To elucidate the time of appearance of the dislocated and subluxated hip in cerebral palsy, 37 hip joints in 26 patients were reviewed.
In spastic type, dislocation and subluxation were inclined to occur earlier, from 4 to 6 years old, than in athetotic type. And also in the patients who could not migrate, they occurred earlier than in the patients who could do.
It was suggested that the diminution of the hip movement caused by contracture was a significant factor along with the muscle imbalance.
