A lumbar burst fracture with urinary weakness may be a result of fracture damage to the cauda equina nerve, which requires prompt surgical treatment to avoid aggravation of the nerve injury. When the lumbar burst fracture compresses the lumbar spinal canal at the back, it is easy to cause nerve injury due to the broken fracture pieces, which can cause urinary obstruction or incontinence, abnormal sensation in the saddle area and other manifestations when the injury is caused to the cauda equina. When the cauda equina is injured due to lumbar burst fracture, it needs to be treated as soon as possible, and in most cases, emergency surgery will be performed to deal with the fracture and at the same time conduct nerve exploration and repair treatment, so as to avoid aggravation of nerve injury by the fracture and to promote the recovery in the later stage. If you have a burst fracture of the lumbar spine and have weakness in urination, you should consult a hospital as soon as possible and receive treatment.