Paget's Disease

(Osteitis Deformans)

Definition

Paget's disease is a bone condition that results in enlarged and deformed bones. It is a long-term condition. Any bone in the body can be affected. However, the most common sites are the spine, skull, pelvis, thighs, and lower legs.
Normal Bone Structure
Bone Matrix
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Causes

Paget's disease is caused by a malfunction in bone formation. Normally, bones are constantly being broken down and rebuilt. With Paget's disease, bones are broken down abnormally fast, and new bone replacement is loose and bulky, instead of strong and compact. These poorly formed bones may become weak. They also may bend over time.The exact cause of this bone malformation is unknown. Paget's disease may be triggered early in life by a viral infection.

Risk Factors

Paget's disease is more common in people of Northern European descent and those who are 55 years of age and older. Other factors that may increase your risk of Paget's disease include:
  • Having a family history, especially in a parent, sibling, or child
  • Smoking

Symptoms

Most people with Paget's disease don't have symptoms. For those with symptoms, Paget's disease may cause:
  • Chronic bone pain, especially legs, hips, or spine
  • Swelling or deformity of a limb
  • Broken bones
  • Bowing of a limb
  • Damaged cartilage in the joints
Paget's disease that involves the skull may cause:
  • Increased head size
  • Headaches
  • Facial pain
  • Hearing loss
Paget's disease doesn't spread to other bones, but the symptoms do get worse over time.

Diagnosis

You will be asked about your symptoms and medical history. A physical exam will be done. Your doctor will order a blood test.Imaging tests take pictures of internal body structures. These are done with:

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