Paget's Disease of Bone

What is Paget's disease of bone?

From: MedlinePlus, National Library of Medicine

Paget's disease of bone is a chronic bone disorder. Normally, there is a process in which your bones break down and then regrow. In Paget's disease, this process is abnormal. There is excessive breakdown and regrowth of bone. Because the bones regrow too quickly, they are bigger and softer than normal. They may be misshapen and easily fractured (broken). Paget's usually affects just one or a few bones.

What causes Paget's disease of bone?

From: MedlinePlus, National Library of Medicine

Researchers do not know for sure what causes Paget's disease. Environmental factors may play a role. In some cases, the disease runs in families, and several genes have been linked to the disease.

Who is at risk for Paget's disease of bone?

From: MedlinePlus, National Library of Medicine

The disease is more common in older people and those of northern European heritage. If you have a close relative who has Paget's, you are much more likely to have it.

What are the symptoms of Paget's disease of bone?

From: MedlinePlus, National Library of Medicine

Many people do not know that they have Paget's, because it often has no symptoms. When there are symptoms, they are similar to those of arthritis and other disorders. The symptoms include:

• Pain, which may be due to the disease or to arthritis, which can be a complication of Paget's
• Headaches and hearing loss, which can happen when Paget's disease affects the skull
• Pressure on the nerves, which can happen when Paget's disease affects the skull or spine
• Increased head size, bowing of a limb, or curvature of the spine. This can happen in advanced cases.
• Hip pain, if Paget's disease affects the pelvis or thighbone
• Damage to the cartilage of your joints, which may lead to arthritis

Usually, Paget's disease gets worse slowly over time. It does not spread to normal bones.

What other problems can Paget's disease of bone cause?

From: MedlinePlus, National Library of Medicine

Paget's disease can lead to other complications, such as:

• Arthritis, because the misshapen bones can cause increased pressure and more wear and tear on the joints
• Heart failure. In severe Paget's disease, the heart has to work harder to pump blood to affected bones. Heart failure is more likely if you also have hardening of the arteries.
• Kidney stones, which can happen when the excessive breakdown of the bone leads to extra calcium in the body
• Nervous system problems, since the bones can cause pressure on the brain, spinal cord, or nerves. There may also be reduced blood flow to the brain and spinal cord.
• Osteosarcoma, cancer of the bone
• Loose teeth, if Paget's disease affects the facial bones
• Vision loss, if Paget's disease in the skull affects the nerves. This is rare.

How is Paget's disease of bone diagnosed?

From: MedlinePlus, National Library of Medicine

Your health care provider may use many tools to make a diagnosis:

• A medical history, which includes asking about your symptoms
• A physical exam
• An x-ray of the affected bones. Paget's disease is almost always diagnosed using x-rays.
• An alkaline phosphatase blood test
• A bone scan

Sometimes the disease is found by accident when one of these tests is done for another reason.

What are the treatments for Paget's disease of bone?

From: MedlinePlus, National Library of Medicine

To avoid complications, it is important to find and treat Paget's disease early. The treatments include:

• Medicines. There are several different medicines to treat Paget's disease. The most common type is bisphosphonates. They help reduce bone pain and stop or slow down the progress of the disease.
• Surgery is sometimes needed for certain complications of the disease. There are surgeries to Allow fractures (broken bones) to heal in a better position Replace joints such as the knee and hip when there is severe arthritis Realign a deformed bone to reduce the pain in weight-bearing joints, especially the knees Reduce pressure on a nerve, if enlargement of the skull or spine injuries effects the nervous system

Diet and exercise do not treat Paget's, but they can help to keep your skeleton healthy. If you do not have kidney stones, you should make sure to get enough calcium and vitamin D through your diet and supplements. Besides keeping your skeleton healthy, exercise can prevent weight gain and maintain the mobility of your joints. Talk with your health care provider before you start a new exercise program. You need to make sure that the exercise does not put too much stress on the affected bones.

