Lumbar compression fracture and lack of strength in the legs may be caused by nerve damage and prolonged bed rest due to the fracture. 1. Nerve injury: lumbar compression fracture itself may cause spinal nerve roots or spinal nerves to be damaged, if it affects the nerve fiber conduction of the motor system, it may cause a decrease in muscle power or even paralysis in the innervated area. Most of the nerves need a long time to recover after the injury, usually 3~6 months, and the possibility of recovery for patients with complete injury is relatively small. 2. Bed rest: Lumbar vertebrae compression fracture, whether conservative treatment or surgical treatment need to be bedridden for a period of time, during the bed rest period due to the bones of the lower limbs as well as the muscles and other soft tissues and other soft tissue less than the stress stimulation may cause osteoporosis, muscle atrophy and other conditions, may also appear the symptoms of weakness of the legs. Lumbar spine compression fracture leg weakness may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.