buckeye
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Joined: May 24, 2007
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Here is an interesting abstract suggesting we may need to look harder at calf strength for patients tendency toward moving with medial knee displacement.
Arch Phys Med Rehabil Vol 89, July 2008
Muscle Strength and Flexibility Characteristics of People
Displaying Excessive Medial Knee Displacement
ABSTRACT. Bell DR, Padua DA, Clark MA. Muscle
strength and flexibility characteristics of people displaying
excessive medial knee displacement. Arch Phys Med Rehabil
2008;89:1323-8.
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.
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knee valgus movement and calf strength - 
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