Clinical Focus

  • Child and Adult Hip Preservation Surgery
  • Periacetabular Osteotomy (PAO) for Acetabular Dysplasia, Acetabular Retroversion, Coxa Protrusio
  • Hip Arthroscopy for Femoroacetabular Impingement (FAI), Labral Tears, Hip Cartilage Defects
  • Surgical Hip Dislocation
  • Pelvic and Femoral Osteotomies
  • Slipped Capital Femoral Epiphyses
  • Legg-Calve-Perthes Disease
  • Orthopaedic Surgery
  • General Surgery

Academic Appointments

Boards, Advisory Committees, Professional Organizations

  • Member, American Academy of Orthopaedic Surgeons (AAOS) (2013 - Present)
  • Member, Western Orthopaedic Association (WOA) (2014 - Present)
  • Member, California Orthopaedic Association (COA) (2014 - Present)

Professional Education

  • Fellowship:Harvard Medical School (2007) MA
  • Residency:Stanford University Hospital (2007) CA
  • Internship:Stanford University School of Medicine (2007) CA
  • Medical Education:University of California San Francisco (2007) CA
  • Undergraduate, Stanford University, CA (2003)

Current Research and Scholarly Interests

Dr. Pun specializes in the treatment of complex hip disorders with surgical hip preservation options for children, adolescents, and adults. Her goal is to enhance hip function in active individuals and to prevent the early development of hip osteoarthritis.

Her areas of expertise are acetabular dysplasia, developmental dysplasia of the hip (DDH), femoroacetabular impingement (FAI), acetabular labral tears, hip cartilage defects, slipped capital femoral epiphysis (SCFE), Perthes disease, and deformities of the pelvis and proximal femur.

She offers both arthroscopic and open hip preservation options, such as periacetabular osteotomy (PAO), pelvic and femoral osteotomies, surgical hip dislocations, and hip arthroscopy for repair of labral tears and chondral defects.

Dr. Pun received her undergraduate degree from Stanford University and medical degree from UCSF School of Medicine. She then completed the Stanford Orthopaedic Surgery Residency Program, during which she developed a profound interest in hip function and preservation. She subsequently pursued fellowship training in Hip Preservation Surgery at the world-renowned Boston Children’s Hospital and Harvard Medical School.

Dr. Pun’s research interests include advancing knowledge of the dynamic pathoanatomy in hip instability and hip impingement, defining the unique anatomy of the dysplastic acetabulum, developing new surgical techniques for improving hip function, and clinical outcomes of hip preservation surgery.

2014-15 Courses

All Publications

  • Nonarthroplasty Hip Surgery for Early Osteoarthritis RHEUMATIC DISEASE CLINICS OF NORTH AMERICA Pun, S. Y., O'Donnell, J. M., Kim, Y. 2013; 39 (1): 189-?


    The most favorable mechanical environment for the hip is one that is free of both instability and impingement, creating a concentric articulation with optimum femoral head coverage by the acetabulum. Anatomic variations such as acetabular dysplasia with associated instability, and femoroacetabular impingement with abnormal constraint, will lead to abnormal joint mechanics, articular damage, and osteoarthritis. Surgical techniques such as periacetabular osteotomies, and femoral and acetabular osteoplasties enable correction of anatomic variations that cause mechanical damage to the hip joint, thereby potentially preventing or delaying development of osteoarthritis and subsequent need for joint replacement.

    View details for DOI 10.1016/j.rdc.2012.11.004

    View details for Web of Science ID 000315170300011

    View details for PubMedID 23312416

  • Reconstruction of both the medial and lateral collateral ligaments in the elbow using a single graft: a new technique of reconstruction. Techniques in Shoulder & Elbow Surgery Pun, S. Y., Safran, M. R. 2012; 13 (1): 6-10
  • Effect of bupivacaine on chondrocyte viability. spine journal Dragoo, J. L., Pun, S. Y. 2010; 10 (2): 172-173

    View details for DOI 10.1016/j.spinee.2009.11.015

    View details for PubMedID 20142073

  • Effect of Gender and Preoperative Diagnosis on Results of Revision Total Knee Arthroplasty CLINICAL ORTHOPAEDICS AND RELATED RESEARCH Pun, S. Y., Ries, M. D. 2008; 466 (11): 2701-2705


    Recent studies question an effect of gender on outcome of primary TKA. We questioned whether the results of revision TKA were affected by gender. We separated 67 revision TKAs by gender and preoperative diagnosis into four groups (arthrofibrosis, infection, instability, and wear and loosening). Each revision TKA was individually matched by age and gender to two primary TKAs. Postoperative Knee Society pain and function scores after revision TKA were lower than for primary TKA for both females and males. However, postoperative Knee Society pain and function scores were similar in males and females. Postoperative pain and function scores were lower for all revision groups compared with primary TKA, except for pain and function scores after revision for instability. Postoperative pain and function scores were higher for instability and wear or loosening than for arthrofibrosis. Our data suggest the results of revision TKA are affected by preoperative diagnosis but not gender.Level III, retrospective matched cohort study. See Guidelines for Authors for a complete description of levels of evidence.

    View details for DOI 10.1007/s11999-008-0451-9

    View details for Web of Science ID 000259909000021

    View details for PubMedID 18726656

  • Periodic rewetting enhances the viability of chondrocytes in human articular cartilage exposed to air JOURNAL OF BONE AND JOINT SURGERY-BRITISH VOLUME Pun, S. Y., Teng, M. S., Kim, H. T. 2006; 88B (11): 1528-1532


    Desiccation of articular cartilage during surgery is often unavoidable and may result in the death of chondrocytes, with subsequent joint degeneration. This study was undertaken to determine the extent of chondrocyte death caused by exposure to air and to ascertain whether regular rewetting of cartilage could decrease cell death. Macroscopically normal human cartilage was exposed to air for 0, 30, 60 or 120 minutes. Selected samples were wetted in lactated Ringer's solution for ten seconds every ten or 20 minutes. The viability of chondrocytes was measured after three days by Live/Dead staining. Chondrocyte death correlated with the length of exposure to air and the depth of the cartilage. Drying for 120 minutes caused extensive cell death mainly in the superficial 500 microm of cartilage. Rewetting every ten or 20 minutes significantly decreased cell death. The superficial zone is most susceptible to desiccation. Loss of superficial chondrocytes likely decreases the production of essential lubricating glycoproteins and contributes to subsequent degeneration. Frequent wetting of cartilage during arthrotomy is therefore essential.

    View details for DOI 10.1302/0301-620X.88B11.18091

    View details for Web of Science ID 000242303100023

    View details for PubMedID 17075104

  • Utilization of medical acupuncture at the Stanford University Complementary Medicine Clinic: a two-year retrospective study. Medical Acupuncture Fredericson, M., Pun, S., Nelson, L., Speigel, D. 2002; 13 (3)