PMID: 3771579Jan 1, 1986Paper

Effect of muscular activity on valgus/varus laxity and stiffness of the knee

Journal of Biomechanics
T G OlmsteadG J Gouw

Abstract

Quantitative changes in valgus/varus knee stability with different levels of muscular activity were determined for five subjects. A specially designed machine was used to measure resistance to angulation in the frontal plane. This device held the thigh stationary, the knee straight, an cycled the leg from side to side at a constant rate between present moment limits. Resistance to this forced valgus/varus motion was measured simultaneously with torque about the knee in the sagittal plane. Muscle activity was monitored by electromyography (EMG). Direct comparison of moment-rotation characteristics allowed changes in stability to be quantified as a function of extension and flexion torque. Extension torques less than 20% of the maximum increased varus stability more than valgus stability. Flexion torques of the same relative magnitude increased valgus stability more than varus stability. Comparison with the literature suggested that prevention of opening of the lateral side of the joint under varus loading was responsible for increased varus stability with increasing torque, both with extension and flexion torques.

References

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Citations

Aug 17, 2001·Journal of Biomechanics·L Q Zhang, G Wang
Jun 24, 2015·Clinical Biomechanics·Megan J SchroederYasin Y Dhaher
Oct 20, 2004·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·J Troy BlackburnKevin M Guskiewicz
Dec 31, 2002·IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society·Li-Qun ZhangElliot J Roth
Jan 23, 2008·Scandinavian Journal of Medicine & Science in Sports·L HansenT Alkjaer
Sep 30, 2005·Journal of Orthopaedic Science : Official Journal of the Japanese Orthopaedic Association·Yoshinori IshiiHiroshi Kiga
Jan 1, 1994·The American Journal of Sports Medicine·E M Wojtys, L J Huston
May 24, 2013·Journal of Biomechanical Engineering·Joshua G A CashabackJim R Potvin
Dec 24, 2004·Journal of Neurophysiology·Y Y DhaherW Z Rymer
Sep 1, 2006·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Yasin Y Dhaher, Matthew J Francis
Jan 1, 1991·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·O D Schipplein, T P Andriacchi
Jan 1, 1988·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·J T Bryant, T D Cooke
Feb 1, 1995·The Journal of Bone and Joint Surgery. American Volume·R P Grelsamer
Jul 1, 1996·Medicine and Science in Sports and Exercise·T S BuchananD G Lloyd
Jan 10, 2002·Medicine and Science in Sports and Exercise·Li-Qun ZhangJesse P Butler
Jul 16, 2003·The American Journal of Sports Medicine·Joseph B MyersScott M Lephart
Apr 7, 2007·Journal of Applied Physiology·Marius HenriksenHenning Bliddal
Jan 1, 1994·Archives of Orthopaedic and Trauma Surgery·J BrunsS Luessenhop
Jan 29, 2021·Assistive Technology : the Official Journal of RESNA·Mobina KhosraviMaryam Jalali
Jun 11, 1992·Journal of Biomechanics·T P Quinn, C D Mote

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