Sacrectomy, Amputation, Hemipelvectomy, Limb salvage surgery, Soft tissue sarcoma surgery, Rotationplasty, Vertebrectom...y, Bone cancer, Rhabdomyosarcoma, Epithelioid sarcoma, Ewing sarcoma, Osteosarcoma, Angiosarcoma, Synovial sarcoma, Bone metastasis, Spinal tumor, Pelvic bone tumor, Vertebral tumor, Malignant peripheral nerve sheath tumors, Leiomyosarcoma, Chondrosarcoma, Myxofibrosarcoma, Solitary fibrous tumor, Undifferentiated pleomorphic sarcoma, Sarcoma, Liposarcoma, Chordoma, Soft tissue sarcoma, Soft tissue tumor, Merkel cell carcinoma, Pancoast tumor, Bone tumor, Dermatofibrosarcoma protuberans