Abstract
The application of arthroscopic procedure for osteoarthritic knee is limited to rather initial stages of the disease. Here we report the results of new arthroscopic procedure, which was named arthroscopic posteromedial release, applied to relatively severe cases of medial type osteoarthrits (OA)
Forty-eight knees of 46 patients of OA knees with flexion contracture were treated with arthroscopic posteromedial release. Thirty-two were female and 14 were male. All the patients had been treated conservatively beforehand. The mean age of the patients was 71.6 (range, 47 to 84 years), the average range of motion was 13 to 129 degrees. Only one case was classified stage II in Kellgren Lowrence x-ray classification, 13 and 34 cases were stage III and IV respectively. The average femoro-tibial angle was 183.4+-4.4 degrees.
In surgery, we release the joint capsule along with the medial tibial condyle, arthroscopic debridement including medial meniscentomy was performed at the same time. If some cases, medial collateral ligament was cut transversely to obtain enough joint space. We use hyaluronan intra-articularly once a week for 5 weeks postoperatively. Patients were examined at 3,6,12,18 and 24 months after surgery and evaluated subjectively and objectively with the rating system of Japanese Orthopaedic Association knee score (JOA score). Clinical results were also classified excelletn, good, fair and poor by our criteria.
Eighty-three per cent (40 knees) of patients were satisfied at their last follow up. Sixty-seven percent (32 knees) of the patients were excellent or good. Six knees were converted to TKA because of their persistent knee pain. Twenty-eight knees complained of night pain pre-operatively, but only four of them complained of it postoperatively
Considering that most of the patients in this series were grade IV in x-rays and their joint surface of medial compartment showed large eburnation both femur and tibia, TKA is most preferable treatment conventionally. But our results showed this arthroscopic technique was one of the applicable choices for severe OA knees.
The abstracts were prepared by Mr Simon Donell. Correspondence should be addressed to him at the Department of Orthopaedics, Norfolk & Norwich Hospital, Level 4, Centre Block, Colney Lane, Norwich NR4 7UY, United Kingdom.
