Alan Zhang, MD
Associate Professor
Department of Orthopaedic Surgery
Director, Sports Medicine and Shoulder Surgery Fellowship
Director, Hip Preservation Center
University of California, San Francisco
San Francisco, CA
Dr. Alan Zhang is a board-certified orthopaedic surgeon and Associate Professor in the Department of Orthopaedic Surgery at the University of California, San Francisco. He is the Director of the UCSF Sports Medicine and Shoulder Surgery Fellowship and the Director of the Hip Preservation Center. Dr. Zhang is a specialist in hip arthroscopy procedures for labral repair and reconstruction as well as femoroacetabular impingement. He specializes in treatment of ACL tears, meniscus tears, and cartilage injuries in the knee, and rotator cuff tears, labral tears, instability, and biceps injuries in the shoulder.
His research is focused on patient reported outcomes after surgery and utilizing quantitative magnetic resonance imaging to detect early articular cartilage injuries. He is a member of the MOON Shoulder Group and has published over 100 peer-reviewed articles while receiving multiple research awards and grants.
Dr. Zhang is a team physician for the University of San Francisco and an active member of the American Academy of Orthopaedic Surgeons, American Orthopaedic Society for Sports Medicine, Arthroscopy Association of North America, Orthopaedic Research Society, and International Society for Hip Arthroscopy. He serves on the Council of Delegates for the AOSSM and committees for the AOSSM and AAOS. After graduating Summa Cum Laude from Rice University, he obtained his medical degree from the University of California San Diego School of Medicine and was inducted into the Gold Humanism Honor Society. Dr. Zhang completed residency training in Orthopaedic Surgery at UCLA Medical Center followed by a fellowship in Sports Medicine and Shoulder Surgery at UCSF.
Selected Published Work
Nguyen TQ, Friedman JM, Flores SE, Zhang AL. Fast Starters and Slow Starters After Hip Arthroscopy for Femoroacetabular Impingement: Correlation of Early Postoperative Pain and 2-Year Outcomes. Am J Sports Med. 2020;48(12):2903-2909.
Chambers CC, Monroe EJ, Flores SE, Borak KR, Zhang AL. Periportal Capsulotomy: Technique and Outcomes for a Limited Capsulotomy During Hip Arthroscopy. Arthroscopy. 2019;35(4):1120-1127.
Shaw C, Warwick H, Nguyen KH, Link TM, Majumdar S, Souza RB, Vail TP, Zhang AL. Correlation of Hip Capsule Morphology with Patient Symptoms from Femoroacetabular Impingement. J Orthop Res. 2020 Jun 27;. doi: 10.1002/jor.24788.
Hodax JD, Flores SE, Cheung EC, Zhang AL. Use of Air Arthrograms to Aid in Joint Distraction During Hip Arthroscopic Surgery Decreases Postoperative Pain and Opioid Requirements. Orthop J Sports Med. 2019;7(4):2325967119837389.
Flores SE, Chambers CC, Borak KR, Zhang AL. Is There a Gender Gap in Outcomes After Hip Arthroscopy for Femoroacetabular Impingement? Assessment of Clinically Meaningful Improvements in a Prospective Cohort. Orthop J Sports Med. 2020;8(7):2325967119900561.
Flores SE, Sheridan JR, Borak KR, Zhang AL. When Do Patients Improve After Hip Arthroscopy for Femoroacetabular Impingement? A Prospective Cohort Analysis. Am J Sports Med. 2018;46(13):3111-3118.
Grace TR, Choo KJ, Patterson JT, Khanna K, Feeley BT, Zhang AL. A Review of Inpatient Opioid Consumption and Discharge Prescription Patterns After Orthopaedic Procedures. J Am Acad Orthop Surg. 2020;28(7):279-286.
Cheung EC, Moore LK, Flores SE, Lansdown DA, Feeley BT, Zhang AL. Correlation of PROMIS with Orthopaedic Patient-Reported Outcome Measures. JBJS Rev. 2019;7(8):e9.
Rubenstein WJ, Lansdown DA, Feeley BT, Ma CB, Zhang AL. The Impact of Body Mass Index on Complications After Shoulder Arthroscopy: Should Surgery Eligibility Be Determined by Body Mass Index Cutoffs? Arthroscopy. 2019;35(3):741-746.
Grace T, Neumann J, Samaan MA, Souza RB, Majumdar S, Link TM, Zhang AL. Using the Scoring Hip Osteoarthritis with Magnetic Resonance Imaging (SHOMRI) System to Assess Intra-articular Pathology in Femoroacetabular Impingement. J Orthop Res. 2018;36(11):3064-3070.
Rugg CM, Hettrich CM, Ortiz S, Wolf BR; MOON Shoulder Instability Group, Zhang AL. Surgical stabilization for first-time shoulder dislocators: a multicenter analysis. J Shoulder Elbow Surg. 2018;27(4):674-685.
Duchman KR, Hettrich CM, Glass NA, Westermann RW; MOON Shoulder Group, Wolf BR, Baumgarten K, Bishop J, Bravman J, Brophy R, Carpenter J, Jones G, Kuhn J, Benjamin Ma C, Marx R, McCarty E, Miller B, Smith M, Eric M, Miller B, Smith M, Wright R, Zhang A. The Incidence of Glenohumeral Bone and Cartilage Lesions at the Time of Anterior Shoulder Stabilization Surgery: A Comparison of Patients Undergoing Primary and Revision Surgery. Am J Sports Med. 2018;46(10):2449-2456.
