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Related Experiment Videos

Patellar tendon length--the factor in patellar instability?

Ph Neyret1, A H N Robinson, B Le Coultre

  • 1Department of Orthopedics, Hopital de la Croix-Rousse, Centre Livet, 8 rue de Margnolles, 69300, Caluire, France. philippe.neyret@chu-lyon.fr

The Knee
|February 7, 2002
PubMed
Summary
This summary is machine-generated.

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Patients with a history of patellar dislocation have significantly longer patellar tendons compared to controls. Magnetic resonance imaging (MRI) offers a precise method for measuring patellar tendon length, aiding in patellar instability assessment.

Area of Science:

  • Orthopedics
  • Radiology
  • Biomechanics

Background:

  • Patellar instability is a common orthopedic condition.
  • Accurate assessment of patellar tendon length is crucial for understanding patellofemoral mechanics.
  • Previous methods for evaluating patellar tendon length have limitations.

Purpose of the Study:

  • To compare patellar tendon length in knees with and without a history of patellar dislocation.
  • To evaluate the accuracy of magnetic resonance imaging (MRI) versus X-ray in measuring patellar tendon length.
  • To determine the primary cause of patella alta in patients with patellar instability.

Main Methods:

  • A comparative study involving 42 knees with a history of patellar dislocation and 51 control knees.
  • Lateral X-rays and MRI scans were performed on all participants.

Related Experiment Videos

  • Measurements included patellar tendon length and the distance from the tibial plateau to the tendon insertion point.

    • Main Results:

    • Patellar tendons were significantly longer in the dislocation group (53 mm MRI, 53 mm X-ray) compared to controls (44 mm MRI, 46 mm X-ray).
    • No significant difference was found between MRI and X-ray measurements of tendon length (P=0.52).
    • The distance between the tibial plateau and tendon insertion did not differ significantly between groups (P=0.19).

    Conclusions:

    • Patella alta in patellar dislocation is primarily attributed to a longer patellar tendon, not a low tibial insertion.
    • MRI measurement of patellar tendon length is a specific and sensitive tool for assessing patellar instability.
    • Findings suggest MRI is superior to the Caton-Deschamps index for evaluating patellar instability.