Hip pain is likely to be due to a local or regional bone disease when the hip joint is painless and of normal mobility by physical examination. Targeting the right diagnosis is easy in a patient affected by bone disease (osteoporosis, Paget's disease) or when the background of the patient is suggestive (malignancy, pregnancy). However it could be more tricky in most cases: transient osteoporosis of the hip, bone fissures, Paget's coxopathy, and tumoral cell osteolysis of bones surrounding the hip are the main causes, in addition to femoral head osteonecrosis, which is detailed in another chapter.