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Related Experiment Videos

Comprehensive gait analysis in posterior-stabilized knee arthroplasty

S A Wilson1, P D McCann, R S Gotlin

  • 1Insall Scott Kelly Institute for Orthopaedics and Sports Medicine, New York, NY 10128, USA.

The Journal of Arthroplasty
|June 1, 1996
PubMed
Summary
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Posterior-stabilized knee replacements show normal gait and strength at nearly 4 years. However, some patients exhibit prolonged vastus medialis firing and reduced knee motion during walking and stair descent.

Area of Science:

  • Orthopedic Surgery
  • Biomechanics
  • Gait Analysis

Background:

  • Total knee arthroplasty (TKA) aims to restore function.
  • Posterior-stabilized (PS) prostheses are common, but long-term gait outcomes require further investigation.

Purpose of the Study:

  • To evaluate gait parameters and muscle strength in patients with posterior-stabilized TKA compared to healthy controls.
  • To identify potential gait abnormalities not explained by muscle weakness or limited range of motion.

Main Methods:

  • Isokinetic muscle testing and comprehensive gait analysis were performed on 16 patients with PS-TKA (Insall-Burstein PS II) and 32 age-matched controls.
  • Evaluations were conducted at a mean of 46 months post-surgery.

Main Results:

Related Experiment Videos

  • No significant differences in spatiotemporal gait parameters or isokinetic strength were found between PS-TKA patients and controls.
  • Reduced knee range of motion was observed during level walking and stair descent in the PS-TKA group.
  • Prolonged vastus medialis firing was noted in some patients, indicating altered muscle activation patterns.

Conclusions:

  • While PS-TKA provides comparable spatiotemporal gait parameters to controls at nearly 4 years, subtle gait abnormalities persist.
  • These abnormalities are not fully explained by muscle weakness, altered muscle activity, or limited range of motion.
  • Gait outcomes with PS prostheses are comparable to cruciate-retaining and superior to cruciate-sacrificing designs.