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Related Concept Videos

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
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Computational analysis of factors contributing to patellar dislocation.

Clare K Fitzpatrick1, Robert N Steensen2, Aruna Tumuluri1

  • 1Center for Orthopaedic Biomechanics, University of Denver, Denver, Colorado.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|September 3, 2015
PubMed
Summary

Recurrent patellar dislocations are common. This study identified specific anatomical factor combinations, like sulcus angle and Insall-Salvati ratio, that significantly increase the risk of lateral patellar dislocation.

Keywords:
finite elementpatellar dislocationpatellar instabilitypatellofemoral joint mechanics

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Medical Imaging

Background:

  • Patellar dislocation often recurs despite conservative treatment.
  • Anatomical abnormalities are implicated in recurrent patellar dislocations.
  • Current treatments may not address underlying anatomical issues.

Purpose of the Study:

  • To evaluate interactions between key anatomical factors predisposing to patellar dislocation.
  • To identify combinations of abnormal factors increasing the risk of recurrent lateral patellar dislocation.

Main Methods:

  • Developed a finite element model of the patellofemoral joint.
  • Simulated 100 combinations of four key anatomical factors: sulcus angle, Insall-Salvati ratio, tibial tubercle-trochlear groove distance, and femoral anteversion.
  • Recorded resulting patellofemoral joint kinematics and forces.

Main Results:

  • The sulcus angle was identified as the most impactful factor on patellar constraint.
  • Combinations of multiple abnormal anatomical factors were generally required to produce extreme patellar alignments.
  • Specific interactions between factors significantly influence the risk of recurrent lateral patellar dislocation.

Conclusions:

  • Understanding the interplay of anatomical factors is crucial for diagnosing recurrent patellar dislocations.
  • Patient-specific anatomical assessments can guide optimal treatment strategies.
  • This research aids in developing targeted interventions for recurrent lateral patellar dislocations.