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Related Experiment Videos

Patellar tracking measurement in the normal knee

R Nagamine1, T Otani, S E White

  • 1Biomechanical Research Laboratory, Missouri Bone and Joint Center, St. Louis.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|January 1, 1995
PubMed
Summary

This study investigated patellar movements during knee flexion in cadavers. Changing the measurement axis or femoral rotation significantly altered patellar tracking, while quadriceps force variations had minimal impact.

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Knee Kinematics

Background:

  • Understanding normal patellar movement is crucial for diagnosing and treating knee conditions.
  • Existing measurement techniques may influence observed patellar kinematics.

Purpose of the Study:

  • To evaluate normal patellar movements in cadaveric knees.
  • To assess the impact of different measurement conditions on patellar kinematics.

Main Methods:

  • Eleven fresh frozen cadaveric knee specimens were used.
  • A knee kinematics test device measured patellar movements.
  • Four conditions were tested: measuring axis, femoral rotation, quadriceps force direction, and magnitude.

Main Results:

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  • The patella exhibited lateral shifting, lateral tilting, and medial rotation during knee flexion.
  • Measuring axis and femoral rotation significantly altered patellar position.
  • Quadriceps force magnitude and direction variations had no significant effect on patellar movements.

    • Conclusions:

    • Measurement axis and femoral rotation are critical factors influencing observed patellar kinematics.
    • Quadriceps force parameters tested did not significantly affect patellar tracking in this model.
    • These findings highlight the importance of standardized measurement techniques in patellar kinematics research.