Four patients with habitual dislocation of the patella have been experienced and followed up more than 1 year since September, 1983 at Department of Orthopaedic Surgery, the Korea University Guro Hospital. They were 2 boys and 2 girls and age ranged from 6 to 20 years. They all were of bilateral involvement and treated with modified Campbell's procedure. Postoperative results were generally good on terms of pain relief, range of motion and patello-femoral tracking on motion, except one case which dislocated at 60 flexion.