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Related Experiment Videos

Lower limb stability with ACL impairment.

S M Colby1, R A Hintermeister, M R Torry

  • 1Texas Scottish Rite Hospital, Movement Science Lab, Dallas 75219, USA. scolby@tsrh.org

The Journal of Orthopaedic and Sports Physical Therapy
|August 13, 1999
PubMed
Summary
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This study developed a reliable functional test to measure dynamic knee stability, identifying differences between injured and uninjured limbs in individuals with anterior cruciate ligament deficiency or reconstruction. The step-down test

Area of Science:

  • Biomechanics
  • Orthopedics
  • Sports Medicine

Background:

  • Current functional tests often fail to differentiate limb function after lower extremity injury.
  • Objective assessment of dynamic stability is crucial for rehabilitation and return-to-sport decisions.

Purpose of the Study:

  • To develop and validate a functional dynamic stability test for lower limbs.
  • To assess the test's reliability in differentiating between injured and uninjured limbs in anterior cruciate ligament deficient (ACLd) and reconstructed (ACLr) populations.

Main Methods:

  • Twenty-five healthy subjects, 11 ACLr, and 13 ACLd participants were evaluated.
  • Ground reaction forces were measured during single-leg hop and step-down tests using force plates.
  • Repeated measures ANOVA was employed to compare limb stability.

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Main Results:

  • The developed dynamic stability measures demonstrated high reliability.
  • Normal functional knee stability standards were established for hop and step-down tests.
  • The step-down test identified significant differences in vertical force stabilization time between injured and uninjured limbs in ACLr subjects.

Conclusions:

  • The established normal standards provide a reference for assessing functional deficits in ACLd and ACLr populations.
  • Vertical force during the step-down test is a promising outcome measure for monitoring rehabilitation progress.