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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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External snapping hip: classification based on magnetic resonance imaging features and clinical correlation.

Chul-Ho Kim1, Seul Ki Lee2, Jun Ho Kim3

  • 1Department of Orthopaedic Surgery, Gachon University Gil Medical Center, Incheon, Republic of Korea.

Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
|July 24, 2020
PubMed
Summary

External snapping hip (ESH) has two MRI presentations: a tense iliotibial band (ITB) or hypertrophied gluteus maximus (GM). The tense ITB group experienced shorter symptom duration and showed a more reversible condition.

Keywords:
Clinical correlationMRIexternalhip arthroscopysnapping hiptype

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Area of Science:

  • Orthopedics
  • Radiology
  • Sports Medicine

Background:

  • External snapping hip (ESH) is increasingly diagnosed in active populations.
  • Magnetic resonance imaging (MRI) is crucial for visualizing soft tissue abnormalities in ESH.
  • Limited research exists on MRI's clinical value in ESH management.

Purpose of the Study:

  • To investigate the clinical and radiological characteristics of external snapping hip (ESH) based on MRI findings.
  • To compare clinical outcomes between different ESH subtypes identified via MRI.

Main Methods:

  • 104 patients with ESH were analyzed; 55 met inclusion criteria.
  • Patients were classified into two groups based on MRI: tense iliotibial band (ITB) or hypertrophied gluteus maximus (GM).
  • Clinical and radiological variables were compared between the groups.

Main Results:

  • The tense ITB group demonstrated a significantly shorter symptom duration compared to the hypertrophied GM group (p < 0.001).
  • No significant differences were observed in other assessed variables between the two groups.

Conclusions:

  • External snapping hip (ESH) exhibits two distinct MRI features: tense ITB and hypertrophied GM.
  • The tense ITB subtype is associated with shorter symptom duration and a potentially more reversible condition than the hypertrophied GM subtype.