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Andrew John Cosgarea, M.D.

Photo of Dr. Andrew John Cosgarea, M.D.

The Drew Family Professor of Orthopaedic Surgery in honor of Alec J. Cosgarea

Professor of Orthopaedic Surgery


Expertise: ACL Reconstruction, Arthroscopic Rotator Cuff Repair, Baseball Injuries, Elbow UCL Reconstruction, Knee Meniscus Repair, Orthopaedic Surgery, Orthopaedics, Patellar Instability Stabilization, Pediatric and Adolescent Sports Injuries, Shoulder Instability Stabilization Surgery, Shoulder Joint Dislocations, Sports Medicine, Superior Labrum Anterior and Posterior (SLAP) Lesions more

Research Interests: Knee and shoulder rehabilitation; Adolescent sports injuries; Computer simulation of knee biomechanics; ACL reconstruction; Patellofemoral disorders and treatment; Knee biomechanics; Patellofemoral instability; Throwing shoulder biomechanics; Surgical and nonsurgical treatment of sports injuries more

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Johns Hopkins Medicine - Green Spring Station
Appointment Phone: 410-583-2864

10753 Falls Road
Pavilion II Suite 215
Baltimore, MD 21093 map
Fax: 410-583-2855


Dr. Andrew Cosgarea is a professor of orthopaedic surgery at the Johns Hopkins School of Medicine. His areas of clinical expertise include sports injuries, arthroscopic rotator cuff repair, elbow UCL reconstruction, knee ACL reconstruction and meniscus repair, shoulder instability stabilization surgery, shoulder joint dislocations and labrum lesions.

Dr. Cosgarea serves as the head team physician for the Johns Hopkins University Department of Athletics and chief of the Division of Sports Medicine at the Johns Hopkins School of Medicine.

He received his undergraduate degree from the Pennsylvania State University. He earned his M.D. from Jefferson Medical College in Philadelphia, Pennsylvania. He completed his residency at the University of Rochester and performed a fellowship in sports medicine at the Johns Hopkins Hospital.

Prior to joining Johns Hopkins, Dr. Cosgarea was an assistant professor of orthopedic surgery at the Ohio State University Medical Center and an orthopedic consultant with the Ohio State Athletic Department.

Dr. Cosgarea's research interests include patellofemoral disorders and treatment, throwing shoulder biomechanics, ACL reconstruction, computer simulation of knee biomechanics, treatments for adolescent sports injuries, and knee and shoulder rehabilitation.

Dr. Cosgarea was a team physician for the Baltimore Orioles from 2000 to 2010. He was named one of the “125 Knee Surgeons and Specialist to Know” by Becker’s Spine Review in 2012. He is a member of various professional organizations, including the American Board of Orthopaedic Surgery and American Orthopaedic Society for Sports Medicine. more


  • The Drew Family Professor of Orthopaedic Surgery in honor of Alec J. Cosgarea
  • Chief, Division of Sports Medicine, Department of Orthopaedic Surgery
  • Head Team Physician, Johns Hopkins University Athletic Department
  • Professor of Orthopaedic Surgery



  • MD, Jefferson Medical College of Thomas Jefferson University (1987)


  • University of Rochester Medical Center / Orthopaedic Surgery (1992)

Board Certifications

  • American Board of Orthopaedic Surgery / Orthopaedic Sports Medicine (2010)
  • American Board of Orthopaedic Surgery / Orthopedic Surgery (1995, 2006)

Research & Publications

Research Summary

Dr. Cosgarea’s research interests involve knee biomechanics, especially the patellofemoral joint. He has worked in collaboration with biomechanical engineer John Elias, Ph.D., on a series of projects that use computational modeling to study patellofemoral realignment surgical techniques. He is also collaborating with Dr. John Carrino using a new imaging technology, dynamic CT scanning, to better analyze biomechanical parameters.

He has been involved in a series of projects exploring posterior knee anatomy. He maintains a database that tracks surgical treatment in patients with pigmented villonodular synovitis. He has studied shoulder range of motion in baseball pitchers by collecting retrospective data from the Baltimore Orioles and prospective data from the Johns Hopkins baseball teams.

