Traumatic hip dislocation with incomplete reduction due to soft-tissue interposition in a 4-year-old boy.

The case of a traumatic dislocation of the left hip in a 4-year-old boy is presented. After an initial attempt at reduction under general anesthesia, a permanent deformity in the flexion of the hip remained, and there was radiographic evidence of a nonconcentric reduction. Computed tomography (CT) showed interposition in the posterior part of the joint. Under general anesthesia, the mobilization of the hip reduced the dislocation correctly, removing the necessity of open treatment. This case stresses the need for early diagnosis of this serious complication and closed reduction of the joint, avoiding the poor results of open and deferred treatments.