Department of Sports Medicine, Fukushima Medical University, Fukushima, Japan; Otoshi Orthopaedic Clinic, Fukushima, Japan.
Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan.
J Shoulder Elbow Surg. 2019 Jun;28(6):1098-1103. doi: 10.1016/j.jse.2019.02.005. Epub 2019 Apr 16.
Several guidelines for the prevention of throwing injuries recommend a sufficiently long off-season; however, few studies providing scientific evidence to support these recommendations exist. Our study aimed to clarify the association between off-season duration and throwing elbow injuries among elementary school-aged baseball players.
This study enrolled 680 elementary school-aged baseball players who underwent medical checkups. The experience with elbow pain and the off-season duration were investigated via the administration of a self-completed questionnaire. Ultrasonographic assessment of the elbow joint was performed on the day of the medical checkup to assess for morphologic abnormalities.
The prevalence of elbow pain and morphologic abnormalities of the medial epicondyle (medial epicondyle lesions) was significantly decreased when the subjects' off-season duration was longer. Multivariate analysis revealed that the risk of elbow pain was significantly lower in the group whose off-season lasted 1 to 2 months (odds ratio [OR], 0.32; 95% confidence interval [CI], 0.15-0.62; P = .0006) and in the group whose off-season lasted longer than 2 months (OR, 0.59; 95% CI, 0.37-0.95; P = .0316). The risk of medial epicondyle lesions was also significantly lower in the group whose off-season lasted 1 to 2 months (OR, 0.39; 95% CI, 0.22-0.67; P = .0005) and in the group whose off-season lasted longer than 2 months (OR, 0.36; 95% CI, 0.23-0.56; P < .0001). On the contrary, no significant correlation was found between capitellar osteochondritis dissecans and off-season duration.
Off-season duration has a significant correlation with elbow pain and morphologic abnormalities of the medial elbow joint in elementary school-aged baseball players.
有几项投掷伤预防指南建议运动员进行足够长的停训期；但目前仅有少数研究能够提供科学依据支持这些建议。本研究旨在明确小学生棒球运动员停训期与投肘伤之间的关系。
本研究纳入了 680 名接受体检的小学生棒球运动员。通过自我报告的问卷调查了解其肘部疼痛史和停训期。在体检日对肘部进行超声检查，评估关节形态是否异常。
当停训期较长时，肘部疼痛和内侧上髁形态异常（内侧上髁病变）的发生率显著降低。多变量分析显示，停训 1 至 2 个月（优势比 [OR]，0.32；95%置信区间 [CI]，0.15-0.62；P =.0006）和停训期超过 2 个月（OR，0.59；95% CI，0.37-0.95；P =.0316）的运动员肘部疼痛风险显著降低。停训 1 至 2 个月（OR，0.39；95% CI，0.22-0.67；P =.0005）和停训期超过 2 个月（OR，0.36；95% CI，0.23-0.56；P <.0001）的运动员内侧上髁病变风险也显著降低。相反，肱骨小头骺软骨病与停训期之间无显著相关性。
停训期与小学生棒球运动员肘部疼痛和内侧肘部形态异常显著相关。
