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Correlation between two-dimensional video analysis and subjective assessment in evaluating knee control among elite female team handball players
  1. Silje Stensrud1,2,3,
  2. Grethe Myklebust1,
  3. Eirik Kristianslund1,
  4. Roald Bahr1,
  5. Tron Krosshaug1
  1. 1Oslo Sports Trauma Research Center, Norwegian School of Sports Sciences, Oslo, Norway
  2. 2Research Unit for Musculoskeletal Function and Physiotherapy, Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark
  3. 3Department of Orthopaedics, Oslo University Hospital, Oslo, Norway
  1. Correspondence to Silje Stensrud, Hjelp24Nimi Ullevaal, PO Box 3843 Ullevaal Stadion, 0855 Oslo, Norway; silje.stensrud{at}


Poor frontal plane knee control has been shown to be a risk factor for anterior cruciate ligament injuries in ball/team sports. It is necessary to develop simple tests that can identify players with poor knee control and among other factors be able to optimise preventive training programmes. The present study investigated the correlation between a two-dimensional (2D) video analysis and subjective assessment performed by one physiotherapist in evaluating knee control. We also tested the correlation between three simple clinical tests using both methods. A cohort of 186 female elite team handball players completed three tests: single-leg squat (SLS), single-leg vertical drop jump (SLVDJ) and two-leg vertical drop jump (VDJ). Receiver operating characteristic (ROC) analyses showed good to excellent agreement between 2D video analysis and subjective assessment for SLS and VDJ (area under the ROC curve (AUC) 0.83–0.89), but not for SLVDJ (AUC 0.65–0.76). Poor knee control was detected in 25–40% of the players using SLS and VDJ. In contrast, poor knee control was identified in less than 1% of the subjects based on the SLVDJ test. This indicates that SLVDJ may be inadequate for evaluating poor frontal plane knee control. The correlation between the SLS and VDJ tests was found to be low, suggesting that these tests identified different subjects with poor knee control. These results indicate that subjective assessment can be used to screen for poor knee control and that both SLS and VDJ tests should be used in screening athletes for poor knee control.

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  • Competing interests None.

  • Patient consent Obtained.

  • Ethics approval This study was conducted with the approval of the Norwegian Social Data Services and the Regional Committee for Medical Research Ethics.

  • Provenance and peer review Not commissioned; externally peer reviewed.