Objective

The aim of this study was to determine the impacts of anterior cruciate ligament reconstruction (ACLR) and recent (< 12 months) hamstring strain injury (HSI) on (1) future HSI risk, and (2) eccentric knee flexor strength and between-limb imbalance during the Nordic hamstring exercise. A secondary goal was to examine whether eccentric knee flexor strength was a risk factor for future HSI in athletes with prior ACLR and/or HSI.

Methods

In this prospective cohort study, 531 male athletes had preseason eccentric knee flexor strength tests. Injury history was also collected. The main outcome was HSI occurrence in the subsequent competitive season.

Results

Overall, 74 athletes suffered at least one prospective HSI. Compared with control athletes, those with a lifetime history of ACLR and no recent HSI had 2.2 (95% confidence interval [CI] 1.1–4.4; p = 0.029) times greater odds of subsequent HSI while those with at least one HSI in the previous 12 months and no history of ACLR had 3.1 (95% CI 1.8–5.4; p < 0.001) times greater odds for subsequent HSI. Only athletes with a combined history of ACLR and recent HSI had weaker injured limbs (p = 0.001) and larger between-limb imbalances (p < 0.001) than uninjured players. An exploratory decision tree analysis suggested eccentric strength may protect against HSI after ACLR.

Conclusion

ACLR and recent HSI were similarly predictive of future HSI. Lower levels of eccentric knee flexor strength and larger between-limb imbalances were found in athletes with combined histories of ACLR and recent HSI. These findings may have implications for injury rehabilitation.

中文翻译：

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前交叉韧带重建增加了澳大利亚足球规范中腿筋拉伤的风险

客观的

本研究的目的是确定前交叉韧带重建 (ACLR) 和近期（<12 个月）腘绳肌劳损 (HSI) 对 (1) 未来 HSI 风险和 (2) 偏心膝屈肌力量和之间的影响 -北欧腘绳肌锻炼时肢体不平衡。次要目标是检查偏心膝屈肌力量是否是既往有 ACLR 和/或 HSI 的运动员未来 HSI 的危险因素。

方法

在这项前瞻性队列研究中，531 名男性运动员进行了季前膝关节屈肌力量测试。还收集了受伤史。主要结果是在随后的竞争赛季中出现恒指。

结果

总体而言，74 名运动员至少遭受了一次预期 HSI。与对照组运动员相比，那些终生有 ACLR 病史且近期无 HSI 的运动员随后发生 HSI 的几率是之前至少有一次 HSI 的运动员的 2.2（95% 置信区间 [CI] 1.1-4.4；p  = 0.029）倍12 个月且无 ACLR 病史的后续 HSI 几率高出 3.1 (95% CI 1.8–5.4; p  < 0.001) 倍。只有具有 ACLR 和近期 HSI 病史的运动员比未受伤的运动员有较弱的受伤肢体 ( p  = 0.001) 和更大的肢体间不平衡 ( p  < 0.001)。探索性决策树分析表明，离心力量可以在 ACLR 后预防 HSI。

结论

ACLR 和近期的恒指同样可以预测未来的恒指。在具有 ACLR 和近期 HSI 病史的运动员中发现了较低水平的离心膝屈肌力量和较大的肢体间不平衡。这些发现可能对损伤康复有影响。