NEUROMECHANICS OF KNEE EXTENSOR/MALALIGNMENT

描述（改编自申请人的摘要）：该项目寻求 来量化伸肌的机械和神经肌肉变化 髌骨排列不良患者髌股关节疼痛的机制 带/不带髌骨胶带。髌股关节疼痛是最常见的 运动医学诊所常见的投诉。它是假设 股四头肌之间的负荷分配，收缩延迟和机械 动作在膝关节的个人股四头肌头，和髌骨 髌骨对线不良显著改变了轨迹。 为了确定在体内等长膝关节伸展之间的负荷分配， 股四头肌成分，不同强度的电刺激 将用于选择性地激活单个股四头肌头部， 各种收缩水平，以及M波和 不同收缩水平的等长膝关节伸展力矩将 为每个股四头肌建立。接下来，受试者将 自发地产生一定水平的等长膝关节伸展扭矩 并且将使用用于记录M波信号的相同电极 来测量肌电信号上述M波与 和每个股四头肌头部的伸展扭矩将用于将 个体肌肉的EMG到个体肌肉的扭矩，从而 确定股四头肌组件之间的载荷分担。负载的变化 股内侧斜肌和股外侧肌之间的共享 髌骨排列不良将被量化。 此外，收缩延迟（从一个激活的开始， 单个股四头肌组件向关节产生的起始扭矩 仅由相同的单独的股四头肌组件）和机械的 单个股四头肌组件的动作将由 选择性地激活股四头肌头部并测量结果， 膝关节屈曲-伸展、外展-内收和内外 旋转力矩膝关节伸展期间诱导的髌骨轨迹将 使用光电系统和使用 荧光镜。髌骨引起的上述性质的变化 髌骨贴扎引起的对线不良和矫正， 使用上述设计进行量化。

DESCRIPTION (Adapted from the Applicant's Abstract): This project seeks to quantify the mechanical and neuromuscular changes in the extensor mechanism of patellofemoral pain patients with patellar malalignment and with/without patellar taping. Patellofemoral pain is one of the most common complaints in sports medicine clinics. It is hypothesized that load sharing among the quadriceps, the contraction delay and mechanical actions at the knee of individual quadriceps heads, and patellar tracking are changed significantly by patellar malalignment. To determine in vivo isometric knee extension load sharing among the quadriceps components, electrical stimulation of different intensities will be used to activate an individual quadriceps head selectively at various contraction levels, and the relationship between the M-wave and isometric knee extension moment over different contraction levels will be established for each quadriceps head. Next, the subject will voluntarily generate certain levels of isometric knee extension torque and the same electrodes used to record the M-wave signals will be used to measure the EMG signals. The above relationship between the M-wave and extension torque of each quadriceps head will be used to relate an individuals muscle's EMG to the individual muscle's torque and thus determine load sharing among the quadriceps components. Changes in load sharing between vastus medialis oblique and vastus lateralis caused by patellar malalignment will be quantified. In addition, contraction delay (from the onset of activation of an individual quadriceps component to the onset of joint torque generated solely by the same individual quadriceps component) and mechanical actions of the individual quadriceps components will be determined by activating a quadriceps head selectively and measuring the resultant knee flexion-extension, abduction-adduction, and internal-external rotation moments. Patellar tracking induced during knee extension will be quantified noninvasively using an optoelectrical system and using a fluoroscope. Changes in the above properties induced by patellar malalignment and correction induced by patellar taping will be quantified using the above designs.