Bone destruction of left iliac bone can be treated by surgery and medication, etc. The causes of bone destruction of left iliac bone may be osteomyelitis, bone tuberculosis, primary bone tumor and so on. 1. Osteomyelitis: If the left iliac bone is infected by bacteria or virus, causing inflammatory lesions, it will stimulate the destruction of bone, and if necrosis, abscess and other serious conditions occur, it is necessary to go to the hospital in time to be treated by surgery. 2. Bone tuberculosis: If the body resistance is poor and the body is strained, it will be infected by tuberculosis bacteria and cause bone tuberculosis, which will lead to generalized weakness, loss of appetite, and so on, and will lead to the destruction of bone quality in serious cases, and it can be treated with medicines such as rifampicin tablets and ethambutol tablets on the recommendation of doctors, and it is necessary to avoid overwork in the daily life. 3. Primary bone tumor: If the left iliac bone has occupying lesion, causing tumor, it can lead to primary bone tumor disease, which can be benign or malignant tumor, both of them will stimulate the bone and cause bone destruction, you should go to the hospital regularly through CT, MRI and other medical examinations, according to the doctor’s opinion, and treat it through surgical resection. If the left iliac bone destruction occurs, go to the hospital as soon as possible to do a detailed examination and treat the cause.