If it's overactive, meaning it's too jumpy, it can signal a problem with an upper motor neuron, something in the spinal cord above the level of the knee jerk reflex, which is L3, L4, or something in the brain.
如果它过度活跃，意味着它太紧张，它可能表明上运动神经元有问题，脊髓中高于膝跳反射水平的东西，也就是 L3、L4 或大脑中的东西。
![膝跃反射(膝跳反射)](/Images/godic/202501/22/Patellar-knee-reflex3236.png")
![Schematic representation of patellar tendon reflex (knee jerk) pathway](/Images/godic/202501/22/Patellar_tendon_reflex_arc3236.png")