital. CONCLUSION: The results indicate that larger tumors (> 5 cm) carry greater risk for complications. We hypothesize that this may be due to larger tumors being more invasive and requiring greater surgical manipulation. As such, it is important to provide appropriate counseling and proper preoperative planning for these patients.

Operative management of metastatic disease of the acetabulum: review of the literature and prevailing concepts.

Metastatic disease of the periacetabular region is a common problem in orthopaedic oncology, associated with severe pain, decreased mobility, and substantial decline of the quality of life. Conservative management includes optimisation of pain management, activity modification, and radiation therapy. However, patients with destructive lesions affecting the weight-bearing portion of the acetabulum often require reconstructive surgery to decrease pain and restore mobility. The goal of surgery is to provide an immediately stable and durable construct, allowing immediate postoperative weight-bearing and maintaining functional independence for the remaining lifetime of the patient. A variety of surgical techniques have been reported, most of which are based upon cemented total hip arthroplasty, but also include porous tantalum implants and percutaneous cementoplasty. This review discusses the various reconstructive concepts and options, including their respective indications and outcome. A reconstructive algorithm incorporating different techniques and strategies based upon location and quality of remaining bone is also presented.

A Worksheet to Facilitate Discussions of Values for Patients With Metastatic Cancer: A Pilot Study.

CONTEXT: Individual goals and values should drive medical decision making for patients with serious illness. Unfortunately, clinicians' existing strategies to encourage reflection and communication regarding patients' personal values are generally time-consuming and limited in scope. OBJECTIVES: Herein, we develop a novel intervention to facilitate at-home reflection and discussion about goals and values. We then conduct a pilot study of our intervention in a small population of patients with metastatic cancer. METHODS: We first engaged former cancer patients and their families to adapt an existing serious illness communication guide to a worksheet format. We then distributed this adapted "Values Worksheet" to 28 patients with metastatic cancer. We surveyed participants about their perceptions of the Worksheet to assess its feasibility. RESULTS: Of 30 patients approached, 28 agreed to participate. Seventeen participants completed the Values Worksheet, and of those 11 (65%) responded to the follow-up survey. Seven of eleven reported that the Values Worksheet was a good use of time, and nine of eleven would be likely to recommend it to other patients with cancer. Eight of ten reported mild distress, two of ten reported moderate to severe distress. CONCLUSION: The Values Worksheet was a feasible way to facilitate at-home discussions of goals and values for select patients with metastatic cancer. Further research should focus on identifying which patients are most likely to benefit from the Values Worksheet, and should employ the Worksheet as one tool to facilitate reflection on the questions that arise around serious illness, as an adjunct to serious illness conversations with a physician.

Quantitative preoperative patient assessments are related to survival and procedure outcome for osseous metastases.

Aims: Our objective was to determine if preoperative patient-reported assessments are associated with survival after surgery for stabilization of skeletal metastases. Patients and Methods: All patients with metastatic cancer to bone and indications for skeletal stabilization surgery were approached to participate in a prospective cohort study at a tertiary care center from 2012 to 2017. Of the 208 patients who were eligible, 195 (94%) completed the 36-item Short Form Health Survey (SF-36) preoperatively and underwent surgical treatment of skeletal metastases with complete or impending fractures; the sample encompassed a range of cancer diagnoses and included cases of both internal fixation and endoprosthetic replacement. Cox proportional hazards models were used to identify associations between SF-36 scores and survival. Results: In a model adjusted for clinical factors, patients' mental and physical SF-36 component summary scores were significantly associated with survival, as was their SF-36 composite score (P = 0.004, P = 0.015, and P < 0.001, respectively). Scores in the general health, vitality, and mental health domains were each strongly associated with survival (P < 0.001). Conclusions: Patients' preoperative assessments of their health status are associated with their survival after surgery for skeletal metastases. Patient-reported assessments have the potential to contribute unique information to models that estimate patient survival, as part of efforts to provide optimal, individualized care and make informed decisions about the type and magnitude of surgery for metastatic bone disease that will last the patient's lifetime.

Personalized Treatment Selection Leads to Low Rates of Local Salvage Therapy for Bone Metastases.

