ObjectivesHamstring strain injuries (HSIs) commonly affect the proximal biceps femoris long head (BFlh) musculotendinous junction. Biomechanical modeling suggests narrow proximal BFlh aponeuroses and large muscle‐to‐aponeurosis width ratios increase localized tissue strains and presumably risk of HSI. This study aimed to determine if BFlh muscle and proximal aponeurosis geometry differed between limbs with and without a history of HSI.MethodsTwenty‐six recreationally active males with (n = 13) and without (n = 13) a history of unilateral HSI in the last 24 months underwent magnetic resonance imaging of both thighs. BFlh muscle and proximal aponeurosis cross‐sectional areas, length, volume, and interface area between muscle and aponeurosis were extracted. Previously injured limbs were compared to uninjured contralateral and control limbs for discrete variables and ratios, and along the relative length of tissues using statistical parametric mapping.ResultsPreviously injured limbs displayed significantly smaller muscle‐to‐aponeurosis volume ratios (p = 0.029, Wilcoxon effect size (ES) = 0.43) and larger proximal BFlh aponeurosis volumes (p = 0.019, ES = 0.46) than control limbs with no history of HSI. No significant differences were found between previously injured and uninjured contralateral limbs for any outcome measure (p = 0.216–1.000, ES = 0.01–0.36).ConclusionsAponeurosis geometry differed between limbs with and without a history of HSI. The significantly larger BFlh proximal aponeuroses and smaller muscle‐to‐aponeurosis volume ratios in previously injured limbs could alter the strain experienced in muscle adjacent to the musculotendinous junction during active lengthening. Future research is required to determine if geometric differences influence the risk of re‐injury and whether they can be altered via targeted training.

中文翻译：

---

有或没有腿筋拉伤史的男性股二头肌长头肌肉和腱膜几何形状

目的 腿筋拉伤 (HSIs) 通常影响股二头肌近端长头 (BFlh) 肌腱连接处。生物力学模型表明，狭窄的近端 BFlh 腱膜和大的肌肉与腱膜宽度比会增加局部组织应变，并可能增加 HSI 的风险。本研究旨在确定有或没有 HSI 病史的四肢之间 BFlh 肌肉和近端腱膜几何形状是否存在差异。 方法 26 名患有 (n= 13) 且没有 (n= 13) 过去 24 个月内有单侧 HSI 病史，并对双大腿进行了磁共振成像。提取 BFlh 肌肉和近端腱膜横截面积、长度、体积以及肌肉和腱膜之间的界面面积。将先前受伤的肢体与未受伤的对侧和对照肢体进行离散变量和比率的比较，并使用统计参数映射沿着组织的相对长度进行比较。结果先前受伤的肢体显示出明显较小的肌肉与腱膜体积比（p= 0.029，Wilcoxon 效应大小 (ES) = 0.43）和更大的近端 BFlh 腱膜体积（p= 0.019，ES = 0.46）与没有 HSI 病史的对照肢体相比。对于任何结果测量，先前受伤和未受伤的对侧肢体之间没有发现显着差异（p= 0.216–1.000，ES = 0.01–0.36）。结论 有和没有 HSI 病史的肢体之间腱膜的几何形状不同。先前受伤的肢体中明显较大的 BFlh 近端腱膜和较小的肌肉与腱膜体积比可能会改变主动延长期间邻近肌腱连接处的肌肉所经历的应变。未来的研究需要确定几何差异是否会影响再次受伤的风险，以及是否可以通过有针对性的训练来改变它们。