An Intra-articular Steroid Injection at 6 Weeks Postoperatively for Shoulder Stiffness After Arthroscopic Rotator Cuff Repair Does Not Affect Repair Integrity.

BACKGROUND: Shoulder stiffness is a common complication after arthroscopic rotator cuff repair. However, there is no consensus on the treatment of stiffness after repair. Although one treatment option is an intra-articular steroid injection, it may negatively affect repair integrity, and there is a paucity of literature regarding the timing of intra-articular injections for stiffness after repair and its effect on repair integrity. PURPOSE: To compare repair integrity and clinical outcomes after an intra-articular steroid injection administered at 6 weeks and 12 weeks postoperatively for shoulder stiffness after arthroscopic rotator cuff repair. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: Patients who developed stiffness after arthroscopic rotator cuff repair were given a series of 3 intra-articular steroid injections every 4 weeks from 6 (6-week group) and 12 weeks (12-week group) postoperatively. The control group had rotator cuff tears but neither stiffness nor injections. Shoulder range of motion (ROM), the Korean Shoulder Scoring System (KSS) score, and the University of California, Los Angeles (UCLA) shoulder score were assessed preoperatively with a minimum of 2-year follow-up. Repair integrity was assessed using magnetic resonance imaging at 6 months postoperatively. RESULTS: Seventy-four of 209 patients (35.4%) who underwent arthroscopic rotator cuff repair developed stiffness. There were no significant differences in retear rates among the 6-week (5.7%, 2/35 patients), 12-week (10.3%, 4/39 patients), and control groups (14.1%, 19/135 patients) ( P = .374). Both the 6- and 12-week groups showed significant improvement in ROM (both P < .001), KSS scores (both P < .001), and UCLA scores (both P < .001) at the final follow-up. The 6-week group showed significantly better ROM ( P < .001), KSS scores ( P < .001), and UCLA scores ( P < .001) than the 12-week group at 3 months postoperatively. However, both the 6- and 12-week groups showed significantly lower KSS (81.3 ± 12.0 [ P = .004] and 83.4 ± 8.6 [ P = .035], respectively) and UCLA (29.3 ± 4.6 [ P = .006] and 30.0 ± 3.3 [ P = .042], respectively) scores than the control group (90.4 ± 13.6 and 32.3 ± 4.7, respectively) at the last follow-up. CONCLUSION: An intra-articular steroid injection administered at 6 weeks postoperatively for shoulder stiffness after arthroscopic rotator cuff repair may be effective for reducing patients' pain and improving shoulder ROM at 3 months postoperatively without compromising repair integrity.