Hemiplegia is the most common neurological condition with neurological deficits. The most common causes are cerebrovascular disease, such as cerebral hemorrhage and cerebral infarction, and lesions of the spinal cord. Muscle strength is generally classified into 0-5 levels: Level 0 is complete paralysis, no muscle contraction can be measured. level 1 has muscle contraction, but the limb cannot produce movement. level 2 can move the limb horizontally on the bed, but cannot resist gravity and cannot be lifted off the bed. level 3 can lift the limb off the bed, but cannot resist external resistance. level 4 can lift off the bed and can also resist weak external resistance. level 5 is the muscle strength of a normal person. The muscle strength. Generally speaking, the prognosis for patients with muscle strength below level 3 is relatively poor, while patients with muscle strength above level 3 generally have a better prognosis for neurological deficits if they are given more formal rehabilitation.