PURPOSE: Local therapy for patients with nonspine bone metastases is evolving, with data supporting the use of single-fraction treatments, and more recently, showing possible benefit from stereotactic body radiation therapy (SBRT). However, the rate of local salvage therapy (LST) after each technique has not been characterized in real-world clinic settings where patients are selected at physician discretion. We examined rates of LST in patients with nonspine bone metastases. METHODS AND MATERIALS: We reviewed records of RT for nonspine bone metastases at our institution from January 1, 2016, to December 31, 2018. We defined LST as the first occurrence of RT or surgery for oncologic progression to a bone metastasis after initial RT. Cumulative incidence functions for retreatment were generated. We conducted multivariate analysis to identify variables associated with LST. RESULTS: A total of 1754 patients were analyzed, with median follow-up of 16.2 months (range, 0-36.8 months). Of all episodes of RT, 51.5% were multifraction external beam radiation therapy (EBRT), 7.0% were single-fraction EBRT, and 41.4% were SBRT. Altogether, 88 patients (5.0%) required LST, with an incidence at 6 months of 2.5%. Incidence of LST at 6 months was 2.1% for SBRT, 5.3% for single-fraction conventional regimens, and 2.4% for multifraction conventional regimens (P = .26). Patients of younger age, who had a higher Karnofsky performance status, and/or who had lesions in the pelvis had a higher risk of retreatment. CONCLUSIONS: In this large institutional cohort, the rate of LST was low, with no difference between RT techniques. The findings indicated that SBRT for patients at high risk for treatment failure may reduce the rate of retreatment overall. When treatment modality was selected based on patient characteristics, rates of LST were lower than when treatment was randomly selected.

Multidisciplinary Treatment of Non-Spine Bone Metastases: Results of a Modified Delphi Consensus Process.

Purpose: Local treatment for bone metastases is becoming increasingly complex. National guidelines traditionally focus only on radiation therapy (RT), leaving a gap in clinical decision support resources available to clinicians. The objective of this study was to reach expert consensus regarding multidisciplinary management of non-spine bone metastases, which would facilitate standardizing treatment within an academic-community partnership. Methods and Materials: A multidisciplinary panel of physicians treating metastatic disease across the Memorial Sloan Kettering (MSK) Cancer Alliance, including community-based partner sites, was convened. Clinical questions rated of high importance in the management of non-spine bone metastases were identified via survey. A literature review was conducted, and panel physicians drafted initial recommendation statements. Consensus was gathered on recommendation statements through a modified Delphi process from a full panel of 17 physicians from radiation oncology, orthopaedic surgery, medical oncology, interventional radiology, and anesthesia pain. Consensus was defined a priori as 75% of respondents indicating "agree" or "strongly agree" with the consensus statement. Strength of Recommendation Taxonomy was employed to assign evidence strength for each statement. Results: Seventeen clinical questions were identified, of which 11 (65%) were selected for the consensus process. Consensus was reached for 16 of 17 answer statements (94%), of which 12 were approved after Round 1 and additional 4 approved after Round 2 of the modified Delphi voting process. Topics included indications for referral to surgery or interventional radiology, radiation fractionation and appropriate use of stereotactic approaches, and the handling of systemic therapies during radiation. Evidence strength was most commonly C (n = 7), followed by B (n = 5) and A (n = 3). Conclusions: Consensus among a multidisciplinary panel of community and academic physicians treating non-spine bone metastases was feasible. Recommendations will assist clinicians and potentially provide measures to reduce variation across diverse practice settings. Findings highlight areas for further research such as pathologic fracture risk estimation, pre-operative radiation, and percutaneous ablation.

Periacetabular reconstruction following limb-salvage surgery for pelvic sarcomas.

Limb-salvage surgery for pelvic sarcomas remains one of the most challenging surgical procedures for musculoskeletal oncologists. In the past several decades, various surgical techniques have been developed for periacetabular reconstruction following pelvic tumor resection. These methods include endoprosthetic reconstruction, allograft or autograft reconstruction, arthrodesis, and hip transposition. Each of these procedures has its own advantages and disadvantages, and there is no consensus or gold standard for periacetabular reconstruction. Consequently, this review provides an overview of the clinical outcomes for each of these reconstructive options following pelvic tumor resections. Overall, high complication rates are associated with the use of massive implants/grafts, and deep infection is generally the most common cause of reconstruction failure. Functional outcomes decline with the occurrence of severe complications. Further efforts to avoid complications using innovative techniques, such as antibiotic-laden devices, computer navigation, custom cutting jigs, and reduced use of implants/grafts, are crucial to improve outcomes, especially in patients at a high risk of complications.

Postradiation Fractures after Combined Modality Treatment in Extremity Soft Tissue Sarcomas.

