Bio

Clinical Focus


  • Pediatric tumors
  • Bone and soft tissue tumors
  • Sarcomas
  • Pelvic tumors
  • Hip and knee reconstruction
  • Orthopaedic Surgery

Academic Appointments


Professional Education


  • Internship:Univ of California at San Francisco General Surgery (2003) CA
  • Board Certification: Orthopaedic Surgery, American Board of Orthopaedic Surgery (2011)
  • Residency:Univ of California at San Francisco - Ortho Surgery (2007) CA
  • Fellowship:Univ of Chicago - Pritzker School of Medicine (2008) IL
  • Medical Education:University of Chicago Pritzker (2002) IL

Teaching

2016-17 Courses


Publications

All Publications


  • The Effect of Applicant Publication Volume on the Orthopaedic Residency Match. Journal of surgical education Campbell, S. T., Gupta, R., Avedian, R. S. 2016; 73 (3): 490-495

    Abstract

    Research is an important factor used in evaluating applicants to orthopaedic training programs. Current reports regarding the publication rate among prospective residents are likely inaccurate. It is unknown whether research productivity is weighted more heavily at programs affiliated with research-driven institutions.To establish accurate baseline data on publication rate among matched applicants to orthopaedic residency programs and to compare publication rates between applicants who matched at research-focused institutions and those who matched elsewhere.We performed a literature search for each U.S. resident in the 2013-2014 intern class. Number of publications: (1) in total, (2) in orthopaedic journals, and (3) as first/last author were recorded. Publication rate at the top 25 programs (according to medical school and departmental National Institutes of Health [NIH] funding and U.S. News ranking) was compared statistically against all others.Average number of publications per intern for all programs was 1.28 ± 0.15. Number of total and first/last author publications was significantly greater for programs affiliated with medical schools and departments in the top 25 for NIH funding, and at schools in the top 25 U.S. News rankings. Publication rate in orthopaedic journals was significantly higher for programs affiliated with departments in the top 25 for NIH funding and at top 25 U.S. News medical schools.The average matched applicant to an orthopaedic residency program publishes in the peer-reviewed literature less frequently than previously reported. Matched applicants at research-focused institutions tended to have more publications than those who matched at other programs.

    View details for DOI 10.1016/j.jsurg.2015.11.011

    View details for PubMedID 26861584

  • Effect of Patellar Resurfacing on Distal Femoral Replacements: Commentary on an article by Mauricio Etchebehere, MD, PhD, et al.: "Patellar Resurfacing. Does It Affect Outcomes of Distal Femoral Replacement After Distal Femoral Resection?". journal of bone and joint surgery. American volume Avedian, R. S. 2016; 98 (7)

    View details for DOI 10.2106/JBJS.15.01316

    View details for PubMedID 27053593

  • Is MR-guided High-intensity Focused Ultrasound a Feasible Treatment Modality for Desmoid Tumors? CLINICAL ORTHOPAEDICS AND RELATED RESEARCH Avedian, R. S., Bitton, R., Gold, G., Butts-Pauly, K., Ghanouni, P. 2016; 474 (3): 697-704

