Onoda Yuki, Kitagawa Takashi
Department of Rehabilitation, Hanamizuki Orthopedic Sports Clinic, 1-18-8 Kiyosu, Kiyosu, 452-0942, Japan.
Department of Physical Therapy, School of Health Sciences, Shinshu University, 3-1-1 Asahi, Matsumoto, 390-8621, Japan.
J Orthop Sci. 2024 Sep;29(5):1183-1187. doi: 10.1016/j.jos.2023.09.004. Epub 2023 Oct 25.
Lumbar spondylolysis (LS) is a lumbar vertebral arch stress fracture that often occurs in adolescent athletes, especially baseball players. An increase in lumbar lordosis angle (LLA) increases the compressive stress on the vertebral arch, influencing the development of LS. However, the effect of LLA on LS development in adolescent baseball players is unknown. Therefore, it is necessary to elucidate the risk factors that influence the development of LS. This cross-sectional study aimed investigate the effect of LLA on LS development in adolescent baseball players.
Patients were male baseball players aged 11-18 years who visited an orthopedic clinic with a chief complaint of lumbar pain and underwent a magnetic resonance imaging (MRI) examination between January 1, 2018, and October 31, 2021. LLA was defined as the angle formed by the line parallel to the superior endplate of the L1 and S1. A person other than the data analyst measured LLA three times from the MRI, and the average value was used for data analysis. Logistic regression analysis was performed, with the presence or absence of LS as the objective variable and LLA, age, and previous pitching experience as explanatory variables.
Of the 112 subjects included, 79 were in the LS group and 33 in the non-LS group. The LLA was 45.42 ± 8.19° in the LS group and 36.68 ± 8.26° in the non-LS group, with significant differences between the groups. Logistic regression analysis showed that LLA significantly differed with an odds ratio of 1.140 (95% confidence interval: 1.070-1.21), even after adjusting for age and previous pitching experience.
LLA in adolescent baseball players was significantly greater in the LS group than in the non-LS group, which may influence the development of LS.
腰椎峡部裂（LS）是一种腰椎椎弓应力性骨折，常见于青少年运动员，尤其是棒球运动员。腰椎前凸角（LLA）增大可增加椎弓的压应力，影响LS的发生发展。然而，LLA对青少年棒球运动员LS发生发展的影响尚不清楚。因此，有必要阐明影响LS发生发展的危险因素。本横断面研究旨在探讨LLA对青少年棒球运动员LS发生发展的影响。
研究对象为年龄在11 - 18岁的男性棒球运动员，他们因腰部疼痛为主诉就诊于骨科门诊，并于2018年1月1日至2021年10月31日期间接受了磁共振成像（MRI）检查。LLA定义为平行于L1和S1上终板的直线所形成的角度。由数据分析人员以外的人员从MRI上测量LLA三次，取平均值用于数据分析。以是否存在LS作为目标变量，LLA、年龄和既往投球经历作为解释变量进行逻辑回归分析。
纳入的112名受试者中，79名在LS组，33名在非LS组。LS组的LLA为45.42±8.19°，非LS组为36.68±8.26°，两组间差异有统计学意义。逻辑回归分析显示，即使在调整年龄和既往投球经历后，LLA仍有显著差异，比值比为1.140（95%置信区间：1.070 - 1.21）。
青少年棒球运动员中，LS组的LLA显著高于非LS组，这可能影响LS的发生发展。
