July Featured Author

Glenn S. Fleisig, PhD
Research Director, American Sports Medicine Institute
Birmingham, Alabama

From the July issue: Return to Play and Decreased Performance After Anterior Cruciate Ligament Reconstruction in National Football League Defensive Players

Podcast: Listen to Dr. Fleisig discuss his article in the July issue.


Dr. Glenn S. Fleisig, Ph.D., is the Research Director of the American Sports Medicine Institute (ASMI). Fleisig earned his B.S. in mechanical engineering from MIT, MS in mechanical engineering from Washington University, and PhD in biomedical engineering from UAB. After a research internship at the U.S. Olympic Training Center, Fleisig was hired in 1987 by the newly founded American Sports Medicine Institute to head up the research division, a position he has held for 30 years.

In addition to his work at ASMI, Dr. Fleisig is an adjunct professor at UAB and serves as chair of the USA Baseball Medical & Safety Advisory Committee, injury research advisor for Major League Baseball, safety consultant for Little League Baseball, and board member for Motus Global.

Selected Other Published Work in AJSM

Dugas JR, Walters BW, Beason DP, Fleisig GS, Chronister JE: Biomechanical comparison of ulnar collateral ligament repair with internal bracing versus modified jobe reconstruction, Am J Sports Med 44(3):735-741, 2015.

Wilk KE, Macrina LC, Fleisig GS, Aune KT, Porterfield RA, Harker P, Evans TJ, Andrews JR. Deficits in glenohumeral passive range of motion increase risk of shoulder injury in professional baseball pitchers: a prospective study. Am J Sports Med 43(10):2379-2385, 2015.

Conte SA, Fleisig GS, Dines JS, Wilk KE, Aune KT, Patterson-Flynn N, ElAttrache N. Prevalence of ulnar collateral ligament surgery in professional baseball players. Am J Sports Med 43(7):1764-1769, 2015.

Fleisig GS, Leddon CE, Laughlin WA, Ciccotti MG, Mandelbaum BR, Aune KT, Escamilla RF, MacLeod TD, Andrews JR. Biomechanical performance of baseball pitchers with a history of ulnar collateral ligament reconstruction. Am J Sports Med 43(5):1045-1050, 2015.

Scillia AJ, Aune KT, Andrachuk JS, Cain EL, Dugas JR, Fleisig GS, Andrews JR. Return to play after chondroplasty of the knee in national football league athletes. Am J Sports Med 43(3):663-668, 2015.

Laughlin WA, Fleisig GS, Scillia AJ, Aune KT, Cain EL, Dugas JR. Deficiencies in pitching biomechanics in baseball players with a history of SLAP repair. Am J Sports Med 42(12):2837-2841, 2014.

Meisterling SW, Cain EL, Fleisig GS, Hartzell JL, Dugas JR. Return to athletic activity after plate fixation of displaced midshaft clavicle fractures. Am J Sports Med 41(11):2632-2636, 2013.

Dugas JR, Bilotta J, Watts CD, Crum JA, Fleisig GS, McMichael CS, Cain EL Jr, Andrews JR. Ulnar collateral ligament reconstruction with gracilis tendon in athletes with intraligamentous bony excision: technique and results. Am J Sports Med 40(7):1578-1582, 2012.

Fleisig GS, Andrews JR, Cutter GR, Weber A, Loftice J, McMichael C, Hassell N, Lyman S. Risk of Serious Injury for Young Baseball Pitchers: A 10-Year Prospective Study. Am J Sports Med 39(2):253-257, 2011.

Robb AJ, Fleisig GS, Wilk K, Macrina L, Bolt B, Pajaczkowski J. Passive ranges of motion of the hips and their relationship with pitching biomechanics and ball velocity in professional baseball pitchers. Am J Sports Med 38(12):2487-2493, 2010.

Shah VM, Andrews JR, Fleisig GS, McMichael CS, Lemak LJ. Return to play after anterior cruciate ligament reconstruction in national football league athletes. Am J Sports Med 38(11):2233-2239, 2010.

Dun S, Loftice J, Fleisig GS, Kingsley D, Andrews JR. A Biomechanical Comparison of Youth Baseball Pitches: Is the Curveball Potentially Harmful? Am J Sports Med 36(4):686-692, 2008.

Wilk KE, Escamilla RF, Fleisig GS, Barrentine SW, Andrews JR, Boyd ML. The comparison of tibiofemoral joint forces and electromyography during open and closed kinetic chain exercises. The American Journal of Sports Medicine 24(4):518-527, 1996.

Fleisig GS, Andrews JR, Dillman CJ, Escamilla RF. Kinetics of baseball pitching with implications about injury mechanisms. The American Journal of Sports Medicine 23(2):233-239, 1995.

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