    Abstract

    MR-guided high-intensity focused ultrasound is a noninvasive treatment modality that uses focused ultrasound waves to thermally ablate tumors within the human body while minimizing side effects to surrounding healthy tissues. This technology is FDA-approved for certain tumors and has potential to be a noninvasive treatment option for extremity soft tissue tumors. Development of treatment modalities that achieve tumor control, decrease morbidity, or both might be of great benefit for patients. We wanted to assess the potential use of this technology in the treatment of extremity desmoid tumors.(1) Can we use MR-guided high-intensity focused ultrasound to accurately ablate a predetermined target volume within a human cadaver extremity? (2) Does MR-guided high-intensity focused ultrasound treatment stop progression and/or cause regression of extremity desmoid tumors?Simulated tumor volumes in four human cadavers, created by using plastic markers, were ablated using a commercially available focused ultrasound system. Accuracy was determined in accordance with the International Organization of Standards location error by measuring the farthest distance between the ablated tissue and the plane corresponding to the target. Between 2012 and 2014, we treated nine patients with desmoid tumors using focused ultrasound ablation. Indications for this were tumor-related symptoms or failure of conventional treatment. Of those, five of them were available for MRI followup at 12 months or longer (mean, 18.2 months; range, 12-23 months). The radiographic and clinical outcomes of five patients who had desmoid tumors treated with focused ultrasound were prospectively recorded. Patients were assessed preoperatively with MRI and followed at routine intervals after treatment with MRI scans and clinical examination.The ablation accuracy for the four cadaver extremities was 5 mm, 3 mm, 8 mm, and 8 mm. Four patients' tumors became smaller after treatment and one patient has slight progression at the time of last followup. The mean decrease in tumor size determined by MRI measurements was 36% (95% confidence interval, 7%-66%). No patient has received additional adjuvant systemic or local treatment. Treatment-related adverse events included first- and second-degree skin burns occurring in four patients, which were managed successfully without further surgery.This preliminary investigation provides some evidence that MR-guided high-intensity focused ultrasound may be a feasible treatment for desmoid tumors. It may also be of use for other soft tissue neoplasms in situations in which there are limited traditional treatment options such as recurrent sarcomas. Further investigation is necessary to better define the indications, efficacy, role, and long-term oncologic outcomes of focused ultrasound treatment.Level IV, therapeutic study.

    View details for DOI 10.1007/s11999-015-4364-0

    View details for Web of Science ID 000370150000018

    View details for PubMedID 26040967

  • Sarcoma Resection With and Without Vascular Reconstruction: A Matched Case-control Study ANNALS OF SURGERY Poultsides, G. A., Tran, T. B., Zambrano, E., Janson, L., Mohler, D. G., Mell, M. W., Avedian, R. S., Visser, B. C., Lee, J. T., Ganjoo, K., Harris, E. J., Norton, J. A. 2015; 262 (4): 632-640

    Abstract

    To examine the impact of major vascular resection on sarcoma resection outcomes.En bloc resection and reconstruction of involved vessels is being increasingly performed during sarcoma surgery; however, the perioperative and oncologic outcomes of this strategy are not well described.Patients undergoing sarcoma resection with (VASC) and without (NO-VASC) vascular reconstruction were 1:2 matched on anatomic site, histology, grade, size, synchronous metastasis, and primary (vs. repeat) resection. R2 resections were excluded. Endpoints included perioperative morbidity, mortality, local recurrence, and survival.From 2000 to 2014, 50 sarcoma patients underwent VASC resection. These were matched with 100 NO-VASC patients having similar clinicopathologic characteristics. The rates of any complication (74% vs. 44%, P = 0.002), grade 3 or higher complication (38% vs. 18%, P = 0.024), and transfusion (66% vs. 33%, P < 0.001) were all more common in the VASC group. Thirty-day (2% vs. 0%, P = 0.30) or 90-day mortality (6% vs. 2%, P = 0.24) were not significantly higher. Local recurrence (5-year, 51% vs. 54%, P = 0.11) and overall survival after resection (5-year, 59% vs. 53%, P = 0.67) were similar between the 2 groups. Within the VASC group, overall survival was not affected by the type of vessel involved (artery vs. vein) or the presence of histology-proven vessel wall invasion.Vascular resection and reconstruction during sarcoma resection significantly increases perioperative morbidity and requires meticulous preoperative multidisciplinary planning. However, the oncologic outcome appears equivalent to cases without major vascular involvement. The anticipated need for vascular resection and reconstruction should not be a contraindication to sarcoma resection.

    View details for DOI 10.1097/SLA.0000000000001455

    View details for Web of Science ID 000367999800009

  • What Is the Use of Imaging Before Referral to an Orthopaedic Oncologist? A Prospective, Multicenter Investigation CLINICAL ORTHOPAEDICS AND RELATED RESEARCH Miller, B. J., Avedian, R. S., Rajani, R., Leddy, L., White, J. R., Cummings, J., Balach, T., Macdonald, K. 2015; 473 (3): 868-874

