• Brandon J Erickson, Peter N Chalmers, John D'Angelo, Kevin Ma, Christopher S Ahmad, Joshua S Dines, and Anthony A Romeo.
• Rothman Orthopaedic Institute, New York, New York, USA.
• Am J Sports Med. 2019 Apr 1; 47 (5): 1111-1116.

BackgroundUlnar collateral ligament reconstruction (UCLR) is a successful procedure among professional baseball pitchers. It is unclear if hamstring tendon harvest side for UCLR affects the outcome or alters the risk for subsequent hamstring injury.HypothesisPlayers with prior UCLR with ipsilateral (drive leg) hamstring autograft will have the same return-to-sport (RTS) rate and performance upon RTS but a higher number of subsequent lower extremity injuries than those with contralateral (landing leg) hamstring autograft.Study DesignCohort study; Level of evidence, 3.MethodsAll players between 2010 and 2015 who underwent UCLR with hamstring autograft were included. Surgical details of their procedures were recorded from operative reports. Outcomes for UCLR with hamstring autograft harvested from the drive leg were compared with UCLR with the graft harvested from the landing leg.ResultsOverall, 191 players underwent UCLR with hamstring autograft (drive leg, n = 58, 30%; landing leg, n = 133, 70%). The docking technique was more common in the drive leg group, while the figure-of-8 technique was more common in the landing leg group ( P > .001). More patients in the landing leg group underwent concomitant treatment of the ulnar nerve than the drive leg group ( P < .001). No difference existed in RTS rates or timing of RTS between groups. No differences in subsequent ipsilateral or contralateral hamstring injuries occurred between players who underwent UCLR with hamstring autograft from the drive leg or the landing leg ( P≥ .999 and P = .460, respectively). No difference in overall upper or lower extremity injury rates existed between groups (all P > .05), and no difference in performance metrics existed between groups upon RTS.ConclusionNo difference in RTS rate, performance upon RTS, or subsequent injury rates (hamstring, lower extremity, or upper extremity) existed between players who underwent UCLR with hamstring autograft whether the graft came from the drive or the landing leg.

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