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