Investigation
- only investigation worth doing for external type snapping is dynamic ultrasound, where the ITB can be visualized snapping over the greater trochanter
- for internal type snapping, dynamic and static ultrasound demonstrate the abnormal movement of the iliopsoas tendon, a thick iliopsoas muscle, an enlarged bursa as well as peritendinous fluid collections
- bursography and tendonography have also been described for detecting internal snapping
- CT
- only role for CT is to compare the iliopectineal eminences on each side
- only role for CT is to compare the iliopectineal eminences on each side
- plain radiographs and MRI
- useful in the diagnosis of intra-articular type snapping by demonstrating any loose bodies, synovial chondromatosis, acetabular labral tears or osteochondral fractures
Reference:
- Allen WC, Cope R. Coxa saltans: the snapping hip revisited. J Am Acad Orthop Surg 1995; 3: 303-8.
- Provencher MT, Hofmeister EP, Muldoon MP. The surgical treatment of external coxa saltans (the snapping hip) by Z-plasty of the iliotibial band. Am J Sports Med 2004; 32: 470-6.
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