Format

Send to

Choose Destination
J Electromyogr Kinesiol. 2016 Dec;31:96-103. doi: 10.1016/j.jelekin.2016.10.004. Epub 2016 Oct 12.

The influence of knee alignment on lower extremity kinetics during squats.

Author information

1
Department of Kinesiology, University of Virginia, Charlottesville, VA, USA. Electronic address: ls4zj@virginia.edu.
2
Department of Kinesiology, University of Virginia, Charlottesville, VA, USA.

Abstract

The squat is an assessment of lower extremity alignment during movement, however there is little information regarding altered joint kinetics during poorly performed squats. The purpose of this study was to examine changes in joint kinetics and power from altered knee alignment during a squat. Thirty participants completed squats while displacing the knee medially, anteriorly, and with neutral alignment (control). Sagittal and frontal plane torques at the ankle, knee, and hip were altered in the descending and ascending phase of the squat in both the medial and anterior malaligned squat compared to the control squat. Ankle and trunk power increased and hip power decreased in the medial malaligned squat compared to the control squat. Ankle, knee, and trunk power increased and hip power decreased in the anterior malaligned squat compared to the control squat. Changes in joint torques and power during malaligned squats suggest that altered knee alignment increases ankle and trunk involvement to execute the movement. Increased anterior knee excursion during squatting may also lead to persistent altered loading of the ankle and knee. Sports medicine professionals using the squat for quadriceps strengthening must consider knee alignment to reduce ankle and trunk involvement during the movement.

KEYWORDS:

Biomechanics; Knee injury; Knee valgus; Movement assessment

PMID:
27768963
DOI:
10.1016/j.jelekin.2016.10.004
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center