Free accessResearch articleFirst published online 2016-11
Comparison of the knee valgus angle,leg muscle activity,and vastus medialis oblique/vastus lateralis ratio during a single leg squat on flat and declined surfaces in individuals with patellofemoral pain syndrome
The knee valgus angle and knee muscles activity on a declined surface have not yet provided enough biomechanical analyses and treatment guidelines for patellofemoral pain syndrome (PFPS) patients
OBJECTIVE:
The purpose of this study was to investigate the knee valgus angle, leg muscle activity, and the vastus medialis oblique (VMO)/vastus lateralis (VL) muscles ratio during a single leg squat (SLS) on a declined surface in individuals with PFPS.
METHODS:
Fifteen young adults with PFPS (9 men, 6 women; height, 168.6 ± 7.3 cm; weight, 62.4 ± 17.9 kg; age, 22.7 ± 2.8 y; body mass index, 22.7 ± 2.8) participated in this study. Knee valgus angle and leg muscle activity and VMO/VL ratios were collected in subjects with PFPS during SLS on flat and declined surfaces.
RESULTS:
During the SLS, the knee valgus angle was significantly increased on the declined surface than the flat surface (p< 0.05). Also, significantly higher EMG activity in the rectus femoris (RF), VMO, and VL muscles when doing the SLSs were present during the SLSs on the declined surface (p< 0.05).
CONCLUSIONS:
The results of this study suggest that significantly increased knee valgus angles and muscle activity of RF, VMO, and VL during SLSs occur on a declined surface. Therefore, individuals with PFPS should be cautious when stepping down on a declined surface, such as downhill terrain on a mountain.
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