Preoperative Nutrition Impacts Retear Rate After Arthroscopic Rotator Cuff Repair

Background: A rotator cuff retear following arthroscopic rotator cuff repair (ARCR) is a concern in older patients. However, only a few of its risk factors are amenable to preoperative intervention. We aimed to elucidate the relationship between preoperative nutritional status and rotator cuff retears after ARCR. Methods: This single-center retrospective study included patients aged >= 65 years with rotator cuff tears who underwent ARCR. The Geriatric Nutritional Risk Index (GNRI) was used to assess preoperative nutritional status. Data collection encompassed patient demographics, clinical assessments, and surgical specifics. Patients were divided into healed and retear groups based on 2-year post-ARCR magnetic resonance imaging results. Logistic regression analysis was conducted to adjust for confounding factors and detect independent risk factors for retears. The GNRI cutoff value for retear prediction was determined by a stratum-specific likelihood ratio; clinical outcomes were compared based on the cutoff values obtained. Results: Overall, 143 patients were included. The retear rate was 20.3%. The albumin level, GNRI, postoperative shoulder strength of abduction and external rotation, and postoperative Japanese Orthopaedic Association and Constant scores in the retear group were significantly lower than those in the healed group. The logistic regression analysis showed that low risk of morbidity and mortality (compared with no risk) based on the GNRI (odds ratio [OR], 3.39) and medial-lateral tear size per mm (OR = 1.10) were independent risk factors for a retear 2 years after ARCR. Stratum-specific likelihood ratio analysis identified data-driven strata as GNRI < 103, 103 <= GNRI < 109, and GNRI >= 109. Univariate analysis showed that patients with GNRI < 103 had a significantly higher retear risk than those with 103 <= GNRI < 109 and those with GNRI >= 109. Logistic regression analysis showed that GNRI < 103 compared with 103 <= GNRI < 109 (OR = 3.88) and GNRI < 103 compared with GNRI >= 109 (OR = 5.62), along with the medial-lateral tear size per mm (OR = 1.10), were independent risk factors for a retear at 2 years after ARCR. Conclusions: When assessing the risk of a retear after ARCR, GNRI >= 103 may indicate good preoperative nutritional status. However, more data are essential to ascertain the importance of this finding. Level of Evidence: Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.