Increased stiffness and reoperation rate in partial rotator cuff repairs treated with a bovine patch: a propensity-matched trial

Background: Treating high-grade (grade 2 and 3) partial-thickness rotator cuff tears after failed conservative care remains challenging. Arthroscopic repair techniques are often considered with or without subacromial decompression and biological injections. More recently, a bioinductive bovine collagen patch (Regeneten; Smith & Nephew, Memphis, TN, USA) has been proposed to create a healing response and thicken the injured tendon. Although promising early results have been shown, previous studies lacked control subjects or comparison to other surgical treatments. The purpose of this study was to compare the reoperation rates of arthroscopic debridement and repair without a bioinductive collagen patch vs. arthroscopic debridement and repair with a bioinductive collagen patch in patients with high-grade partial-thickness rotator cuff tears in whom a minimum of 6 months of nonoperative treatment failed. Methods: Thirty-two patients with high-grade partial-thickness supraspinatus tears were treated with surgical repair with a bioinductive patch. A control group of 32 patients with high-grade partial-thickness supraspinatus tears treated with debridement or tear completion and repair without a bioinductive patch was selected and matched for age, sex, and tear size. Patients were followed up at regular intervals of 6 weeks, 12 weeks, and 6 months postoperatively, and range of motion was assessed at respective clinic visits. Stiffness and reoperations were compared between groups. Results: Postoperative stiffness was observed in the first 12 weeks in 8 of 32 patients in the patch group compared with 1 of 32 patients in the control group. Six patients in the patch group underwent reoperations compared with no patients in the control group (P<.001). All 6 reoperations in the patch group were performed to address stiffness. There were no differences in race, smoking status, or diabetes between groups (P>.05). Conclusion: Patients in the patch group had a significantly higher rate of postoperative stiffness. In the majority of patients in whom shoulder stiffness developed, reoperation was required. (C) 2022 Journal of Shoulder and Elbow Surgery Board of Trustees. All rights reserved.