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Related Concept Videos

Bones of the Lower Limb: Femur and Patella01:16

Bones of the Lower Limb: Femur and Patella

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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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Related Experiment Video

Updated: Jun 4, 2025

Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy
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Assessing Femoral Anteversion in Patients With Bilateral Recurrent Patellar Dislocations.

Essi E Honkonen1,2, Petri J Sillanpää2,3, Aleksi Reito1,2

  • 1Department of Orthopaedics, Unit of Musculoskeletal Surgery, Tampere University Hospital, Finland.

Orthopaedic Journal of Sports Medicine
|December 19, 2024
PubMed
Summary
This summary is machine-generated.

Patients with recurrent patellar dislocations (RPDs) exhibit increased femoral anteversion (FA). Bilateral RPDs are associated with significantly higher FA compared to individuals without RPD history, though no difference exists between unilateral and bilateral RPD groups.

Keywords:
bilateral patellar dislocationbiomechanicsfemoral anteversionkneeknee, patellalateral patellar dislocationrecurrent patellar dislocation

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Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Radiology

Background:

  • Recurrent patellar dislocations (RPDs) affect a significant portion of patients after initial lateral patellar dislocation.
  • Increased femoral anteversion (FA) is a suspected contributor to patellar instability due to enhanced lateralizing forces.
  • The relationship between bilateral RPDs and the degree of FA remains unclear.

Purpose of the Study:

  • To investigate and compare femoral anteversion (FA) in patients with unilateral and bilateral recurrent patellar dislocations (RPDs).
  • To determine if bilateral RPDs are associated with greater FA compared to unilateral RPDs and controls.

Main Methods:

  • A case-control study involving 52 skeletally mature patients with RPDs and 54 controls.
  • Rotational computed tomography or magnetic resonance imaging was used to assess FA in patients.
  • FA values of both lower extremities were evaluated, and RPD laterality (uni- or bilateral) was determined.

Main Results:

  • Patients with bilateral RPD showed significantly greater FA (mean difference of 10.8°, P = .001) compared to controls.
  • Patients with unilateral RPD also demonstrated increased FA in both limbs compared to controls.
  • No statistically significant difference in FA was found between patients with unilateral and bilateral RPD.

Conclusions:

  • Bilateral RPDs are associated with increased femoral anteversion (FA) compared to individuals without a history of patellar dislocation.
  • Unilateral RPDs also show increased FA bilaterally when compared to controls.
  • The degree of FA does not significantly differ between patients with unilateral and bilateral RPDs.