Dynamic Sonography of External Snapping Hip Syndrome
- Author(s)
- Yun Sun Choi; Sung Moon Lee; Baek Yong Song; Sang Hyun Paik; Yong Kyu Yoon
- Keimyung Author(s)
- Lee, Sung Mun
- Department
- Dept. of Radiology (영상의학)
- Journal Title
- Journal of Ultrasound in Medicine
- Issued Date
- 2002
- Volume
- 21
- Issue
- 7
- Keyword
- dynamic sonography; external; gluteus maximus muscle; iliotibial band; snapping hip
- Abstract
- Objective. To evaluate the dynamic sonographic findings of external snapping hip syndrome.
Methods. Five patients with 7 cases of painful external snapping hip (3 male and 2 female; age range,
14–32 years; mean, 19 years) were examined with sonography. Two patients had bilateral snapping.
Dynamic sonographic examinations of hips were performed with a linear 5- to 12-MHz transducer
during hip motion. Results. Dynamic sonographic studies of the affected hip revealed causes of the
external snapping hip in all cases. It was elicited by an abnormal jerky movement of the iliotibial band
overlying the greater trochanter in 5 of 7 cases and of the gluteus maximus muscle in 2 cases. The iliotibial
band over the greater trochanter was hypoechoic in 3 of the 5 cases and thickened in 1 case.
Dynamic sonography showed good correlations between the jerky movements of the iliotibial band
and the gluteus maximus muscle and the painful snapping reported by the patients. Conclusions.
Dynamic sonography was helpful in the diagnosis of external snapping hip syndrome; it showed realtime
images of sudden abnormal displacement of the iliotibial band or the gluteus maximus muscle
overlying the greater trochanter as a painful snap during hip motion.
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