Soft tissue sarcoma (STS) of the extremities is typically treated with limb-sparing surgery and radiation therapy; with this treatment approach, high local control rates can be achieved. However, postradiation bone fractures, fractures occurring in the prior radiation field with minimal or no trauma, are a serious late complication that occurs in 2-22% of patients who receive surgery and radiation for STS. Multiple risk factors for sustaining a postradiation fracture exist, including high radiation dose, female sex, periosteal stripping, older age, femur location, and chemotherapy administration. The treatment of these pathological fractures can be difficult, with complications including delayed union, nonunion, and infection posing particular challenges. Here, we review the mechanisms, risk factors, and treatment challenges associated with postradiation fractures in STS patients.

Minimal clinically important differences in SF-36 global score: Current value in orthopedic oncology.

The SF-36 is widely used to evaluate the health-related quality of life (HRQoL) of patients with musculoskeletal tumors. Instead of typical methods, calculating the SF-36 Global Score has recently become an increasingly common reporting approach. However, numerical changes lack clear clinical relevance. The minimal clinically important difference (MCID) is useful for interpreting changes in functional scores by defining the smallest change patients may perceive as clinically meaningful. The aim of this study is to determine the MCID of the SF-36 Global Score in orthopedic oncology patients, which has not been reported to date. Three-hundred ten patients who underwent surgery and completed two surveys during postoperative follow-up were reviewed. The two most common methods for calculating the SF-36 Global Score were used: (1) anchor-based methods and receiver operating characteristic analysis based on one-half of the SD of change score and standard error of measurement at baseline and; (2) distribution-based methods. Using anchor-based methods, the MCIDs of SF-36 Global Scores #1 and #2 were 2.7 (area under the curve [AUC] = 0.85) and 2.5 (AUC = 0.79) for improvement, and -1.5 (AUC = 0.81) and -0.6 (AUC = 0.83) for deterioration, respectively. Using distribution-based methods, the MCIDs of SF-36 Global Scores #1 and #2 were 4.1 and 4.4 by half SD, and 4.1 and 4.5 by standard error of measurement, respectively. Our findings provide benchmark values, which can serve as a reference for future studies in musculoskeletal tumor patients using the SF-36 Global Score as a single measure for HRQoL.

Should Postoperative Radiation for Long Bone Metastases Cover Part or All of the Orthopedic Hardware? Results of a Large Retrospective Analysis.

PURPOSE: For patients with long bone metastases who undergo orthopedic stabilization surgery followed by radiotherapy (RT), it is unclear what extent of hardware coverage by the radiation field is needed for optimal tumor control. METHODS AND MATERIALS: Long bone metastases treated with surgical intervention followed by radiation between August 2011 to May 2019 from a single institution were reviewed. Local recurrence, defined as any in-bone recurrence, was identified by chart review. Accompanying demographic and treatment characteristics were recorded. Statistical analysis to evaluate factors associated with tumor recurrence included univariate analysis, multivariate analysis, and propensity score matching. RESULTS: Among 138 patients with 145 long bone metastases undergoing postoperative RT with a median follow-up of 29.5 months, 36 bone metastases experienced a local recurrence. Most patients (92%) were treated with conventional RT and the median delivered dose was 30 Gy (interquarile range, 20-30 Gy). On univariate analysis, whole hardware RT field coverage and higher dose (biologically effective dose 10 ≥39 Gy) were associated with reduced local recurrence (0.44 hazard ratio [HR]; 95% confidence interval [CI], 0.22%-0.86%; P = .017; 0.5 HR; 95% CI, 0.26%-0.96%; P = .038, respectively). Covariates of time from surgery to RT start, histology of primary tumor (categorized as resistant vs sensitive), intramedullary hardware placement, reaming procedure, and margin status did not reach statistical significance. To adjust for confounding effects, we also conducted a propensity score matched analysis which confirmed that whole hardware coverage was statistically associated with a decreased risk of recurrence on the matched dataset (0.24 HR; 95% CI, 0.07%-0.84%; P = .026). CONCLUSIONS: In this analysis of mostly patients undergoing conventional radiation, coverage of the whole hardware was associated with reduced local recurrence for patients with long bone metastases, consistent with prior reports. Investigation of approaches to further reduce local recurrence, such as preoperative stereotactic radiation, may be warranted.

Annulus fibrosus cell phenotypes in homeostasis and injury: implications for regenerative strategies.

