Long-term results of arthroscopic medial reefing for patellar instability

BackgroundThe purpose of the study was to investigate the long-term outcomes of the all-inside arthroscopic medial reefing (AAMR) procedure for patellar instability and the factors that affect successful outcome.MethodsIn this retrospective study, AAMR with suture was performed in 16 knees of 15 patients who had at least one patellar dislocation and did not experience a decrease in pain and who did not have a major radiological bony abnormality. Preoperatively, Tegner and Lysholm scales were used; for the final evaluation Tegner, Lysholm, Kujala and Knee injury and Osteoarthritis Outcome Score (KOOS) were used.ResultsThe average age of the patients at the time of operation was 18 years (range: 11–36 years). The average follow-up time was 118.3 months (range: 85–143 months). Six of the 16 knees (37.5%) exhibited re-dislocation. Preoperatively, the mean Lysholm and Tegner were 66.5 and 4.0, respectively; and postoperatively increased to 89.3 (P = .001) and 4.66, respectively. At the final follow-up, mean Kujala was 89.3 (good), and mean KOOS was 91.4. In all patients with re-dislocation, fewer than four knots were used, and none of the patients with four knots exhibited re-dislocation. Re-dislocations occurred in two, two, one and one patients at two, three, five and eight years, respectively.ConclusionsThe AAMR technique is associated with minimal incisional scarring and an increase in functional scores. It is also associated with a high risk of re-dislocation compared with other methods. If the technique still needs to be used, despite the high re-dislocation rate, at least four knots should be applied.