According to the Turkish Public Health Institution data, prostate cancer is the 2 nd most common cancer in men. Advanced stage patients may apply with pain in the lower back, hips, or upper thighs. In this case report, a 66 year-old man who has hip pain referred to our rheumatology department with sacroiliitis is presented. Further investigations revealed that hip pain was the result of acetabular fracture due to osteoblastic bone metastases. Significant pain palliation was achieved in the patient who is diagnosed with primer prostate carcinoma after radiation therapy. Keywords: Prostate cancer, acetabulum, radiotherapy

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