There are many reasons for the formation of complex wounds in the sacral-lumbar hip, and the common ones are: 1. formation of dead cavity after tumor resection; 2. presence of foreign bodies such as internal fixation plates screws sutures; 3. formation of local infection; 4. cerebrospinal fluid leakage If dural injury occurs, cerebrospinal fluid leakage will occur; 5. presence of tumor tissue or necrotic tissue; 6. pressure; 7. local radiation therapy; 8. low protein and low hemoglobin diabetes immune diseases hormone Use and other systemic conditions. Therefore, the treatment strategy should be to find the appropriate cause, treat it symptomatically, and then use a combination of techniques such as debridement + skin flap + flushing and drainage VSD to achieve a more desirable result.