    Abstract

    Patients often receive advanced imaging before referral to an orthopaedic oncologist. The few studies that have evaluated the value of these tests have been single-center studies, and there were large discrepancies in the estimated frequencies of unnecessary use of diagnostic tests.(1) Is there regional variation in the use of advanced imaging before referral to an orthopaedic oncologist? (2) Are these prereferral studies helpful to the treating orthopaedic oncologist in making a diagnosis or treatment plan? (3) Are orthopaedic surgeons less likely to order unhelpful studies than other specialties? (4) Are there any tumor or patient characteristics that are associated with the ordering of an unhelpful study?We performed an eight-center prospective analysis of patients referred for evaluation by a fellowship-trained orthopaedic oncologist. We recorded patient factors, referral details, advanced imaging performed, and presumptive diagnosis. The treating orthopaedic oncologist determined whether each study was helpful in the diagnosis or treatment of the patient based on objective and subjective criteria used in prior investigations. We analyzed the data using bivariate methods and logistic regression to determine regional variation and risk factors predictive of unhelpful advanced imaging. Of the 371 participants available for analysis, 301 (81%) were referred with an MRI, CT scan, bone scan, ultrasound, or positron emission tomography scan.There were no regional differences in the use of advanced imaging (range of patients presenting with advanced imaging 66%-88% across centers, p = 0.164). One hundred thirteen patients (30%) had at least one unhelpful study; non-MRI advanced imaging was more likely to be unhelpful than MRIs (88 of 129 [68%] non-MRI imaging versus 46 of 263 [17%] MRIs [p < 0.001]). Orthopaedic surgeons were no less likely than nonorthopaedic surgeons to order unhelpful studies before referral to an orthopaedic oncologist (56 of 179 [31%] of patients referred by orthopaedic surgeons versus 35 of 119 [29%] referred by primary care providers and 22 of 73 [30%] referred by nonorthopaedic specialists, p = 0.940). After controlling for potential confounding variables, benign bone lesions had an increased odds of referral with an unhelpful study (59 of 145 [41%] of benign bone tumors versus 54 of 226 [24%] of soft tissue tumors and malignant bone tumors; odds ratio, 2.80; 95% confidence interval, 1.68-4.69, p < 0.001).We found no evidence that the proportion of patients referred with advanced imaging varied dramatically by region. Studies other than MRI were likely to be considered unhelpful and should not be routinely ordered by referring physicians. Diligent education of orthopaedic surgeons and primary care physicians in the judicious use of advanced imaging in benign bone tumors may help mitigate unnecessary imaging.Level III, diagnostic study. See Guidelines for Authors for a complete description of levels of evidence.

    View details for DOI 10.1007/s11999-014-3649-z

    View details for Web of Science ID 000349242200019

    View details for PubMedID 24777726

  • Antirotation pins improve stability of the compress limb salvage implant: a biomechanical study. Clinical orthopaedics and related research Avedian, R. S., Chen, T., Lindsey, D., Palanca, A., Mohler, D. 2014; 472 (12): 3982-3986

    Abstract

    Limb salvage implants that rely on compliant compression osseointegration to achieve bone fixation may achieve longer survivorship rates compared with traditional cemented or press-fit stemmed implants; however, failures resulting from rotational instability have been reported. The effect of using antirotation pins on the rotational stability of the fixation has not been well studied.We asked the following question: When tested in a cadaver model, does the use of antirotation pins increase the torque required to cause implant failure or rotation?Thirty-two cadaver femurs were divided into four groups of eight femurs. We compared the torque to failure among groups containing zero, one, two, three, and four pins using a servohydraulic testing device.Adding antirotation pins increased the torque required to cause failure (R(2) = 0.77; p < 0.001). This increase was most notable in groups comparing zero pins with one pin (14 N-m, [95% CI, 10.9-17.1] versus 23 N-m, [95% CI 22.5-23.48]; p = 0.01) and two compared with three pins (29 N-m, [95% CI, 21.7-36.3] versus 42 N-m, [95% CI, 37.8-46.2]; p = 0.35).It appears that the use of antirotation pins improves rotational stability of the compliant compression endoprosthesis. Although these findings need to be verified in a clinical study, the addition of antirotation pins may improve osteointegration and we have changed our practice to use a minimum of three antirotation pins when implanting this device.Improvements in implant technology and surgical techniques may lead to improved clinical outcomes and patient quality of life. Addition of antirotation pins appears to improve implant stability and may decrease the need for revision surgery.

