• Kyoung Hwan Koh, Tae Kang Lim, Min Soo Shon, Young Eun Park, Seung Won Lee, and Jae Chul Yoo.
• Department of Orthopaedic Surgery, Seoul Medical Center, 156 Sinnae-ro, Jungnang-gu, Seoul 131-130, South Korea. E-mail address: osdoc.koh@gmail.com.
• J Bone Joint Surg Am. 2014 Mar 19; 96 (6): e44.

BackgroundWhile animal studies have shown better healing with a longer duration of protection without motion exercise after rotator cuff repair, supporting clinical studies are rare. The purpose of this study was to assess the effect of immobilization following rotator cuff repair and to determine whether there was any difference in clinical outcome related to the duration of immobilization.MethodsOne hundred patients who underwent arthroscopic single-row repair of a posterosuperior rotator cuff tear (mean, 2.3 cm in the coronal-oblique plane and 2.0 cm in the sagittal-oblique plane) were prospectively randomized to be treated with immobilization for four or eight weeks. During the immobilization period, no passive or active range-of-motion exercise, including pendulum exercise, was allowed. According to the intention-to-treat protocol and full analysis set, eighty-eight patients were evaluated clinically and with magnetic resonance imaging postoperatively, after exclusion of twelve patients without postoperative clinical evaluation. Ranges of motion, clinical scores, and retear rates were compared between the four and eight-week groups. Ninety-eight patients were contacted by telephone at a mean of thirty-five months to investigate the clinical outcomes.ResultsThe mean duration of immobilization was 4.1 weeks in the four-week group and 7.3 weeks in the eight-week group. There were nine full-thickness retears (10%), and 89% of the patients rated their result as excellent or good. There were five full-thickness retears in the four-week group and four in the eight-week group (p = 0.726). At the time of final follow-up, the two groups showed no differences in range of motion or clinical scores. However, the proportion showing stiffness was higher in the eight-week group (38% compared with 18%, p = 0.038).ConclusionsEight weeks of immobilization did not yield a higher rate of healing of medium-sized rotator cuff tears compared with four weeks of immobilization.

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