Evaluation of functional outcomes and preliminary results in a case series of 15 children treated with arthroscopic release for internal rotation contracture of the shoulder joint after Erb’s palsy

INTRODUCTION The purpose of this study was to evaluate shoulder function following minimally invasive subtotal subscapularis muscle and periarticular capsuloligamentous arthroscopic release in children with Erb's palsy. METHODS A prospective study was conducted on 15 consecutive children who underwent subtotal subscapularis muscle and periarticular capsuloligamentous arthroscopic release to treat internal rotation contracture of the shoulder joint after Erb's palsy. Age at surgery ranged from 24 to 38 months (average 28.3) (2.4 years). All of the patients were assessed clinically and radiologically preoperatively and postoperatively at regular intervals. The Mallet scoring system was used to analyze the results. RESULTS The mean external rotation improved from -24° to +46° (p = 0.001) at the last follow-up. Active internal rotation was preserved in all cases. At the final follow-up, there had been no loss of the external rotation gained and no recurrence of internal rotation contracture of the shoulder, and the mean Mallet score (total) had improved from 11 to 17 points (p = 0.001). CONCLUSIONS In children aged from 1 to 3 years, an arthroscopic release procedure alone may successfully restore function and yield a centered glenohumeral joint, which has a beneficial effect on glenoid remodeling. LEVEL OF EVIDENCE Level IV.