Arthroscopic capsular shrinkage of the shoulder for the treatment of patients with multidirectional instability: Minimum 2-year follow-up.

Abstract

The study goal was to evaluate the arthroscopic treatment of patients with multidirectional instability of the shoulder (MDI). MDI is a disabling condition as a result of pain and restriction of activity. The treatment of MDI is primarily nonsurgical (supervised physiotherapy). Prospective cohort study. Arthroscopic capsular shrinkage, using a bipolar radiofrequency system, was performed in 32 patients (33 shoulders). The mean age was 27 years (range, 15 to 49). The Constant score was used for assessment preoperatively and at 6-month intervals. In 8 patients, labral lesions were revealed at arthroscopy and were addressed using arthroscopic methods. The follow-up was from 24 to 33 months (26 mean). Patients without labral pathology (group A) and patients with labral lesions (group B) are discussed separately. Group A showed an increase in the mean Constant score at 6 months, but the scores reached a plateau after 6 months. Statistical analysis using 1-way analysis of variance (ANOVA) showed that the mean difference between the preoperative Constant score and the score at latest follow-up was statistically significant (P <.0001; 95% confidence interval, 13.4 to 31.6; standard error, 2.2). The rate of failure or complication was 16%. Three patients experienced recurrence of instability and another developed adhesive capsulitis. Overall, patient satisfaction was 83%. Group B showed an improvement in the Constant scores, and all 8 patients were satisfied. No clinical recurrence of the instability was seen in this group. However, 1 patient developed adhesive capsulitis. This group is too small to draw any statistically valid conclusions. The early results are encouraging. Postoperative physiotherapy is of paramount importance. Continued long-term follow-up of this relatively new technique is required to determine the failure rate increase that is likely to occur at longer time intervals.