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