    View details for DOI 10.1007/s11999-014-3899-9

    View details for PubMedID 25209342

  • Antirotation Pins Improve Stability of the Compress Limb Salvage Implant: A Biomechanical Study CLINICAL ORTHOPAEDICS AND RELATED RESEARCH Avedian, R. S., Chen, T., Lindsey, D., Palanca, A., Mohler, D. 2014; 472 (12): 3982-3986
  • Principles of musculoskeletal biopsy. Cancer treatment and research Avedian, R. S. 2014; 162: 1-7

    Abstract

    The appropriate treatment of any musculoskeletal tumor is based on a correct diagnosis. In some instances, a patient's history and imaging studies provide sufficient information to guide definitive treatment. However, in many cases, a biopsy may be necessary. A biopsy, although technically simple, must be conducted in a thoughtful manner in order to obtain an accurate tissue sample while avoiding complications. Some potential complications include inaccurate sampling, improperly placed incision that complicates future surgeries, and healthy tissue contamination that can add morbidity to the definitive surgery or preclude the chance of limb salvage. This chapter will review the considerations for planning and performing a biopsy of musculoskeletal tumors.

    View details for DOI 10.1007/978-3-319-07323-1_1

    View details for PubMedID 25070228

  • Changes in Health Status Among Aging Survivors of Pediatric Upper and Lower Extremity Sarcoma: A Report From the Childhood Cancer Survivor Study ARCHIVES OF PHYSICAL MEDICINE AND REHABILITATION Marina, N., Hudson, M. M., Jones, K. E., Mulrooney, D. A., Avedian, R., Donaldson, S. S., Popat, R., West, D. W., Fisher, P., Leisenring, W., Stovall, M., Robison, L. L., Ness, K. K. 2013; 94 (6): 1062-1073

    Abstract

    To evaluate health status and participation restrictions in survivors of childhood extremity sarcomas.Members of the Childhood Cancer Survivor Study cohort with extremity sarcomas who completed questionnaires in 1995, 2003, or 2007 were included.Cohort study of survivors of extremity sarcomas.Childhood extremity sarcoma survivors (N=1094; median age at diagnosis, 13y (range, 0-20y); current age, 33y (range, 10-53y); 49% male; 87.5% white; 75% had lower extremity tumors) who received their diagnosis and treatment between 1970 and 1986.Not applicable.Prevalence rates for poor health status in 6 domains and 5 suboptimal social participation categories were compared by tumor location and treatment exposure with generalized estimating equations adjusted for demographic/personal factors and time/age.In adjusted models, when compared with upper extremity survivors, lower extremity survivors had an increased risk of activity limitations but a lower risk of not completing college. Compared with those who did not have surgery, those with limb-sparing (LS) and upper extremity amputations (UEAs) were 1.6 times more likely to report functional impairment, while those with an above-the-knee amputation (AKA) were 1.9 times more likely to report functional impairment. Survivors treated with LS were 1.5 times more likely to report activity limitations. Survivors undergoing LS were more likely to report inactivity, incomes <$20,000, unemployment, and no college degree. Those with UEAs more likely reported inactivity, unmarried status, and no college degree. Those with AKA more likely reported no college degree. Treatment with abdominal irradiation was associated with an increased risk of poor mental health, functional impairment, and activity limitation.Treatment of lower extremity sarcomas is associated with a 50% increased risk for activity limitations; upper extremity survivors are at a 10% higher risk for not completing college. The type of local control influences health status and participation restrictions. Both of these outcomes decline with age.

