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Related Experiment Videos

Knee laxity in symptomatic osteoarthritis

M E Brage1, L F Draganich, L A Pottenger

  • 1University of Chicago Medical Center, Department of Surgery, IL 60637.

Clinical Orthopaedics and Related Research
|July 1, 1994
PubMed
Summary

Osteoarthritis (OA) of the knee surprisingly reduces joint laxity, contrary to expectations. Severe knee OA leads to significantly less movement and rotation compared to healthy or early-stage knees.

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Rheumatology

Background:

  • Osteoarthritis (OA) is a degenerative joint disease affecting millions globally.
  • The impact of knee OA on joint laxity remains incompletely understood.
  • Previous research has not fully elucidated the relationship between OA severity and knee joint stability.

Purpose of the Study:

  • To investigate the effect of primary knee osteoarthritis (OA) on knee joint laxity.
  • To compare laxity in knees with varying degrees of OA (mild, moderate, severe) against healthy controls.
  • To determine if OA progression leads to increased or decreased joint laxity.

Main Methods:

  • A study involving 22 patients with primary knee OA and 9 healthy controls.
  • Laxity measurements using the Genucom Knee Analysis System.

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  • Categorization of OA severity based on joint space preservation (mild, moderate, severe).

    • Main Results:

    • Severe knee OA knees exhibited significantly less total anteroposterior (AP) translation compared to control knees (6.6 mm vs. 12.2 mm).
    • Severe OA knees showed reduced total tibial rotation (59 degrees vs. 79 degrees) and varus/valgus rotation (10.4 degrees vs. 15 degrees) versus early OA.
    • A marked decrease in AP translation (57%), varus/valgus rotation (31%), and tibial rotation (26%) was observed in severe OA compared to early OA.

    Conclusions:

    • Osteoarthritic knees tend to exhibit reduced laxity compared to normal knees.
    • This decreased laxity is likely due to ligament contracture and osteophyte impingement.
    • The findings suggest a stiffening effect of advanced knee OA on joint biomechanics.