Fibrous dysplasia is a chronic disorder in which bone expands because of abnormal development of fibrous tissue.

Osteogenesis imperfecta is also known as brittle-bone disease because it is characterized by bones that break easily without a specific cause.

Osteomyelitis is an inflammation or swelling of bone tissue that is usually the result of an infection.

Paget's disease is the most common bone disorder after osteoporosis in people older than 50.

Primary hyperparathyroidism is a metabolic disorder in which the parathyroid glands produce too much hormone, which can result in the loss of bone tissue.

Detailed information on avascular necrosis, including causes, risk factors, symptoms, diagnosis, and treatment