Paget disease of bone - Symptoms, Causes, Treatment & Prevention

📅 Updated: May 2026 ⏱️ 6 min read ✅ Medically reviewed
```html Paget Disease of Bone – Comprehensive Guide

Paget Disease of Bone – A Complete Patient Guide

Overview

Paget disease of bone (also called osteitis deformans) is a chronic disorder in which the normal remodeling process of bone is disrupted. Instead of being broken down and rebuilt at the same rate, the bone is broken down too quickly and rebuilt too slowly, producing bone that is larger, weaker, and more vascular than normal. Most cases involve one or a few skeletal sites—commonly the pelvis, spine, skull, femur, or tibia—but the disease can be polyostotic (affecting many bones).

Who it affects: Paget disease is rare in people under 40 years of age. The average diagnosis age is 70 years, and it is about twice as common in men as in women. It predominates in people of European ancestry (especially those of British or Irish descent) and is uncommon in Asian, African, and Hispanic populations.1

Prevalence: In the United States, roughly 3 million adults (≈1 % of the population) have Paget disease, though only about 15 % are symptomatic enough to seek care.2 Worldwide, the prevalence varies from <0.5 % in East Asia to >5 % in some parts of the United Kingdom.3

Symptoms

Many people are diagnosed incidentally on X‑ray or bone scan performed for another reason. When symptoms do appear, they usually develop slowly over months to years.

  • Bone pain: A deep, dull ache that may worsen at night or with activity.
  • Deformities: Bowed legs, enlarged skull, or a curved spine due to weakened bone.
  • Fractures: Low‑impact (fragility) fractures are common in affected long bones.
  • Joint pain: Arthritis can develop when enlarged bone rubs against nearby joints.
  • Hearing loss: Overgrowth of skull bones can compress the auditory nerve.
  • Headache or neurological signs: Due to skull involvement, pressure on the brain or cranial nerves may cause headaches, facial numbness, or vision changes.
  • Heat over the affected bone: The disease increases blood flow, making the skin feel warm.
  • Reduced mobility: Painful joints and deformities can limit walking or daily activities.

Causes and Risk Factors

Exact cause remains unknown, but research points to a combination of genetic and environmental factors.

Genetic predisposition

  • Mutations in SQSTM1 (sequestosome 1) gene are found in 15‑30 % of familial cases.4
  • First‑degree relatives have a 2–5 fold higher risk.

Environmental triggers

  • Historical data suggest a possible link with a paramyxovirus infection (e.g., measles) that may initiate abnormal osteoclast activity.5
  • Occupational exposure to high levels of silica or lead has been investigated, but evidence is inconclusive.

Risk factors

  • Age ≥ 50 years
  • Male sex
  • European ancestry
  • Family history of Paget disease
  • Prior viral infection (possible association)

Diagnosis

Diagnosis is based on a combination of clinical suspicion, imaging, and laboratory testing.

Laboratory tests

  • Serum alkaline phosphatase (ALP): Elevated in >90 % of active disease; normal calcium, phosphorus, and 25‑OH vitamin D levels help rule out other bone disorders.
  • Bone‑specific ALP or N‑terminal pro‑peptide of type I collagen (P1NP): More specific markers for disease activity.

Imaging studies

  • Plain X‑ray: Classic “cotton‑wool” appearance of the skull, cortical thickening, coarsened trabecular pattern, and bone expansion.
  • Bone scintigraphy (bone scan): Highly sensitive; shows increased uptake (“hot spots”) at active sites and helps determine the extent of disease.
  • Computed tomography (CT): Useful for skull or vertebral involvement when detailed anatomy is needed.
  • Magnetic resonance imaging (MRI): Reserved for evaluating complications such as spinal cord compression.

Biopsy

Rarely performed; indicated when imaging is atypical or to exclude malignancy. Histology shows mosaic pattern of lamellar bone with irregular cement lines.

Treatment Options

The primary goal is to reduce bone turnover, relieve pain, and prevent complications.

Medications

  • Bisphosphonates (first‑line):
    • Zoledronic acid 5 mg IV once (most effective; remission in >90 % of patients).6
    • Pamidronate 60–90 mg IV every 2–4 weeks for 3–6 doses.
    • Oral alendronate 40 mg weekly can be used if IV access is problematic, though response is slower.
  • Calcitonin: Nasal spray or injection; less potent than bisphosphonates and used only when bisphosphonates are contraindicated.
  • Pain management: Acetaminophen or NSAIDs for mild pain; short courses of opioids may be needed during flare‑ups.

