Why do patients have claudication? Intermittent claudication would have been the main feature of lumbar spinal stenosis, due to narrowing of the spinal canal as a result of a herniated lumbar disc. Why does a patient with claudication ride a bicycle normally? When the patient rides a bicycle, the person’s posture is in a stooped position, i.e., the lumbar spine is convex posteriorly, which relieves the compression of the nerves by the spinal stenosis. Abnormal sensation in the lower limbs What happens when a patient develops leg twitching? After long-term compression of the nerve root, the nerve ependymal membrane or fibrosis between the nerve bundles increases the stress threshold of the sensory fibers of the nerve root. What happened to the patient’s lower limbs feeling numb? Caused by compression of the nerve’s proprioceptive and tactile fibers by the intervertebral disc tissue. How to differentiate between lumbar transverse disc herniation and lower limb sensory abnormality caused by stroke: the lower limb sensory activity disorder of lumbar herniation is mainly manifested as the pain, numbness and reduced strength of one or both lower limbs, and the limb abnormality caused by stroke is manifested as the limb sensory activity disorder of one side of the limb, including the upper limb and the lower limb are showing the weakness and the increase of muscle tension. Does the patient have to feel discomfort in one side of the lower limb? A few patients may have symptoms in both lower limbs. Why do some patients have different thickness of both lower limbs? Damage caused by compression of the nerve root will result in muscular lesions of the lower limbs in the area innervated by the nerve root, which will be manifested by muscle atrophy and loss of muscle strength.