Orthopaedic oncologists are orthopaedic surgeons who have received extra training and experience in treating cancers and tumours of the bones, joints, and muscles. Orthopaedic oncologists deal with a variety of cancers, including: Primary bone cancer Soft tissue sarcomas Breast, colon, and prostate cancers that have spread to the bones and illnesses and difficulties that emerge as a result of cancer or as a treatment side effect.