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Arch Phys Med Rehabil. 2008 Jul;89(7):1323-8. doi: 10.1016/j.apmr.2007.11.048.

Muscle strength and flexibility characteristics of people displaying excessive medial knee displacement.

Author information

1
Department of Exercise and Sports Science, University of North Carolina, Chapel Hill, NC 27599-8700, USA. bell@email.unc.edu

Abstract

OBJECTIVE:

To determine differences in strength and range of motion (ROM) between participants who exhibit medial knee displacement (MKD) during a squat that is corrected by a heel lift and those who do not.

DESIGN:

Case control.

SETTING:

Sports medicine research laboratory.

PARTICIPANTS:

Thirty-seven healthy subjects (control, 19; MKD, 18) with no lower-extremity injury in the past 6 months volunteered to participate.

INTERVENTIONS:

Not applicable.

MAIN OUTCOME MEASURES:

Peak force was measured in newtons using a hand-held dynamometer and passive ROM was measured in degrees with a goniometer. Separate multivariate analyses of variance were used to determine differences in strength and ROM between groups. Post hoc testing was used to elucidate differences between groups.

RESULTS:

The MKD group had the following: greater hip external rotation strength (P=.03), increased hip extension strength (P=.01), less plantarflexion strength (P=.007), and increased hip external rotation ROM (P=.008).

CONCLUSIONS:

The MKD group exhibited tight and weak ankle musculature. Interventions focusing on improving strength and ROM of the ankle may improve kinematics during a squat.

PMID:
18586134
DOI:
10.1016/j.apmr.2007.11.048
[Indexed for MEDLINE]

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