Compression of the spinal capsule is usually an imaging finding on MRI and CT, and is due to a herniated disc in the cervical or lumbar spine, as well as hyperplasia and calcification of the posterior longitudinal ligament and ligamentum flavum, resulting in narrowing of the spinal canal, which can lead to compression of the spinal capsule, the outermost layer of the spinal cord. This condition is usually caused by excessive strain on the cervical and lumbar spine, which leads to cracks and ruptures in the fibular rings of the spine due to degeneration and extrusion of the nucleus pulposus, or excessive strain on the ligamentum flavum and the posterior longitudinal ligament, which leads to inflammatory hyperplasia and gradual narrowing of the spinal canal. Sometimes there may be numbness, pain and weakness in the extremities, as well as radiating pain and numbness in the lower extremities, and there may also be significant numbness in the saddle area, which is the location of urination and defecation, affecting urination and defecation dysfunction, and sexual dysfunction.