Modified Hauser operation for patellar instability. Immediate mobilization of 35 knees, a 5-8 year follow-up study.

We performed a follow-up examination of 35 knees with chronic patellar instability treated by a modified Hauser operation: medialization and distalization of the tibial tubercle without dorsal transfer, and fixation of the tubercle rigidly with 2 cortical screws. Cast immobilization was not used and the patients were allowed to mobilize the knee immediately. The follow-up period was 6 (5-8) years. 27 of 35 knees were excellent or good at follow-up, while 8 patients were more or less dissatisfied with the result. 5 knees had arthrosis at follow-up. No severe complications occurred, nor did the rate of minor complications differ from earlier reports.