If the lumbar spinal nail is not removed, it may become inflamed and even produce complications such as rejection reaction and lumbar stiffness. 1. Inflammation: If the lumbar spinal nails are not removed, they will be easily loosened, dislodged, or even broken during daily activities, resulting in aseptic inflammation of the local area, redness, swelling, chronic pain, and limited lumbar spine activities. 2. Rejection reaction: lumbar spine nail is not removed, if the patient appears lumbar spine part of excessive force activities, may cause the breakage of the steel nail, and the metabolism is vigorous, easy to cause rejection reaction of the steel nail, causing lumbar spine pain and other symptoms. 3. Lumbar stiffness: If the lumbar nail is not removed, it may be covered by the bone, leading to an increase in the area of lumbar spine ossification, resulting in persistent lumbar stiffness, affecting the range of lumbar spine activities, which will also have an impact on life and work. Consultation with a medical professional is recommended for specific cases.