With the continuous improvement of imaging and medical devices, the concept of precision medicine is put forward by more doctors, which also brings more convenience to patients. Our department carries out intraoperative CT fluoroscopic technology for minimally invasive treatment of bone tumors, which uniquely possesses its advantages: 1. Precision: The principle of tumor treatment requires complete resection. Intraoperative CT navigation allows surgeons to judge the integrity of tumor resection through imaging on the basis of tumor resection seen by the naked eye, which can minimize the possibility of tumor recurrence. 2. Minimally invasive: The surgery is performed through CT navigation to find the lesion site, allowing the surgeon to complete the entire operation through small incisions, reducing the damage to normal tissues, reducing the risk of infection in major surgery, and reducing the postoperative recovery time. 3.Safety: Finding the best surgical access after positioning through imaging, avoiding important blood vessels and nerves, reducing the risk of complications from traditional surgery. 4.Simple operation: Due to the precise positioning and safe access, the surgical operation and anesthesia time are reduced. Early postoperative discharge. Reduce medical costs. Indications: 1.Puncture biopsy of malignant tumor of pelvis, sacrum and spine; 2.Bone cement filling or particle placement under navigation for malignant tumor of pelvis, sacrum and spine; 3.Sub-total resection of vertebral body, decompression of spinal canal and fixation of internal fixation placement under navigation for malignant tumor of spine (metastatic cancer) in elderly; 4.Scraping or intracapsular resection of benign tumor lesions of limbs (upper limbs and lower limbs) (lesion range <50px) Endogenous chondrosarcoma 5. Intracapsular scraping of benign tumors of the foot and ankle, scapula, pelvis, etc. (irregular bone) Iliac tumor resection under navigation Small incision for distal femoral tumor CT navigation operation