Arthroscopic capsular release for refractory shoulder stiffness: a critical analysis of effectiveness in specific etiologies.

HYPOTHESIS The purpose of this study is to report and compare the outcome of arthroscopic capsular release in patients with shoulder stiffness with post-traumatic, postsurgical, and idiopathic etiologies. We hypothesize that patients with idiopathic or post-traumatic stiffness have better outcomes after arthroscopic capsular release than those with shoulder stiffness with a postsurgical etiology. MATERIALS AND METHODS A retrospective review of 115 patients who underwent arthroscopic capsular release for refractory shoulder stiffness was performed. There were 60 men and 55 women with a mean age of 49 years (range, 27 to 81 years). The patients were divided into 3 groups according to the etiology of stiffness: post-traumatic (26 patients), postsurgical (48 patients), and idiopathic (41 patients). Arthroscopic capsular release was performed in all patients after a mean of 9 months of physical therapy (range, 6 to 13 months). RESULTS At a mean follow-up of 46 months (range, 25 to 89 months), the overall subjective shoulder value in all groups improved from 29% to 73% and the age- and gender-adjusted Constant score improved from 35% to 86%. The mean pain score decreased from 7.5 to 1, and mean active forward flexion, external rotation, and internal rotation increased from 97 degrees , 14 degrees , and the L5 vertebral level, respectively, to 135 degrees , 38 degrees , and the T11 vertebral level, respectively (P < .0001). There was no significant difference between the outcomes of idiopathic and post-traumatic stiffness (P = .7). However, the Constant score and subjective shoulder value were significantly lower in the postsurgical group compared with the idiopathic and post-traumatic groups (P = .0001 and P = .006, respectively). CONCLUSIONS Arthroscopic capsular release is an effective treatment for refractory shoulder stiffness. Patients with idiopathic and post-traumatic shoulder stiffness have better outcomes than patients with postsurgical stiffness.