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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 neck...

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Atypical hip impingement.

Reto Sutter1, Christian W A Pfirrmann

  • 1Department of Radiology, Orthopedic University Hospital Balgrist, Forchstrasse 340, Zurich 8008, Switzerland. reto.sutter@balgrist.ch

AJR. American Journal of Roentgenology
|August 27, 2013
PubMed
Summary
This summary is machine-generated.

Radiographs, CT, and MRI can assess atypical hip impingement, including less common conditions like subspine, ischiofemoral, and iliopsoas impingement.

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Area of Science:

  • Orthopedic imaging
  • Radiology
  • Hip biomechanics

Background:

  • Femoroacetabular impingement (FAI) is a common cause of hip pain.
  • Atypical hip impingement presentations are less frequently diagnosed.
  • Understanding these variations is crucial for accurate diagnosis and treatment.

Purpose of the Study:

  • To outline the radiographic, CT, and MRI assessment of atypical hip impingement.
  • To differentiate uncommon impingement syndromes from classic FAI.
  • To identify associated conditions that may mimic or coexist with FAI.

Main Methods:

  • Review of imaging modalities including radiographs, computed tomography (CT), and magnetic resonance imaging (MRI).
  • Correlation of imaging findings with specific atypical hip impingement diagnoses.
  • Discussion of anatomical variations contributing to hip impingement.

Main Results:

  • Subspine impingement, ischiofemoral impingement, and iliopsoas impingement are distinct atypical forms.
  • These conditions are less prevalent than classic femoroacetabular impingement.
  • Abnormal femoral antetorsion, pelvic tilt, and hip motion can present independently or with FAI.

Conclusions:

  • Atypical hip impingement requires specific imaging evaluation beyond standard FAI assessment.
  • Radiographs, CT, and MRI are essential tools for diagnosing these less common hip conditions.
  • Recognition of associated anatomical factors is key for comprehensive management.