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Related Concept Videos

Bones of the Lower Limb: Femur and Patella01:16

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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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The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
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Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

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Same author

Rotation matters: CT and MRI yield different tibiofemoral rotation angles in patellofemoral patients. An investigational plateau-anchored MRI method is descriptively associated with a smaller mean CT-MRI difference.

Journal of experimental orthopaedics·2026
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Acceptable outcomes for isolated medial patellofemoral ligament reconstruction despite using higher thresholds for patella alta and regardless the value of tibial tubercle-trochlear groove distance and the degree of trochlear dysplasia-An international multicenter study.

Journal of ISAKOS : joint disorders & orthopaedic sports medicine·2025
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A shortened Knee Injury and Osteoarthritis Outcome Score (KOOS) is sufficient for measuring change in a cohort of patellofemoral instability patients.

Journal of ISAKOS : joint disorders & orthopaedic sports medicine·2025
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Articular cartilage damage is frequently noted at the time of medial patellofemoral ligament reconstruction and is associated with age and patellofemoral anatomy.

Journal of ISAKOS : joint disorders & orthopaedic sports medicine·2025
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Anatomic Risk Factors for Lateral Patellar Instability.

Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association·2024
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Patellofemoral instability part 2 (Bony procedure for patellar surgical stabilization): State of the art.

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Updated: May 6, 2026

Author Spotlight: Double Posteromedial Approach for Treating Posterior Cruciate Ligament Cysts
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Displacing lateral meniscus masquerading as patella dislocation.

Elizabeth A Arendt1, Cristián A Fontboté, Sara R Rohr

  • 1Department of Orthopaedic Surgery, University of Minnesota, 2450 Riverside Avenue South, Suite R200, Minneapolis, MN, 55454, USA, arend001@umn.edu.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|November 1, 2013
PubMed
Summary

A lateral meniscus tear can mimic patella dislocation. Clinicians should suspect this uncommon knee condition in patients with locking symptoms, even if they report patella instability.

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Area of Science:

  • Orthopaedic Surgery
  • Sports Medicine
  • Knee Anatomy

Background:

  • Recurrent lateral patella dislocation is a common diagnosis.
  • Uncommon meniscal conditions can present with similar symptoms.
  • Misdiagnosis can lead to persistent knee problems.

Purpose of the Study:

  • To highlight an easily missed meniscal condition.
  • To differentiate lateral meniscus tears from patella instability.
  • To improve diagnostic accuracy for specific knee symptoms.

Main Methods:

  • Retrospective chart review of 12 knees in 11 patients.
  • Patients initially diagnosed with recurrent lateral patella dislocation.
  • Surgical findings and patient outcomes were analyzed.

Main Results:

  • 12 knees showed displaceable lateral menisci (6 with tears, 6 with attenuation).
  • All patellae were stable under anesthesia.
  • Surgical repair or partial meniscectomy resolved symptoms in all patients.

Conclusions:

  • High suspicion for lateral meniscus tear/instability is crucial.
  • Symptoms of knee locking in flexion are key indicators.
  • Physical examination of the patella is vital in diagnosis.