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Related Experiment Videos

Patellar tracking during simulated quadriceps contraction.

Michael E Brunet1, Mark R Brinker, Stephen D Cook

  • 1Department of Orthopaedic Surgery, Tulane University School of Medicine, New Orleans, LA, USA. brinker@jwkoi.com

Clinical Orthopaedics and Related Research
|September 11, 2003
PubMed
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This study found that patella tracking differs between concentric and eccentric quadriceps contractions. Concentric contractions led to more lateral patella shift and tilt during specific knee flexion angles.

Area of Science:

  • Biomechanics
  • Orthopedics
  • Kinesiology

Background:

  • Patellar tracking is crucial for normal knee function.
  • Understanding patellar motion during different quadriceps contractions is important for diagnosing and treating patellofemoral pain and instability.

Purpose of the Study:

  • To compare patella tracking during simulated concentric and eccentric quadriceps contractions.
  • To investigate differences in patellar translation and tilt under varying muscular forces.

Main Methods:

  • Utilized a three-dimensional electromagnetic tracking system.
  • Analyzed patella movement in 12 cadaver knees during simulated concentric and eccentric quadriceps contractions across a range of tibiofemoral flexion (0-90 degrees).

Main Results:

Related Experiment Videos

  • The patella initially tracked medially, then shifted and tilted laterally throughout knee flexion.
  • Significantly greater lateral patella shift occurred between 40-70 degrees flexion during concentric vs. eccentric contractions.
  • Significantly greater lateral patella tilt occurred between 45-55 degrees flexion during concentric vs. eccentric contractions.

Conclusions:

  • Patellar instability likely results from multifactorial issues affecting the extensor mechanism's ability to seat the patella.
  • Patellar dislocations are uncommon in anatomically normal knees.