Dr. Blumenfeld is a board-certified, fellowship-trained orthopaedic surgeon with a clinical focus on primary and revision hip and knee joint replacement surgery. He is a clinical associate professor of orthopaedic surgery at Stanford University School of Medicine.

Dr. Blumenfeld has performed more than 4,000 knee and hip replacement procedures. His expert technique, comprehensive experience, and careful attention to detail enable him to excel at both first-time and revision procedures. Over the course of his career, he has achieved and maintained a complication rate well below the national average.

He listens empathetically to all patients, seeking to understand the impact their condition has on their daily activities. He prepares a personalized treatment plan that corresponds to the needs of each patient.

In every case, Dr. Blumenfeld’s treatment goals are to help relieve pain, enhance function, and improve quality of life. He seeks to assure even firsttime patients that he is committed to helping them fully understand both their diagnosis and recommended treatment, as well as timeframe for recovery.

All patients follow-up at regular intervals for clinical and X-ray evaluations following surgery. Dr. Blumenfeld encourages patients to visit him at least once every two years for a preventive care evaluation.

In addition to delivering clinical care, Dr. Blumenfeld conducts extensive research. He has been a principal investigator on clinical trials of new hip replacement systems. He was also a clinical investigator testing a robotic surgical system for total hip arthroplasty procedures. The team that developed this breakthrough received the prestigious Computerworld Smithsonian Award for Innovation in the Arts and Sciences for Medicine. As a pioneer in robotic surgery, Dr. Blumenfeld selectively uses computer-aided navigation technology for planning and performing surgical procedures.

Most recently, Dr. Blumenfeld’s research has focused on how to help surgeons reduce complication rates. He is actively investigating how the long termcost of hip and knee replacement procedures may vary depending on how early a patient¬ is diagnosed and treated.

He has authored dozens of articles on advanced surgical techniques for hip and knee arthroplasty, new materials for surgical implants, prevention of surgery-related infection, and other topics. His work has appeared in publications including Clinical Orthopaedics and Related Research, Journal of Arthroplasty, the Journal of Bone and Joint Surgery, Hip International, and others. In addition to authoring book chapters on primary and revision hip replacement surgery, Dr. Blumenfeld has written a book that shares his perspective on managed care and physician-patient communication.

He serves on the editorial boards of the Journal of Arthroplasty, Arthroplasty Today, and Clinical Orthopaedics and Related Research and is CME editor for Arthroplasty Today. He has been a member of the Adult Reconstruction–Knee Program Subcommittee and Hip Program Subcommittee for the Annual Meeting of the American Academy of Orthopedic Surgeons.

Dr. Blumenfeld has given presentations on advances in joint replacement surgery at the American Association of Hip and Knee Surgeons Annual Meeting, American Academy of Orthopedic Surgeons Annual Meeting, and other conferences.

Clinical Focus

  • Orthopaedic Surgery

Academic Appointments

Professional Education

  • Medical Education: Tufts University School of Medicine (1990) MA
  • Board Certification: American Board of Orthopaedic Surgery, Orthopaedic Surgery (1998)
  • Fellowship: Sutter Medical Center - UC Davis (1996) CA
  • Residency: Tufts Medical Center Orthopaedic Surgery Residency (1995) MA
  • Internship: Santa Barbara Cottage Hospital (1991) CA

All Publications

  • How Prescient Can We Be? Commentary on an article by Cody C. Wyles, MD, et. al.: "Creation of a Total Hip Arthroplasty Patient-Specific Dislocation Risk Calculator" JOURNAL OF BONE AND JOINT SURGERY-AMERICAN VOLUME Blumenfeld, T. J. 2022; 104 (12)
  • Long-Term Results of Delta Ceramic-on-Ceramic Total Hip Arthroplasty. Arthroplasty today Blumenfeld, T. J., Politi, J., Coker, S., O'Dell, T., Hamilton, W. 1800; 13: 130-135


    Background: Ceramic-on-ceramic (COC) bearings in total hip arthroplasty (THA) have long been considered the coupling with the lowest overall wear. However, concerns about complications such as ceramic breakage and noise, combined with the improved performance of polyethylene, have limited its use in the United States. This postapproval follow-up reports long-term (10 years) results of Delta COC in THA patients primarily enrolled in an Investigational Device Exemption study.Methods: Patients received Delta COC THA in a prospective multicenter study with either 28-mm (N=105 hips in 104 patients) or 36-mm (N= 81) articulations. Annual clinical and radiographic evaluations were performed for years 5 to 10, and study patients were asked about hip noises and reproducibility.Results: There have been 4 additional reports of noise in 4 patients (COC 28, n= 3; COC 36, n= 1). The cumulative incidence rate for squeaking or noise at 10 years is 5.9% for COC 28 and 13.5% for COC 36. There have been 2 additional reports of dislocation in 2 patients (COC 28, n= 1; COC 36, n= 1). The cumulative incidence rate for dislocation at 10 years is 3.7% for COC 28 and 3.5% for COC 36. At 10 years, there were greater than 40 hips available for follow-up. At mean 10-year follow-up, there were a total of 3 ceramic liner fractures, but none since the previous report. There were no revisions in the 28-mm cohort, and 2 revisions in the 36-mm cohort (1 for recurrent dislocation and 1 for pain and noise). Overall Kaplan-Meier survivorship was 95.96% at 10.5 years (28 mm: 97.68% at 10.2 years; 36 mm: 94.11% at 10.4 years.).Conclusions: At 10-year follow-up, we report excellent results in regard to survivorship, with one patient revised for pain with associated squeaking.

    View details for DOI 10.1016/j.artd.2021.11.006

    View details for PubMedID 35106349

  • CORR Insights(R): Collection and Reporting of Patient-reported Outcome Measures in Arthroplasty Registries: Multinational Survey and Recommendations. Clinical orthopaedics and related research Blumenfeld, T. J. 2021

    View details for DOI 10.1097/CORR.0000000000001918

    View details for PubMedID 34415705