Behrends M, Yap EN, Zhang AL, Kolodzie K, Kinjo S, Harbell MW, Aleshi P. Preoperative Fascia Iliaca Block Does Not Improve Analgesia after Arthroscopic Hip Surgery, but Causes Quadriceps Muscles Weakness: A Randomized, Double-blind Trial. Anesthesiology. 2018;129(3):536-543.
Zhang AL, Sing DC, Dang DY, Ma CB, Vail TP, Feeley BF. Overlapping Surgery in the Ambulatory Orthopaedic Setting. J Bone Joint Surg Am. 2016;98(22):1859-1867.Zhang AL. Overlapping Surgery- Perspectives From the Other Side of the Table. JAMA Intern Med. 2018;178(1):83-84.
Samuel Karel Van de Velde, MD, MPH, PhD
Assistant Professor of Orthopedic Surgery
Columbia University Medical Center
New York City, NY
Samuel Karel Van de Velde, MD, MPH, PhD, is a pediatric orthopedic surgeon with NewYork-Presbyterian Brooklyn Methodist Hospital. He is an Assistant Professor of Orthopedic Surgery at Columbia University Irving Medical Center.
Dr. Van de Velde has received specialized pediatric orthopaedic training in Australia, Canada, and the United States. He treats all aspects of the lower limb, including child and young adult hip preservation, sports pathology of the hip and knee, and foot and ankle deformities.
After medical school in Louvain, Belgium, Dr. Van de Velde joined the Bioengineering Laboratory at the Massachusetts General Hospital, Boston, MA, where he studied the biomechanical pathogenesis of osteoarthritis in patients with cruciate ligament deficiency. This NIH-funded investigation was commemorated with a PhD in Medical Sciences at the University of Leiden, the Netherlands. While in Boston, Dr. Van de Velde obtained a master’s degree from the Harvard School of Public Health, received the Ruth L. Kirschstein Award from the NIH, and won the O’Donoghue Sports Injury Award together with Thomas J. Gill, IV, MD. He has published more than 50 peer-reviewed articles and has presented his research at numerous annual medical conferences and symposiums both nationally and internationally.
Dr. Van de Velde did his orthopaedic surgical training at Leiden University Medical Center, the Netherlands. He then visited the Royal Children’s Hospital Melbourne, Australia, followed by a one-year clinical fellowship in pediatric orthopaedic surgery at the Hospital for Sick Children in Toronto, Canada. After the general pediatric orthopaedic training, Dr. Van de Velde completed one year of training in the diagnosis and specialized treatment of hip and knee pathology in children and young adults in Perth, Australia. Surgical treatments included periacetabular and femoral osteotomy, surgical dislocation and femoral capital realignment, hip arthroscopy and hip joint replacement, and knee ligament reconstruction. In addition to the joint preservation fellowship, Dr. Van de Velde participated in two medical missions to the Comoros Islands in Africa. During these missions he performed complex limb alignment and corrective surgeries while training local providers in the developing world in the Ponseti method for clubfoot deformity. Finally, Dr. Van de Velde received extensive training in the treatment of complex pediatric foot and ankle deformities and malformations during his fellowship training at Seattle Children’s Hospital in Seattle, Washington.
He lives with his wife and three children on Park Slope in Brooklyn, NY.
Selected Published Work
Van de Velde S, Fillman R, Yandow S: Current Concepts – Protrusio Acetabuli in Marfan Syndrome: History, Diagnosis, and Treatment. J Bone Joint Surg Am. 2006;88(3):639-646.
Van de Velde SK, Gill TJ, DeFrate LE, Papannagari R, Li G: The effect of anterior cruciate ligament deficiency and reconstruction on the patellofemoral joint. Am J Sports Med. 2008;36(6):1150-1159.
Li G, Van de Velde SK, and Bingham JT: Validation of a Non-invasive Fluoroscopic Imaging Technique for the Measurement of Dynamic Knee Joint Motion. J Biomech. 2008;41(7):1616-1622.
Van de Velde SK, Bingham JT, Gill TJ, Li G: Analysis of tibiofemoral cartilage deformation in the posterior cruciate ligament-deficient knee. J Bone Joint Surg Am. 2009;91(1):167-175.
Van de Velde SK, Bingham JT, Hosseini A, Kozanek M, DeFrate LE, Gill TJ, Li G: Increased in-vivo tibiofemoral cartilage contact deformation in anterior cruciate ligament-deficiency. Arthritis Rheum. 2009;60(12):3693-3702.
Kornaat PR, Van de Velde SK. Bone Marrow Edema Lesions in the Professional Athlete. Am J Sports Med. 2014;42(5):1242-1246.
Van de Velde SK, Kernkamp WA, Hosseini A, LaPrade RF, van Arkel E, Li G. In Vivo Length Change of the Anterolateral Ligament and Related Extra-Articular Reconstructions. Am J Sports Med. 2016;44(10):2557-2562.
Kernkamp WA, Van de Velde SK, van Arkel ERA, Asnis PD, Zarins B, LaPrade RF, Nelissen RGHH, Li G. An In-vivo Simulation on Isometry of the Anterolateral Aspect of the Knee. J Bone Joint Surg Am. 2017;99(13):1111-1118.
Van de Velde SK, Loh B, Donnan L. Total hip arthroplasty in patients 16 years of age or younger. J Child Orthop. 2017;11(6):428-433.
Kernkamp WA, Wang C, Li C, Hu H, van Arkel ERA, Nelissen RGHH, LaPrade RF, Van de Velde SK, Tsai TY. The Medial patellofemoral ligament is a dynamic and anisometric structure: an in vivo study on length changes and isometry. Am J Sports Med. 2019;47(7):1645-1653.
American Journal of Sports Medicine Editorial Board Spotlight 