Dynamic knee valgus and limb asymmetry have been linked to greater risk of anterior cruciate ligament (ACL) or patellofemoral joint (PFJ) injury. Two-dimensional (2D) frontal plane projection angle (FPPA)is more clinically useful than three-dimensional (3D) motion analysis techniques used to assess dynamic knee valgus in the literature. Further, hop for distance tests and the star excursion balance test (SEBT)offer a clinically useful assessment of limb symmetry. 1. Reliability and validity of 2D FPPA Within-day and between-session reliability of 2D FPPA during the drop jump (DJ), single leg land (SLL) and single leg squat (SLS) tasks was fair to good.Intra-and inter-tester reliability was excellent. Significant correlations were found between 2D FPPA and 3D measures of dynamic knee valgus . These re sults indicate that 2D FPPA is a reliable and valid measure of dynamic knee valgus. 2. Reliability of hop for distance tests and the SEBT Between - session reliability of the hop for distance tests and SEBT was good. Error measurement v alues were calculated to evaluate future performance . 3. Investigation of factors contributing to 2D FPPA Significant correlations were found between DJ FPPA and isometric hip abduction, external rotation and combined abduction/external rotation (clam) strength. Clam strength accounted for 20% of the variance in 2D FPPA. No significant correlations were found for SLL FPPA. 4. Use of feedback to modify movement patterns Augmented feedback was shown to significantly improve landing patterns during the drop DJ and SLL tasks. In the DJ task a significant reduction in FPPA and increase in contact time were found post - feedback. A significant reduction in FPPA and vertical ground reaction forces were found for the SLL task. 5. Prospective assessment of ACL injury risk in women’s sport One women’s footballer suffered an ACL injury and was found to demonstrate greater FPPA during the DJ, SLL and SLS tasks and lower crossover hop for distance scores than her peers. Limb asymmetry did not appear to predict ACL injury risk in this athlete.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:588718 |
| Date | January 2013 |
| Creators | Munro, A. G. |
| Publisher | University of Salford |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://usir.salford.ac.uk/30236/ |
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