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Related Experiment Videos

Dynamic joint forces during knee isokinetic exercise.

K R Kaufman1, K N An, W J Litchy

  • 1Department of Orthopedics, Mayo Clinic, Rochester, MN 55905.

The American Journal of Sports Medicine
|May 1, 1991
PubMed
Summary
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Isokinetic exercise generates significant tibiofemoral and patellofemoral joint forces, potentially exceeding those in daily activities. Caution is advised for individuals with knee injuries due to these high biomechanical loads.

Area of Science:

  • Biomechanics
  • Sports Medicine
  • Orthopedics

Background:

  • Isokinetic exercise is widely used in rehabilitation and training.
  • Understanding joint forces during isokinetic exercise is crucial for injury prevention and management.

Purpose of the Study:

  • To analyze tibiofemoral and patellofemoral joint forces during isokinetic exercise.
  • To quantify compressive and shear forces at various knee flexion angles.

Main Methods:

  • An analytical biomechanical model was employed.
  • Forces were analyzed during isokinetic knee extension and flexion exercises.

Main Results:

  • High tibiofemoral compressive forces (up to 4.0 body weight) were observed at 55 degrees of knee flexion.

Related Experiment Videos

  • Anterior shear forces (max 0.3 body weight) occurred below 40 degrees of knee flexion during extension.
  • Posterior shear forces (max 1.7 body weight) were present above 40 degrees of knee flexion during extension and during flexion.
  • Patellofemoral joint loads reached up to 5.1 body weight, significantly higher than during straight leg raises.

    • Conclusions:

    • Isokinetic exercise can impose substantial loads on the knee.
    • These findings suggest cautious application of isokinetic exercise in patients with knee pathologies.