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The Journal of Bone and Joint Surgery, Vol 61, Issue 3 398-402, Copyright © 1979 by Journal of Bone and Joint Surgery, Inc
The role of the musculature in injuries to the medial collateral ligament
MH Pope, RJ Johnson, DW Brown and C Tighe
With a knee-testing device we measured the valgus stiffness of the medial
musculoligamentous complex of the knee in five volunteers. Tests were done
with the muscles quiescent and with contraction of the sartorius and vastus
medialis. Contraction of those muscles substantially increased the valgus
stiffness. In eight subjects the voluntary reaction times were measured.
With either a visual or a tactile impulse for prophylactic muscle
contraction, the muscles acted too slowly to augment the stiffness of the
knee so as to prevent injury. In fifty-one volunteers we applied the
maximum torque to the leg, just short of eliciting pain, and showed that
even then the muscle contraction would occur too late to protect the knee
in typical sports situations.

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