The effects of thermal capsular shrinkage on the outcomes of arthroscopic stabilization for primary anterior shoulder instability

BACKGROUND: The effectiveness of arthroscopic thermal capsulorrhaphy in the prevention of recurrent instability in primary anterior stabilization is undetermined. PURPOSE: To determine if patients with recurrent anterior shoulder instability who have labral repair plus arthroscopic thermal capsulorrhaphy have better outcomes than those with labral repair alone. STUDY DESIGN: Cohort study; Level of evidence, 3. METHOD: There were 72 patients who underwent arthroscopic anterior shoulder stabilization with Suretac II tacks (n = 32) during 1996 to 1999 or with Suretac II tacks plus arthroscopic radiofrequency capsular shrinkage (n = 40) from 1999 to 2002. Standardized patient-determined and examiner-determined outcome measures were obtained preoperatively and at 3, 6, 12, and 24 months postoperatively. Statistical analyses included a Kaplan-Meier analysis of time to recurrent instability. RESULTS: Of the 72 patients, 66 had complete follow-up, including 28 patients treated with the Suretac stabilization and 38 patients with the Suretac plus radiofrequency shrinkage, for a mean follow-up of 58 and 30 months, respectively. All patients had a Bankart lesion. Both groups had similar results with respect to patient-determined and examiner-determined outcome measures. The only adverse outcome was postoperative recurrent instability in 6 of 28 cases in the Suretac group alone and 8 of 38 cases in the Suretac-plus -shrinkage group. Most recurrent instability occurred between 6 and 24 months. Kaplan-Meier analysis for time to recurrent instability showed no differences in the rate of instability recurrence between the 2 groups. CONCLUSION: Arthroscopic thermal capsulorrhaphy neither enhanced nor impaired the outcomes of arthroscopic labral repair with biodegradable tacks in patients with primary recurrent anterior shoulder instability.