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A motor vehicle accident victim presented with a fractured acetabulum and had apparent entrapped bony intraarticular fragments seen on computed tomography scanning. At surgery, these fragments were found to be a partially avulsed calcified ligamentum teres that was apparently caused by a previous injury of the same hip. Excision of the calcified ligament and surgical stabilization of the acetabulum were performed. A calcified ligamentum teres may be confused with entrapped bony fragments and therefore cause difficulty in the evaluation and management of acetabular fractures.
Ebraheim et al. (1991) studied this question.