Spastic subluxation of 64 hips in 45 patients with cerebral palsy (CP) was reviewed in a 19-year follow-up. Varus osteotomy prevented dislocation in all patients. All nine hips that later dislocated were in quadriplegic patients who had not received treatment or who had had muscle releases. Dislocated hips had the most degenerative arthritis, pain, and the least movement. Subluxated hips also had more degenerative arthritis but approximately the same level of pain as reduced hips.