• Journal of biomechanics · Oct 2017

    Case Reports

    Sprint mechanics return to competition follow-up after hamstring injury on a professional soccer player: A case study with an inertial sensor unit based methodological approach.

    • Igor Setuain, Pablo Lecumberri, and Mikel Izquierdo.
    • Public University of Navarra, Department of Health Sciences, Tudela, Spain; TDN, Orthopaedic Surgery and Advanced Rehabilitation, Pamplona, Spain. Electronic address: igorsetuain@gmail.com.
    • J Biomech. 2017 Oct 3; 63: 186-191.

    BackgroundThe present research aimed to describe an inertial unit (IU)-based sprint mechanics evaluation model for assessing players' readiness to return to competition after suffering a grade I hamstring injury.MethodsA professional male football player (age 19years; height 177cm; weight 70kg, midfielder, Spanish, 3° Division) with a grade 1 biceps femoris injury was evaluated at pre-season, at return to play after injury and at the end of the competitive season. Sprint mechanics were analyzed via the use of an inertial orientation tracker (Xsens Technologies B.V. Enschede, Netherlands) attached over the L3-L4 region of the subject's lumbar spine. Sprint mechanics such as horizontal components of ground reaction force were assessed in both legs during sprinting actions. Findings and interpretation: Both the coefficient of the horizontal force application (SFV) and the ratio of forces (DRF) applied at increasing velocity were decreased in the injured limb compared with the contralateral healthy limb at the return to play evaluation (73% and 76% reductions, respectively) and returned to symmetrical levels at the end-season evaluation.Copyright © 2017 Elsevier Ltd. All rights reserved.

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