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Related Experiment Videos

Version of the osteoarthritic knee

D G Eckhoff1, R J Johnston, E R Stamm

  • 1Department of Orthopaedics, University of Colorado, Denver.

The Journal of Arthroplasty
|February 1, 1994
PubMed
Summary

Knee version, or tibial rotation, averages 0 degrees in normal knees but 5 degrees in osteoarthritic knees. This difference in knee version impacts total knee arthroplasty component alignment.

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Radiology

Background:

  • Knee version, defined as tibial rotation relative to the femur in full extension, is a critical parameter in knee biomechanics.
  • Understanding knee version is essential for accurate surgical planning in total knee arthroplasty (TKA).

Purpose of the Study:

  • To quantify and compare knee version in normal versus osteoarthritic knees using computed tomography (CT).
  • To assess the clinical implications of altered knee version in osteoarthritic knees for TKA component placement.

Main Methods:

  • Computed tomography (CT) scans were utilized to evaluate knee version in a cohort of normal and osteoarthritic knees.
  • Knee version was measured as the difference between the transverse axes of the femoral condyles and the tibia in full knee extension.

Main Results:

  • Normal knees exhibited an average knee version of 0 degrees (neutral rotation).
  • Osteoarthritic knees demonstrated an average knee version of 5 degrees (external tibial rotation).

Conclusions:

  • A significant difference in knee version exists between normal and osteoarthritic knees.
  • The increased external tibial rotation in osteoarthritic knees necessitates consideration during TKA component alignment to prevent malrotation and optimize outcomes.

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