There are over 200 bones in the human body, any of these can be affected by cancer. However, certain types of bone cancer are more common in specific bones. Osteosarcoma is most commonly found in the bones around the knee. Ewing's sarcoma is more common in the upper leg, pelvis and other bones of the trunk. The pelvis is the most frequent location for chondrosarcoma. Nevertheless, it is possible for these cancers to affect any bone in the body.