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Combined CT-arthrography in recurrent traumatic hip dislocation.

Traumatic posterior hip dislocations are relatively unusual in children, and recurrences are extremely rare. Hip dislocations often result in radiographically obscure osteochondral femoral head and acetabular damage that may escape detection by tomography [1 ]. Computed tomography (CT) of the hip provides easy visualization of small osseous fragments, but does not delineate cartilaginous fragments or capsular defects [2]. Hip arthrography is a helpful adjunct in detecting intraarticular cartilaginous fragments and establishing capsular integrity. We report the combined clinical and radiographic findings with emphasis on detection of a capsular defect.