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Related Experiment Videos

Reliability of the Genucom Knee Analysis System. A pilot study.

K J McQuade1, J A Sidles, R V Larson

  • 1Department of Orthopaedics, University of Washington, Seattle 98195.

Clinical Orthopaedics and Related Research
|August 1, 1989
PubMed
Summary

Instrumented knee laxity testing using the Genucom system shows variability. Significant changes in anterior drawer, valgus-varus, and tibial rotation measures are needed to confirm true knee joint changes.

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Sports Medicine

Background:

  • Instrumented knee laxity testing is increasingly used in orthopedic and rehabilitation settings.
  • The Genucom Knee Analysis System is a device designed for quantitative knee joint laxity assessment.

Purpose of the Study:

  • To evaluate the intrarater reliability of the Genucom Knee Analysis System.
  • To determine the smallest detectable difference for key knee laxity measurements.

Main Methods:

  • Five healthy subjects underwent repeated testing on three separate occasions by a single examiner.
  • Measurements included anteroposterior (AP) drawer, valgus/varus stress, and tibial rotation at various knee flexion angles.
  • Intrarater variability was calculated to estimate statistically significant differences for repeat examinations.

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Main Results:

  • Variability in anterior drawer and tibial rotation measurements was influenced by knee flexion angle.
  • Anterior drawer measurements demonstrated potentially greater reproducibility compared to total AP motion.
  • Thresholds for detecting true change were established: >3 mm for anterior drawer, >5 mm for valgus-varus, and 7-17 degrees for tibial rotation (95% confidence).

Conclusions:

  • The Genucom system's reliability varies with specific knee laxity tests and flexion angles.
  • Understanding measurement variability is crucial for interpreting changes in knee laxity over time.
  • These findings provide clinically relevant thresholds for assessing true changes in knee joint stability.