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Full length article| Volume 16, ISSUE 5, P424-430, June 01, 2001

Patellofemoral joint kinetics during squatting in collegiate women athletes

  • George J. Salem
    Correspondence
    Corresponding author
    Affiliations
    Musculoskeletal Biomechanics Research Laboratory, Department of Biokinesiology and Physical Therapy, University of Southern California, 1540 E. Alcazar Street, CHP-155, Los Angeles, CA 90033, USA
    Search for articles by this author
  • Christopher M. Powers
    Affiliations
    Musculoskeletal Biomechanics Research Laboratory, Department of Biokinesiology and Physical Therapy, University of Southern California, 1540 E. Alcazar Street, CHP-155, Los Angeles, CA 90033, USA
    Search for articles by this author
DOI:https://doi.org/10.1016/S0268-0033(01)00017-1
Patellofemoral joint kinetics during squatting in collegiate women athletes
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      Abstract

      Objective. To characterize the biomechanics of the patellofemoral joint during squatting in collegiate women athletes.
      Design. Repeated measures experimental design.
      Background. Although squatting exercises are required components of most intercollegiate resistance-training programs and are commonly performed during rehabilitation, the effects of various squatting depths on patellofemoral joint stress have not been quantified.
      Methods. Anthropometric data, three-dimensional knee kinematics, and ground reaction forces were used to calculate the knee extensor moment (inverse dynamics approach) in five intercollegiate female athletes during squatting exercise at three different depths (approximately 70°, 90° and 110° of knee flexion). A biomechanical model of the patellofemoral joint was used to quantify the patellofemoral joint reaction force and patellofemoral joint stress during each trial.
      Results. Peak knee extensor moment, patellofemoral joint reaction force and patellofemoral joint stress did not vary significantly between the three squatting trials.
      Conclusions. Squatting from 70° to 110° of knee flexion had little effect on patellofemoral joint kinetics. The relative constancy of the patellofemoral joint reaction force and joint stress appeared to be related to a consistent knee extensor moment produced across the three squatting depths.Relevance
      The results of this study do not support the premise that squatting to 110° places greater stress on the patellofemoral joint than squatting to 70°. These findings may have implications with respect to the safe design of athletic training regimens and rehabilitation programs.

      Keywords

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      Article Info

      Publication History

      Accepted: February 13, 2001
      Received: September 6, 2000

      Identification

      DOI: https://doi.org/10.1016/S0268-0033(01)00017-1

      Copyright

      © 2001 Elsevier Science Ltd. Published by Elsevier Inc. All rights reserved.

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