A survey of the surgical treatment of 31 patients with metastases in the long bones is presented. Early diagnosis is essential to prevent pathological fractures in patients with a malignancy. Localized bone pain and an abnormal isotope bone scan or X-ray are the most reliable clues to diagnosis. Should a pathological fracture occur, reduction and internal fixation are indicated to keep the patient active and reduce pain. This was performed in 29 of the cases reported here. Fixation prior to fracture was carried out in six patients. The advantage of this strategy is that it reduces both operative risks and duration of hospitalization. Furthermore, it creates a more favourable situation with regard to preoperative diagnostic appraisal and choice of approach to improve the mechanical qualities of the bone involved, thus preserving function and activity.