Although head injuries are common in cycling, exact conditions associated with cyclist head impacts are difficult to determine. Previous studies have attempted to reverse engineer cyclist head impacts by reconstructing bicycle helmet residual damage, but they have been limited by simplified damage assessment and testing. The present study seeks to enhance knowledge of cyclist head impact conditions by reconstructing helmet damage using advanced impact testing and damage quantification techniques. Damage to 18 helmets from cyclists treated in emergency departments was quantified using computed tomography and reconstructed using oblique impacts. Damage metrics were related to normal and tangential velocities from impact tests as well as peak linear accelerations (PLA) and peak rotational velocities (PRV) using case-specific regression models. Models then allowed original impact conditions and kinematics to be estimated for each case. Helmets were most frequently damaged at the front and sides, often near the rim. Concussion was the most common, non-superficial head injury. Normal velocity and PLA distributions were similar to previous studies, with median values of 3.4 m/s and 102.5 g. Associated tangential velocity and PRV medians were 3.8 m/s and 22.3 rad/s. Results can inform future oblique impact testing conditions, enabling improved helmet evaluation and design.

尽管骑自行车时头部受伤很常见，但很难确定与骑车人头部撞击相关的确切情况。以前的研究试图通过重建自行车头盔的残余损伤来逆向工程骑自行车的人头部撞击，但它们受到简化的损伤评估和测试的限制。本研究旨在通过使用先进的撞击测试和损坏量化技术重建头盔损坏来增强对骑自行车者头部撞击情况的了解。在急诊室接受治疗的骑自行车者对 18 顶头盔的损坏使用计算机断层扫描进行量化，并使用斜向撞击进行重建。损伤指标与来自冲击测试的法向和切向速度以及峰值线性加速度 (PLA) 和峰值旋转速度 (PRV) 相关，使用特定于案例的回归模型。然后，模型允许为每种情况估计原始撞击条件和运动学。头盔最常在正面和侧面受损，通常在边缘附近。脑震荡是最常见的非浅表性头部损伤。法向速度和 PLA 分布与之前的研究相似，中值为 3.4 m/s 和 102.5 g。相关的切向速度和 PRV 中值分别为 3.8 m/s 和 22.3 rad/s。结果可以为未来的倾斜冲击测试条件提供信息，从而改进头盔的评估和设计。4 m/s 和 102.5 g。相关的切向速度和 PRV 中值分别为 3.8 m/s 和 22.3 rad/s。结果可以为未来的倾斜冲击测试条件提供信息，从而改进头盔的评估和设计。4 m/s 和 102.5 g。相关的切向速度和 PRV 中值分别为 3.8 m/s 和 22.3 rad/s。结果可以为未来的倾斜冲击测试条件提供信息，从而改进头盔的评估和设计。