Posterior allograft bone-block for recurrent dislocation of the hip after hemiarthroplasty in noncompliant patients with neuromuscular disease.

Two mentally retarded patients with cerebral palsy developed recurrent dislocation of the hip after hemiarthroplasty. Instability had persisted despite release of contracted soft tissues, conversion to a bipolar arthroplasty, and cast immobilization in one patient and repeated closed reductions with abduction splinting and bed rest in the other. Both patients were treated with a posterior femoral head allograft bone-block that resulted in restoration of hip function and control of recurrent dislocations.