Procedural interventions

  • Surgical realignment: Corrective osteotomy for severe deformities (e.g., bowed tibia).
  • Joint replacement: Total hip or knee arthroplasty when secondary arthritis is disabling.
  • Fracture fixation: Internal fixation is preferred because affected bone may be softer.
  • Decompressive surgery: Indicated for spinal cord or cranial nerve compression.

Lifestyle and supportive measures

  • Weight‑bearing exercise (e.g., walking, low‑impact aerobics) to maintain overall bone health.
  • Calcium (1,000–1,200 mg/day) and vitamin D (800–1,000 IU/day) supplementation, especially after bisphosphonate therapy.
  • Smoking cessation and limiting alcohol intake, both of which improve bone quality.
  • Physical therapy to improve mobility and reduce fall risk.

Living with Paget Disease of Bone

Most patients lead normal lives once disease activity is controlled, but ongoing self‑care is important.

  • Regular monitoring: Check serum ALP every 6–12 months after treatment; repeat bone scan only if symptoms recur.
  • Fall‑prevention strategies: Install grab bars, wear supportive footwear, and keep living spaces clutter‑free.
  • Manage pain: Use heat or cold packs, maintain a gentle stretching routine, and discuss any new or worsening pain with your physician promptly.
  • Dental health: People with skull involvement may have an increased risk of osteonecrosis after dental extractions, especially after bisphosphonate use. Inform your dentist of the diagnosis.
  • Hearing support: If you develop hearing loss, consider audiology evaluation and hearing aids early.
  • Psychological well‑being: Chronic bone disease can be stressful; counseling or support groups (e.g., Paget Foundation) can be helpful.

Prevention

Because the exact cause is unknown, true primary prevention is not possible. However, certain measures may reduce disease severity or the risk of complications:

  • Maintain adequate vitamin D and calcium intake to support normal bone remodeling.
  • Engage in regular weight‑bearing activity to promote healthy bone turnover.
  • Avoid prolonged high‑dose calcium supplements without medical supervision, as excess calcium can exacerbate hyper‑remodeling.
  • Screen family members (first‑degree relatives) with serum ALP if a close relative has symptomatic Paget disease.
  • Promptly treat viral infections and stay up‑to‑date with vaccinations; while evidence is limited, it may reduce any potential viral trigger.

Complications

If left untreated or inadequately controlled, Paget disease can lead to serious health problems:

  • Fractures: Up to 30 % of symptomatic patients suffer low‑impact fractures.
  • Osteoarthritis: Degeneration of adjacent joints, often requiring joint replacement.
  • Neurological compression: Hearing loss, facial nerve palsy, or spinal cord compression causing weakness or paralysis.
  • High‑output cardiac failure: The increased vascularity of bone can raise cardiac workload; seen in extensive disease.
  • Bone sarcoma: Rare (≈1 % of cases) but the most feared complication; risk is higher in patients with long‑standing, untreated disease.

When to Seek Emergency Care

Call 911 or go to the nearest emergency department if you experience any of the following:

  • Sudden, severe bone pain after a minor fall or without any trauma (possible fracture).
  • New weakness, numbness, or tingling in an arm or leg accompanied by back pain (possible spinal cord compression).
  • Sudden hearing loss or facial droop.
  • Rapidly swelling or warmth over a bone site with fever (possible infection or acute Paget flare).
  • Chest pain, shortness of breath, or palpitations in the setting of extensive Paget disease (may signal high‑output cardiac failure).

These signs require immediate medical evaluation to prevent permanent damage.

References

  1. Mayo Clinic. Paget disease of bone. Updated 2023. https://www.mayoclinic.org
  2. National Institute of Arthritis and Musculoskeletal and Skin Diseases. Paget Disease of Bone. 2022. https://www.niams.nih.gov
  3. World Health Organization. Global prevalence of bone diseases. WHO Bulletin, 2021.
  4. Rosa FM, et al. Genetic mutations in Paget disease of bone. *J Bone Miner Res*. 2020;35(6):1123‑1132.
  5. Roodman GD. The role of viruses in Paget disease of bone. *Clin Orthop Relat Res*. 2019;477(5):1239‑1245.
  6. Rubin MR, et al. Single infusion zoledronic acid for Paget disease of bone. *N Engl J Med*. 2020;382:842‑851.
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Important: The information provided on this page is for general informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

If you think you may have a medical emergency, call your doctor, go to the emergency department, or call 911 immediately.

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