Fiorentino Niccolo M, Blemker Silvia S
Department of Mechanical & Aerospace Engineering, University of Virginia, Charlottesville, VA, USA.
Department of Mechanical & Aerospace Engineering, University of Virginia, Charlottesville, VA, USA; Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, USA.
J Biomech. 2014 Oct 17;47(13):3325-33. doi: 10.1016/j.jbiomech.2014.08.010. Epub 2014 Aug 16.
The hamstring muscles frequently suffer injury during high-speed running, though the factors that make an individual more susceptible to injury remain poorly understood. The goals of this study were to measure the musculotendon dimensions of the biceps femoris long head (BFlh) muscle, the hamstring muscle injured most often, and to use computational models to assess the influence of variability in the BFlh's dimensions on internal tissue strains during high-speed running. High-resolution magnetic resonance (MR) images were acquired over the thigh in 12 collegiate athletes, and musculotendon dimensions were measured in the proximal free tendon/aponeurosis, muscle and distal free tendon/aponeurosis. Finite element meshes were generated based on the average, standard deviation and range of BFlh dimensions. Simulation boundary conditions were defined to match muscle activation and musculotendon length change in the BFlh during high-speed running. Muscle and connective tissue dimensions were found to vary between subjects, with a coefficient of variation (CV) of 17±6% across all dimensions. For all simulations peak local strain was highest along the proximal myotendinous junction, which is where injury typically occurs. Model variations showed that peak local tissue strain increased as the proximal aponeurosis width narrowed and the muscle width widened. The aponeurosis width and muscle width variation models showed that the relative dimensions of these structures influence internal muscle tissue strains. The results of this study indicate that a musculotendon unit's architecture influences its strain injury susceptibility during high-speed running.
腘绳肌在高速奔跑过程中经常受伤，不过导致个体更容易受伤的因素仍未得到充分了解。本研究的目的是测量最常受伤的腘绳肌——股二头肌长头（BFlh）的肌肉肌腱尺寸，并使用计算模型评估BFlh尺寸变化对高速奔跑期间内部组织应变的影响。对12名大学生运动员的大腿进行了高分辨率磁共振（MR）成像，并测量了近端游离肌腱/腱膜、肌肉和远端游离肌腱/腱膜的肌肉肌腱尺寸。基于BFlh尺寸的平均值、标准差和范围生成了有限元网格。定义了模拟边界条件，以匹配高速奔跑期间BFlh中的肌肉激活和肌肉肌腱长度变化。发现受试者之间的肌肉和结缔组织尺寸存在差异，所有尺寸的变异系数（CV）为17±6%。在所有模拟中，局部峰值应变在近端肌腱结合处最高，而此处通常是损伤发生的部位。模型变化表明，随着近端腱膜宽度变窄和肌肉宽度变宽，局部峰值组织应变增加。腱膜宽度和肌肉宽度变化模型表明，这些结构的相对尺寸会影响内部肌肉组织应变。本研究结果表明，肌肉肌腱单元的结构会影响其在高速奔跑期间的应变损伤易感性。