Despite considerable efforts to develop cellular, molecular, and structural repair strategies and restore intervertebral disk function after injury, the basic biology underlying intervertebral disk healing remains poorly understood. Remarkably, little is known about the origins of cell populations residing within the annulus fibrosus, or their phenotypes, heterogeneity, and roles during healing. This review focuses on recent literature highlighting the intrinsic and extrinsic cell types of the annulus fibrosus in the context of the injury and healing environment. Spatial, morphological, functional, and transcriptional signatures of annulus fibrosus cells are reviewed, including inner and outer annulus fibrosus cells, which we propose to be referred to as annulocytes. The annulus also contains peripheral cells, interlamellar cells, and potential resident stem/progenitor cells, as well as macrophages, T lymphocytes, and mast cells following injury. Phases of annulus fibrosus healing include inflammation and recruitment of immune cells, cell proliferation, granulation tissue formation, and matrix remodeling. However, annulus fibrosus healing commonly involves limited remodeling, with granulation tissues remaining, and the development of chronic inflammatory states. Identifying annulus fibrosus cell phenotypes during health, injury, and degeneration will inform reparative regeneration strategies aimed at improving annulus fibrosus healing.

Poor Access to Opioid Addiction Care for Total Joint Arthroplasty Patients.

INTRODUCTION: The United States is experiencing an opioid epidemic, and orthopedists prescribe a large proportion of these drugs. Patients often become dependent on painkillers and face barriers to treatment. Given that many joint arthroplasty patients are enrolled in Medicare, we aimed to examine the ease of orthopedic patients with various insurance types to access addiction and pain specialists. METHODS: Using three web-based directories, we identified addiction specialists within a 5-mile radius of our hospital. We contacted these practices and inquired as to whether they treated addiction, types of insurance they accepted, and appointment availability. RESULTS: We identified 190 addiction and pain management specialists and were able to reach 134/190 (70.5%). Nine (6.7%) of the 134 reachable physicians accepted Medicare or Medicaid, which is nine (4.7%) of the 190 physicians initially located. The average wait time to an appointment was 4.2 days, and a significant difference in wait time existed across insurance types (p = 0.0284). DISCUSSION: Orthopedic patients face many barriers to receiving treatment for painkiller addiction. Wait time to see an addiction specialist also varied based on insurance type. Online directories may not be useful for certain patient populations to identify physicians. Orthopedic surgeons should partner with addiction and pain specialists to help alleviate the barriers that patients face.

The Effect of Absorbable Calcium Sulfate on Wear Rates in Ultra-high-Molecular-weight Polyethylene: Potential Implications for Its Use in Treating Arthroplasty Infections.

INTRODUCTION: Patients, hospitals, and healthcare systems incur substantial burdens when infections result in total joint revisions. One potential solution to mitigate some of these burdens may be to transition from a two-stage infection treatment to a single-stage procedure. Off-label use of an absorbable calcium sulfate antibiotic carrier has been implemented in single-stage and two-stage procedures globally, with the goal of moving toward more single-stage revisions in the United States. Adverse effects of calcium sulfate on the joint space during articulation are currently unknown. METHODS: This study aims to determine the impact of calcium sulfate beads on wear of polyethylene during and following exposure. Two phases of in vitro pin-on-disk testing were conducted. The first phase exposed polyethylene pins to calcium sulfate for 500,000 cycles of a 2-million cycle test. The second phase examined the wear of pins that were created from retrieved components exposed to calcium sulfate in vivo. RESULTS: No clinically significant difference was observed between the wear rates of the calcium sulfate-exposed polyethylene pins and the control polyethylene pins. DISCUSSION: Preliminary results suggest that a substantial increase in the wear rate of polyethylene is not expected with the addition of calcium sulfate beads during treatment of infection.

Failure of a Polyaryletheretherketone-Cobalt-Chromium Composite Femoral Stem Due to Coating Separation and Subsidence: A Case Report.

CASE: A 52-year-old man who previously had undergone total hip arthroplasty with use of an Epoch (Zimmer) extensively porous-coated femoral stem presented with hip pain after a high-energy motor-vehicle accident. Radiographs demonstrated delamination at the polyaryletheretherketone-cobalt-chromium (PEEK-CoCr) core interface, which led to loosening. At revision, the implant demonstrated gross evidence of debonding at the PEEK-CoCr interface. CONCLUSION: We demonstrate clinical and tribologic evidence of a rare failure mode involving the PEEK-metal interface in a composite femoral stem, which surgeons should be aware of when evaluating patients with this type of implant.