Knee replacement, Hip replacement, Bone reconstruction, Bone metastasis surgery, Pelvic tumor surgery, Peripheral nerve... tumor surgery, Arthroplasty, Soft tissue sarcoma surgery, Knee replacement revision, Hip replacement revision, Sarcoma, Bone cancer, Bone metastasis, Soft tissue sarcoma, Pelvic bone tumor, Hip arthritis, Bone tumor, Failed total knee replacement, Knee arthritis, Failed total hip replacement, Soft tissue tumor, Pelvic sarcoma, Periprosthetic joint infection