The Scandinavian Sarcoma Group (SSG) has initiated a Skeletal Metastasis Register in 1999. The Register is a quality-control database which prospectively collects individual-based information on patients operated for skeletal metastases in the long bones and pelvis. Data on patient identity, age, sex, primary tumor, location of metastases, type of pathological fracture, and perioperative treatment were gathered. Information concerning surgical procedures such as method of fixation, type of implant, and postoperative complications are registered. Moreover, some clinical data such as pain levels (no, light, moderate, strong, or severe pain), pain medication use, mobility, and the Karnofsky performance score are recorded.