Dynamic joint forces during knee isokinetic exercise

Kenton R Kaufman, K. N. An, William J Litchy, B. F. Morrey, E. Y S Chao

Research output: Contribution to journalArticle

127 Citations (Scopus)

Abstract

This study analyzed forces in the tibiofemoral and patellofemoral joints during isokinetic exercise using an analytical biomechanical model. The results show that isokinetic exercise can produce large loads on these joints, especially during extension exercises. The tibio-femoral compressive force (4.0 body weight) is approximately equal to that obtained during walking but it occurs at 55° of knee flexion. Anterior shear forces (resisting force to anterior drawer) exist during extension exercise at less than 40° of knee flexion, with a maximum of 0.3 body weight. Posterior shear forces (resisting force to posterior drawer) exist during extension exercise at knee joint angles greater than 40° and during the flexion portion of isokinetic exercise. The maximum posterior shear force is 1.7 body weight. The patellofemoral joint can encounter loads as high as 5.1 body weight which are 10 times higher than during straight leg raises. These results suggest that isokinetic exercise should be used cautiously in patients with knee lesions.

Original languageEnglish (US)
Pages (from-to)305-316
Number of pages12
JournalAmerican Journal of Sports Medicine
Volume19
Issue number3
StatePublished - 1991

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Knee
Exercise
Body Weight
Patellofemoral Joint
Knee Joint
Thigh
Walking
Leg
Joints

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Dynamic joint forces during knee isokinetic exercise. / Kaufman, Kenton R; An, K. N.; Litchy, William J; Morrey, B. F.; Chao, E. Y S.

In: American Journal of Sports Medicine, Vol. 19, No. 3, 1991, p. 305-316.

Research output: Contribution to journalArticle

Kaufman, Kenton R ; An, K. N. ; Litchy, William J ; Morrey, B. F. ; Chao, E. Y S. / Dynamic joint forces during knee isokinetic exercise. In: American Journal of Sports Medicine. 1991 ; Vol. 19, No. 3. pp. 305-316.
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