    View details for DOI 10.1016/j.apmr.2013.01.013

    View details for Web of Science ID 000319954400008

  • Successful Surgical and Medical Treatment of Rhizopus Osteomyelitis Following Hematopoietic Cell Transplantation ORTHOPEDICS Vashi, N., Avedian, R., Brown, J., Arai, S. 2012; 35 (10): E1556-E1561

    Abstract

    Mucormycosis has been reported in otherwise healthy individuals; however, it is primarily seen in immunocompromised patients, such as those with diabetes mellitus, malignancy, or chronic graft-versus-host disease, and has a high mortality rate. Because most cases of mucormycosis are associated with contiguous rhinocerebral infection, only 5 cases of isolated musculoskeletal Rhizopus infection have been reported in the literature. One patient underwent hematopoietic cell transplant, which resulted in a fatal outcome.This article describes the successful treatment of isolated Rhizopus osteomyelitis in a patient who underwent hematopoietic cell transplant using a combined surgical and medical approach. A 33-year-old woman with pre-B cell acute lymphoblastic leukemia underwent hematopoietic cell transplant with few complications but developed chronic graft-versus-host disease 8 months posttransplant. She was treated with high-dose steroids for 6 weeks before she was admitted for severe right tibial pain in the absence of trauma. Early detection, aggressive therapies, and a multidisciplinary surgical and medical team allowed for the microbiologically confirmed resolution of the infection. Treatment included multiagent antimicrobial therapy with amphotericin B, daptomycin, and ertapenem. Several surgical irrigation and debridement procedures were also performed, with the eventual placement of amphotericin-impregnated polymethylmethacrylate cement beads and small fragment titanium screws. The patient continued taking postoperative antifungal treatment for 7 months after discharge. Six months following the discontinuation of antifungal therapy, the team's multidisciplinary approach achieved a continued resolution of the patient's infection and a return to a fully ambulatory and radiographically proven recovery without limb loss.

    View details for DOI 10.3928/01477447-20120919-30

    View details for Web of Science ID 000309814600019

    View details for PubMedID 23027498

  • Surgical Technique: Methods for Removing a Compress (R) Compliant Prestress Implant CLINICAL ORTHOPAEDICS AND RELATED RESEARCH Abrams, G. D., Gajendran, V. K., Mohler, D. G., Avedian, R. S. 2012; 470 (4): 1204-1212

    Abstract

    The Compress® device uses a unique design using compressive forces to achieve bone ingrowth on the prosthesis. Because of its design, removal of this device may require special techniques to preserve host bone. DESCRIPTION OF TECHNIQUES: Techniques needed include removal of a small amount of bone to relieve compressive forces, use of a pin extractor and/or Kirschner wires for removal of transfixation pins, and creation of a cortical window in the diaphysis to gain access to bone preventing removal of the anchor plug.We retrospectively reviewed the records of 63 patients receiving a Compress® device from 1996 to 2011 and identified 11 patients who underwent subsequent prosthesis removal. The minimum followup was 1 month (average, 20 months; range, 1-80 months). The most common reason for removal was infection (eight patients) and the most common underlying diagnosis was osteosarcoma (five patients). Three patients underwent above-knee amputation, whereas the others (eight patients) had further limb salvage procedures at the time of prosthesis removal.Five patients had additional unplanned surgeries after explantation. Irrigation and débridement of the surgical wound was the most common unplanned procedure followed by latissimus free flap and hip prosthesis dislocation. At the time of followup, all patients were ambulating on either salvaged extremities or prostheses.Although removal of the Compress® device presents unique challenges, we describe techniques to address those challenges.

    View details for DOI 10.1007/s11999-011-2128-z

    View details for Web of Science ID 000301442800032

    View details for PubMedID 22002827

  • Surgical Intervention of Nonvertebral Osseous Metastasis CANCER CONTROL Attar, S., Steffner, R. J., Avedian, R., Hussain, W. M. 2012; 19 (2): 113-121

    Abstract

    Nonvertebral osseous metastases can result in pain and disability. The goals of surgical intervention are to reduce pain and to improve function if nonsurgical treatment fails. The indications for proceeding with surgical intervention depend on anatomic location, amount of local destruction, extent of skeletal and visceral disease and, most important, the patient's performance status and life expectancy.This article reviews the evaluation and treatment of metastatic nonvertebral osseous lesions from the perspective of the orthopedic surgeon, based mainly on an assessment of the surgical literature.This article summarizes the approaches to preoperative evaluation, patient selection, and medical optimization. Guidelines for estimating osseous stability and fracture risk are discussed, and surgical implants and their relation to postoperative outcomes are examined. This review also describes less invasive ablative procedures currently available.The surgical management of nonvertebral osseous metastases involves multidisciplinary collaboration. The surgical construct must be a stable, reliable, and durable intervention that is individually tailored and matched to a patient's prognosis and performance status.

