Why does the bone on the butt stick out?

Bone protrusion above the buttocks may be caused by the following reasons: 1. This situation may be caused by normal bony processes, such as normal bony processes such as posterior superior iliac spine and lumbar spine above the buttocks. In the process of thinner patients or bending, these bony processes will be very obvious. This is a physiological state. 2. It may be caused by the deformity of the spine, such as when the patient shows a series of deformities such as scoliosis or kyphosis, there may be obvious bony processes here. 3. This situation may be caused by old injuries, such as the patient has an old lumbar compression fracture or a lumbar spinous process fracture, which may cause the spinous process behind the lumbar spine to become abnormal. 4. In addition, if the patient has osteoporosis, there may be continued pathological fractures of the vertebral body, resulting in the posterior spinous process becoming very prominent. 5. This condition may be caused by space-occupying diseases of the bone here, such as bone tumors.