Amputation, Joint replacement surgery, Rotationplasty, Limb salvage surgery, Sarcoma, Bone cancer, Chondrosarcoma, Oste...osarcoma, Bone metastasis, Soft tissue sarcoma, Merkel cell carcinoma, Solitary fibrous tumor, Ewing sarcoma, Liposarcoma, Undifferentiated pleomorphic sarcoma, Angiosarcoma, Synovial sarcoma, Myxofibrosarcoma, Epithelioid sarcoma, Rhabdomyosarcoma, Dermatofibrosarcoma protuberans, Leiomyosarcoma, Malignant peripheral nerve sheath tumors, Bone tumor, Soft tissue tumor, Nerve sheath tumor