Key Laboratory of Exercise and Health Sciences of Ministry of Education, School of kinesiology, Shanghai University of Sport, Shanghai, China; Department of Rehabilitation Medicine, Heping Hospital Affiliated to Changzhi Medical College, Shanxi, China.
Key Laboratory of Exercise and Health Sciences of Ministry of Education, School of kinesiology, Shanghai University of Sport, Shanghai, China.
Gait Posture. 2020 Jan;75:72-77. doi: 10.1016/j.gaitpost.2019.08.009. Epub 2019 Oct 3.
Running-related musculoskeletal injuries are common. Knee injuries are most frequent, and often occur during or shortly after marathons.
The effects of a marathon on runners' knee kinematics remain unclear. No studies have shown comprehensive three-dimensional (3D) knee kinematic changes following a marathon. This study aimed to observe the effects of running a marathon on 3D knee kinematics and identify the phases of walking and running gait in which significant changes occur.
Based on an electronic survey, 10 healthy, recreational runners (20 knees) with similar running experience were included. Their 3D knee kinematics (during treadmill walking and running) were collected using a portable, optical motion capture system within 24 h before and within 6 h after running a marathon.
All measurements after the marathon were compared with pre-marathon measurements. (1) For walking post-marathon: varus rotation increased by 1.8° [95% confidence interval (CI) 0.1-3.4, P = 0.036] at peak knee extension during stance; anterior translation increased by 2.2 mm (95% CI 0.3-4.1, P = 0.025) at initial contact; range of motion (ROM) in internal-external rotation increased less than 1°, P = 0.023; ROM in anteroposterior translation increased by 3.8 mm, P = 0.048. (2) For running post-marathon: flexion rotation increased by 1.6° (95% CI 0.2-2.9, P = 0.025) at initial contact; varus rotation increased by 2.0° (95% CI 0.2-3.8, P = 0.031) at peak knee extension during stance.
Significant differences in varus rotation and anterior translation were identified following a marathon, which could potentially contribute to injury. These results provide important information for runners and coaches about knee kinematic alterations following a marathon.
与跑步相关的肌肉骨骼损伤很常见。膝关节损伤最常见，通常发生在马拉松比赛期间或之后不久。
马拉松对跑步者膝关节运动学的影响仍不清楚。没有研究表明马拉松后会出现全面的三维（3D）膝关节运动学变化。本研究旨在观察马拉松对 3D 膝关节运动学的影响，并确定在步行和跑步步态的哪些阶段会发生显著变化。
基于电子调查，纳入了 10 名具有相似跑步经验的健康、娱乐性跑步者（20 个膝关节）。在马拉松比赛前 24 小时内和比赛后 6 小时内，使用便携式光学运动捕捉系统收集他们在跑步机上行走和跑步时的 3D 膝关节运动学数据。
所有马拉松后的测量值均与马拉松前的测量值进行了比较。（1） 马拉松后行走时：在站立位最大伸展时，内翻旋转增加了 1.8°（95%置信区间 0.1-3.4，P=0.036）；在初始接触时，前向平移增加了 2.2mm（95%置信区间 0.3-4.1，P=0.025）；内外旋转的活动范围（ROM）增加不到 1°，P=0.023；前后平移的 ROM 增加了 3.8mm，P=0.048。（2）马拉松后跑步时：在初始接触时，屈曲旋转增加了 1.6°（95%置信区间 0.2-2.9，P=0.025）；在站立位最大伸展时，内翻旋转增加了 2.0°（95%置信区间 0.2-3.8，P=0.031）。
马拉松后出现了明显的内翻旋转和前向平移差异，这可能会导致损伤。这些结果为跑步者和教练提供了关于马拉松后膝关节运动学变化的重要信息。
