Andrew John Cosgarea, M.D.

Headshot of Andrew John Cosgarea
  • The Drew Family Professor of Orthopaedic Surgery in honor of Alec J. Cosgarea
  • Professor of Orthopaedic Surgery


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 Lesions (SLAP), Tear - Anterior Cruciate Ligament (ACL) 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: 410-847-3735
10803 Falls Road
Pavilion III, Suite 2100
Lutherville, MD 21093 map


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

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

Currently serving as the head team physician for the Johns Hopkins University Department of Athletics, he is a former chief of the Division of Sports Medicine at the Johns Hopkins Department of Orthopaedic Surgery.

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.

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

He earned his medical degree 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. more


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

Departments / Divisions



  • MD; Sidney Kimmel Medical College of Thomas Jefferson University (1987)


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


  • Sports Medicine; Johns Hopkins University School of Medicine (1993)

Board Certifications

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

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

D'Amore T, Tanaka MJ, Cosgarea AJ. When and how far to move the tibial tuberosity in patients with patellar instability. Sports Med Arthrosc. 2017 Jun;25(2):78-84. PMID: 28459750 

Tanaka MJ, Elias JJ, Williams AA, Demehri S, Cosgarea AJ. Characterization of patellar maltracking using dynamic kinematic CT imaging in patients with patellar instability. Knee Surg Sports Traumatol Arthrosc. 2016 Nov;24(11):3634-3641. Epub 2016 Jun 29. PMID: 27358051

Elias JJ, Soehnlen NT, Guseila LM, Cosgarea AJ. Dynamic tracking influenced by anatomy in patellar instability. Knee. 2016 Jun;23(3):450-5. doi: 10.1016/j.knee.2016.01.021. Epub 2016 Feb 26. PMID: 26922799

Williams AA, Elias JJ, Tanaka MJ, Thawait GK, Demehri S, Carrino JA, Cosgarea AJ. The Relationship Between Tibial Tuberosity-Trochlear Groove Distance and Abnormal Patellar Tracking in Patients With Unilateral Patellar Instability. Arthroscopy. 2016 Jan;32(1):55-61. doi: 10.1016/j.arthro.2015.06.037. Epub 2015 Oct 4. PMID: 26440373

Demehri S, Thawait GK, Williams AA, Kompel A, Elias JJ, Carrino JA, Cosgarea AJ. Imaging characteristics of contralateral asymptomatic patellofemoral joints in patients with unilateral instability. Radiology. 2014 Dec;273(3):821-30. doi: 10.1148/radiol.14140295. Epub 2014 Aug 22. PMID: 25153158

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

Play Video:

Meniscus Injuries | Q&A with Dr. Andrew Cosgarea

Recent News Articles and Media Coverage

History of second Tommy John surgeries raises questions about Mike Clevinger’s futureThe San Diego Union-Tribune (November 2020)

Running and aging usually don't mix. But at 62, quitting isn't an option for me. | The Washington Post (May 2019)

3 ACL Tears Won’t Keep Creighton’s Martin Krampelj off Court | AP News (October 2018)

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)

Patient Ratings & Comments

The Patient Rating score is an average of all responses to physician related questions on the national CG-CAHPS Medical Practice patient experience survey through Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are also gathered from our CG-CAHPS Medical Practice Survey through Press Ganey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

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