Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/10534
Title: Activation of the quadriceps muscle during semisquatting with different hip and knee positions in patients with anterior knee pain
Authors: Lam, PL
Ng, GYF 
Keywords: Electromyography
Exercise
Patella
Physical therapy
Issue Date: 2001
Publisher: Lippincott Williams & Wilkins
Source: American journal of physical medicine and rehabilitation, 2001, v. 80, no. 11, p. 804-808 How to cite?
Journal: American journal of physical medicine and rehabilitation 
Abstract: Objective: We measured the surface electromyographic activities of vastus medialis obliquus and vastus lateralis in 16 subjects with patellofemoral joint pain syndrome. Design: Each subject performed bilateral static knee extension exercises at 60% of his or her maximal voluntary effort under different combinations of hip rotation (30 degrees of medial rotation, neutral, 45 degrees of lateral rotation) and knee flexion (20 and 40 degrees) in a standing position. The ratio of surface-integrated electromyographic signals of vastus medialis obliquus over vastus lateralis was calculated for each of the six conditions. Because of significant interaction of hip rotation and knee flexion in the two-way analysis of variance, data were analyzed separately with paired t tests for the effect of knee positions and one-way repeated measures analysis of variance for hip positions. Results: At 20 degrees of knee flexion, there was no significant difference among the three hip positions, whereas at 40 degrees of knee flexion, medial rotation of the hip resulted in significantly higher vastus medialis obliquus over vastus lateralis activity ratio than lateral rotation (P < 0.05). Conclusions: There was relatively more activation of vastus medialis obliquus than vastus lateralis at 40 degrees of semisquat with the hip medially rotated by 30 degrees. This finding has clinical implications for training the vastus medialis obliquus in patients with patellofemoral joint pain syndrome.
URI: http://hdl.handle.net/10397/10534
ISSN: 0894-9115
DOI: 10.1097/00002060-200111000-00003
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