Anterior cruciate ligament (ACL) injury videos estimate that rupture occurs within 50 milliseconds of initial contact, but are limited by imprecise timing and nondirect data acquisition. The objective of this study was to precisely quantify the timing associated with ligament strain during simulated landing and injury events. The hypotheses tested were that the timing of peak strain following initial contact would differ between ligaments and that peak strain timing would be independent of the injury-risk profile emulated during simulated landing. A mechanical impact simulator was used to perform landing simulations based on various injury-risk profiles that were applied to each specimen in a block-randomized order. The ACL and medial collateral ligament were instrumented with strain gauges that recorded continuously. The data from 35 lower-extremity specimens were included for analysis. Analysis of variance and Kruskal–Wallis tests were used to determine the differences between timing and profiles. The mean time to peak strain was 53 (24) milliseconds for the ACL and 58 (35) milliseconds for the medial collateral ligament. The time to peak ACL strain ranged from 48 to 61 milliseconds, but the timing differences were not significant between profiles. Strain timing was independent of injury-risk profile. Noncontact ACL injuries are expected to occur between 0 and 61 milliseconds after initial contact. Both ligaments reached peak strain within the same time frame.

前十字韧带 (ACL) 损伤视频估计破裂发生在初次接触后 50 毫秒内，但受到时间不精确和非直接数据采集的限制。本研究的目的是精确量化模拟着陆和受伤事件期间与韧带拉伤相关的时间。测试的假设是，初始接触后的峰值应变时间在韧带之间会有所不同，并且峰值应变时间将独立于模拟着陆期间模拟的受伤风险状况。机械冲击模拟器用于根据各种伤害风险概况进行着陆模拟，这些风险概况以块随机顺序应用于每个样本。ACL 和内侧副韧带配备了连续记录的应变仪。来自 35 个下肢样本的数据被纳入分析。方差分析和 Kruskal-Wallis 检验用于确定时间和配置文件之间的差异。ACL 达到峰值应变的平均时间为 53 (24) 毫秒，内侧副韧带达到峰值应变的平均时间为 58 (35) 毫秒。ACL 应变达到峰值的时间范围为 48 至 61 毫秒，但不同曲线之间的时间差异并不显着。应变时间与受伤风险状况无关。非接触性 ACL 损伤预计会在初次接触后 0 到 61 毫秒内发生。两条韧带在同一时间范围内达到峰值应变。