Selected Publications

View all on Pubmed

  1. Zhen G, Wen C, Jia X, Li Y, Crane JL, Mears SC, Askin FB, Frassica FJ, Chang W, Yao J, Carrino JA, Cosgarea A, Artemov D, Chen Q, Zhao Z, Zhou X, Riley L, Sponseller P, Wan M, Lu WW, Cao X. "Inhibition of TGF-β signaling in mesenchymal stem cells of subchondral bone attenuates osteoarthritis." Nat Med. 2013 Jun;19(6):704-12. doi: 10.1038/nm.3143. Epub 2013 May 19.
  2. Koehler RJ, Amsdell S, Arendt EA, Bisson LJ, Braman JP, Butler A, Cosgarea AJ, Harner CD, Garrett WE, Olson T, Warme WJ, Nicandri GT. "The Arthroscopic Surgical Skill Evaluation Tool (ASSET)."Am J Sports Med. 2013 Jun;41(6):1229-37. doi: 10.1177/0363546513483535. Epub 2013 Apr 2. Erratum in: Am J Sports Med. 2013 Jul;41(7):NP38.
  3. Spiker AM, Dixit S, Cosgarea AJ. "Triathlon: running injuries." Sports Med Arthrosc. 2012 Dec;20(4):206-13. doi: 10.1097/JSA.0b013e31825ca79f. Review.
  4. Tanaka MJ, Bollier MJ, Andrish JT, Fulkerson JP, Cosgarea AJ. "Complications of medial patellofemoral ligament reconstruction: common technical errors and factors for success: AAOS exhibit selection." J Bone Joint Surg Am. 2012 Jun 20;94(12):e87. doi: 10.2106/JBJS.K.01449. Review.
  5. Saranathan A, Kirkpatrick MS, Mani S, Smith LG, Cosgarea AJ, Tan JS, Elias JJ. "The effect of tibial tuberosity realignment procedures on the patellofemoral pressure distribution." Knee Surg Sports Traumatol Arthrosc. 2012 Oct;20(10):2054-61. Epub 2011 Dec 2.

Activities & Honors


  • “125 Knee Surgeons and Specialists to Know,”, Becker’s Spine Review, 2012
  • Patellofemoral Research Excellence Award, ISAKOS 5th Biennial Congress, 2005
  • Prince Alexandre de Merode Award, Oral Presentation, Sixth IOC World Congress on Sports Sciences, 2002
  • First Place, Basic Science Presentation, Maryland Orthopaedic Association, 2000
  • Best Team Presentation, “Operative and Non-Operative Treatment of Knee Sports Injuries,”, Ohio State University, 1998 - 1999
  • Best Program, “Sports Medicine: Anterior Cruciate Ligament Injuries,”, Ohio State University, 1996 - 1997
  • Silver Reel Award, “Sports Medicine: Anterior Cruciate Ligament Injuries,”, International Television Association 29th Annual Video Festival
  • Best Clinical/Surgical Presentation Award, “Common Knee Injuries,”, Ohio State University, 1993 - 1994
  • Gold Slate Award, “Common Knee Injuries,”, International Television Association 26th Annual Video Festival
  • Honorable Mention, “Common Knee Injuries,”, New York Film Festival
  • 106 Knee Surgeons to Know | 2017, Becker's ASC Review


  • American Academy of Orthopaedic Surgeons
  • American Board of Orthopaedic Surgery
  • American Orthopaedic Society for Sports Medicine
  • Arthroscopy Association of North America
  • Herodicus Society
  • Maryland Orthopaedic Society
  • The Johns Hopkins Medical and Surgical Association

Videos & Media

Recent News Articles and Media Coverage

ACL Surgery | Michelle Baker's Story Johns Hopkins Medicine (March 2017) 

BLOG: The evaluation of patellar maltracking Healio (January 2017)

Insider: Why can't the Colts stay healthy? (September 2016)

The Most Common Injury at the Olympics, (August 2016)

Here is Why You Can (And Should) Push Through Pain in a Workout, BodyRock TV


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