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Imaging findings in external snapping hip syndrome

Ganesh Krishnamurthy1, Bairbre L Connolly, Unni Narayanan

  • 1Image Guided Therapy, Diagnostic Imaging, The Hospital for Sick Children, Toronto, Canada.

Pediatric Radiology
|September 28, 2007
PubMed

Insights

Dynamic sonography diagnosed external snapping hip in a child. Retrospective review revealed thickened iliotibial band or gluteus maximus muscle, with gluteus maximus atrophy, as key imaging findings.

Area of Science:

  • Orthopedics
  • Radiology
  • Pediatric Imaging

Background:

  • Snapping hip is a clinical condition characterized by an audible or palpable snapping sensation during hip movement.
  • External snapping hip is often caused by the iliotibiotibial band or gluteus maximus tendon snapping over the greater trochanter.
  • Diagnosis can be challenging, particularly in pediatric patients.

Observation:

  • A case of external snapping hip was diagnosed using dynamic sonography.
  • A retrospective review of imaging in pediatric patients with snapping hip was conducted.
  • Magnetic resonance imaging (MRI) and computed tomography (CT) scans were analyzed.

Findings:

  • Thickening of the iliotibial band was identified as a cause of snapping hip.
  • Thickening of the anterior edge of the gluteus maximus muscle was also identified as a cause.
  • Atrophy of the bulk of the gluteus maximus muscle was noted as a significant secondary sign associated with snapping hip.

Implications:

  • Dynamic sonography is a valuable tool for diagnosing external snapping hip.
  • Specific MRI and CT findings can help identify the underlying cause of snapping hip in children.
  • Recognizing gluteus maximus atrophy may aid in understanding the pathophysiology and management of snapping hip.

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