NEUROMECHANICS OF KNEE EXTENSOR/MALALIGNMENT

描述(改编自申请者摘要)：本项目寻求 量化伸肌的机械和神经肌肉变化 髌股关节痛合并髌骨排列不良的机制及临床意义 带/不带膝盖骨胶带。膝骨股关节痛是最常见的 运动医学诊所常见的主诉。据推测， 股四头肌之间的负荷分配、收缩延迟和机械 单个股四头肌和膝盖骨的膝部动作 跟踪明显改变，因为膝盖骨排列不齐。 在活体内确定等长伸膝负荷在 不同强度的电刺激股四头肌部件 将用于有选择地激活单个股四头肌头部 不同收缩水平，以及M波与 不同收缩水平的等长伸膝力矩将 为每个股四头肌建立。接下来，主题将 自愿产生一定水平的等长伸膝扭矩 并且将使用用于记录M波信号的相同电极 以测量肌电信号。上述M波之间的关系 并用每个股四头肌头部的伸展扭矩来关联 个体肌肉的肌电与个体肌肉的扭矩，因此 确定股四头肌组件之间的负荷分担。负荷的变化 股内侧斜肌与股外侧肌的共享 膝盖骨的排列不齐将被量化。 此外，收缩延迟(从激活的开始 单个股四头肌组件开始时产生的关节扭矩 仅由相同的单个股四头肌部件)和机械 各个股四头肌组件的动作将由以下因素决定 有选择地激活股四头肌并测量其结果 膝关节屈曲--伸展、外展--内收和内外 旋转力矩。在伸膝过程中产生的膝盖骨轨迹将 使用光电系统和使用 透视镜。由膝盖骨引起的上述特性的改变 由髌骨捆扎引起的排列不正和矫正将是 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.