Genetic causes described in the linked summary

From: MedlinePlus Genetics

A combination of genetic and environmental factors likely play a role in the development of Paget disease of bone. Researchers have identified genetic changes that increase the risk of the disorder. Additional factors, including certain viral infections, may help trigger the disease in people who are at an increased risk. However, this theory remains controversial.

Variants (also called mutations) in several different genes have been associated with Paget disease of bone. Most of these genes are involved in bone remodeling, a normal process in which old bone is broken down and new bone is created. Bones are constantly being remodeled, and the process is carefully controlled to ensure that bones stay strong and healthy.

Variants in the SQSTM1 gene are found in as many as 50 percent of affected individuals with a family history of Paget disease of bone and in as many as 10 percent of affected individuals without a family history. The SQSTM1 gene provides instructions for making a protein that helps regulate bone remodeling. The SQSTM1 gene variants that are associated with Paget disease of bone cause cells to produce a protein that does not function properly. The abnormal protein causes an increase in the breakdown of bone, which disrupts the bone remodeling process. As a result, certain bones are broken down and replaced much faster than usual, which leads to the unusually large and misshapen bones seen in people with Paget disease of bone. It is unclear why these problems with bone remodeling affect some bones but not others.

Some people with Paget disease of bone have variants in the SQSTM1 gene that are acquired during a person’s lifetime and are only present in certain cells (somatic). Affected individuals with somatic variants in the SQSTM1 gene tend to have signs and symptoms that are less severe than those seen in people with inherited variants in the SQSTM1 gene.

Inheritance described in the linked summary

From: MedlinePlus Genetics

In 15 to 30 percent of cases, Paget disease of bone is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder.

In the remaining cases, the inheritance pattern of Paget disease of bone is not always clear. Many affected individuals have no family history of the condition. Studies suggest that close relatives of people with Paget disease of bone are more likely to develop the disease than people without an affected relative.

Which doctor should you see?

The suggested department for discussing Paget's Disease of Bone is Orthopaedics, with a orthopaedic specialist as the relevant type of clinician. General physician / Family Medicine; paediatrician for children. Referral depends on symptoms.

Additional services that may be relevant, depending on the findings, include: Clinical Genetics.

This is an editorial referral starting point. The appropriate clinic depends on the person’s age, symptoms, previous diagnosis and local services. The first clinician can decide whether another specialty or a team is needed; a department label does not confirm the diagnosis.

How to prepare for an assessment

Bring a short timeline of the main symptoms: when they first appeared, whether they are constant or episodic, what seems to change them, and how they affect daily activities. Include previous reports, discharge summaries, current medicines and supplements, allergies, and any relevant family history. A dated record is more useful than trying to match every feature in an online article.

Ask the clinician what is already established and what remains uncertain. If a test is suggested, ask what question it answers, what its limitations are and how the result would change the next step. The information here is not an instruction to arrange every possible test. In children, bring growth, developmental and school information if it is relevant to the concern.

• What explains the change in pain, movement or function?
• Which activities need adjustment while the diagnosis is being clarified?
• What are the roles of rehabilitation, observation and surgery in this situation?

Treatment discussions and follow-up

Where the source describes treatments, these are an overview of possible care, not a prescription for an individual. Ask which option applies to the confirmed diagnosis, what benefit is expected, what adverse effects to watch for and how progress will be assessed. Availability, approvals and local practice can differ from the country described in the source.

Before leaving the appointment, clarify the next review date, who will communicate results, and whom to contact if the situation changes. Discuss difficulties with sleep, work, school, mobility, eating or emotional wellbeing when these are relevant. Practical support may require coordination between the treating clinician and other services.

The collected references do not establish a complete prevention or long-term outlook section for this entry. Missing information should not be interpreted as proof that prevention is impossible or that a particular outcome is inevitable. Ask what is known for the exact subtype, stage and personal circumstances, and which uncertainties remain.

When to seek emergency help

Severe breathing difficulty, collapse, new stroke-like symptoms, a seizure that is prolonged or repeated without recovery, uncontrolled major bleeding, or an immediate risk of self-harm require emergency help. In India, call 112 or reach the nearest emergency department. This is a general, non-exhaustive warning list; it is not a condition-specific triage tool.