    View details for Web of Science ID 000307969100005

    View details for PubMedID 22487973

  • Curettage and Cryosurgery for Low-grade Cartilage Tumors Is Associated with Low Recurrence and High Function CLINICAL ORTHOPAEDICS AND RELATED RESEARCH Mohler, D. G., Chiu, R., McCall, D. A., Avedian, R. S. 2010; 468 (10): 2765-2773

    Abstract

    Chondrosarcomas of bone traditionally have been treated by wide or radical excision, procedures that may result in considerable lifelong disability. Grade 1 chondrosarcomas have little or no metastatic potential and are often difficult to distinguish from painful benign enchondromas. Curettage with adjuvant cryosurgery has been proposed as an alternative therapy for Grade 1 chondrosarcomas given the generally better function after the procedure. However, because it is an intralesional procedure, curettage and cryosurgery may be associated with higher rates of recurrence.We asked whether Grade 1 chondrosarcomas and enchondromas of uncertain malignant potential treated by curettage and cryosurgery are associated with low recurrence rates and high functional scores.We retrospectively reviewed the records of 46 patients with Grade 1 chondrosarcomas and enchondromas of uncertain malignant potential treated by curettage and cryosurgery. Forty-one patients had tumors of the long bones. Patients were followed a minimum of 18 months (average, 47.2. months; range, 18-134 months) for evidence of recurrence and for assessment of Musculoskeletal Tumor Society (MSTS) functional score.Two of the 46 patients had recurrences in the original tumor site (4.3% recurrence rate), which subsequently were removed by wide excision, and both patients were confirmed to be disease-free 36 and 30 months, respectively, after the second surgery. The mean MSTS score was 27.2 of 30 points (median, 29 points).Our observations show curettage with cryosurgery is associated with low recurrence of Grade 1 chondrosarcoma and high functional scores. Curettage with cryosurgery is a reasonable alternative to wide or radical excision as the treatment for Grade 1 chondrosarcomas, and allows for more radical surgery in the event of local recurrence.Level IV, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

    View details for DOI 10.1007/s11999-010-1445-y

    View details for Web of Science ID 000281843200028

    View details for PubMedID 20574801

  • Multiplanar Osteotomy with Limited Wide Margins: A Tissue Preserving Surgical Technique for High-grade Bone Sarcomas CLINICAL ORTHOPAEDICS AND RELATED RESEARCH Avedian, R. S., Haydon, R. C., Peabody, T. D. 2010; 468 (10): 2754-2764

    Abstract

    Limb-salvage surgery has been used during the last several decades to treat patients with high-grade bone sarcomas. In the short- and intermediate-term these surgeries have been associated with relatively good function and low revision rates. However, long-term studies show a high rate of soft tissue, implant, and bone-related complications. Multiplanar osteotomy with limited wide margins uses angled bone cuts to resect bone tumors with the goal of complete tumor removal while sparing host tissue although its impact on local recurrence is not known.We determined whether multiplanar osteotomy was associated with local recurrences, reconstruction failures, and allograft nonunions.We retrospectively reviewed the charts of six patients. Four patients had an osteosarcoma, one had a Ewing's sarcoma, and one had a chondrosarcoma. Patient and treatment factors such as age, diagnosis, percent of tumor necrosis (if applicable), margin status, and time to allograft union were recorded. In all patients, reconstruction was performed with an intercalary allograft cut to fit the residual defect. The minimum followup was 25 months (average, 39 months; range, 24-66 months).No patient experienced a local recurrence or metastasis, and all patients were alive and disease-free at the most recent followup. All allografts healed during the study period.With careful patient selection, the multiplanar osteotomy resection technique may be considered an option for treating patients with high-grade bone sarcomas, and, when compared with traditional surgical techniques, may lead to improved healing and function of the involved extremity.Level IV, therapeutic study. See the guidelines online for a complete description of levels of evidence.

    View details for DOI 10.1007/s11999-010-1362-0

    View details for Web of Science ID 000281843200027

    View details for PubMedID 20419483