Calcium Pyrophosphate Disease (CPPD or Pseudogout)

Introduction

Calcium Pyrophosphate Disease (CPPD) is a condition where tiny crystals of calcium pyrophosphate build up in a joint. These crystals can cause irritation, swelling, and pain. The knee is the most commonly affected joint, but CPPD can also occur in the wrist, shoulder, hip, or ankle. Sometimes, CPPD causes sudden, painful flares that resemble gout—this is why it is often called pseudogout. Other times, it can create ongoing arthritis symptoms such as joint stiffness and pain that looks similar to osteoarthritis. The exact cause of CPPD is not always clear, but it is more common in older adults and may be linked to aging, joint injury, or certain medical conditions.

Symptoms of Calcium Pyrophosphate Disease (Pseudogout)

Calcium Pyrophosphate Disease can cause a wide range of symptoms. In some people, the condition may remain silent and cause no problems. In others, CPPD can trigger sudden, intense joint pain with swelling, redness, and warmth—very much like a gout attack. These episodes may last days to weeks. In a more chronic form, CPPD may cause persistent stiffness, swelling, and aching, leading to long-term joint damage. Over time, the buildup of crystals can irritate the cartilage and surrounding tissues, creating arthritis-like changes in the joint.

How Calcium Pyrophosphate Disease is Diagnosed

To diagnose pseudogout (CPPD), a doctor will ask about the patient’s symptoms, such as when the pain started, whether it comes and goes, and which joints are affected. During the physical exam, they will look for swelling, redness, warmth, and reduced motion in the affected joint(s). The most important test is joint aspiration, where fluid is removed from the joint with a needle and then examined under a microscope to look for calcium pyrophosphate crystals. X-rays can also help, as they sometimes show the crystals inside the cartilage, a finding called chondrocalcinosis. Blood tests may be used to help rule out other causes of joint pain.

Treatment of Pseudogout (CPPD)

There is no cure for pseudogout (CPPD), but treatments can help control pain and swelling. Nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen, are often prescribed to reduce pain and inflammation. Corticosteroid injections into the joint can help calm severe flare-ups. Colchicine, a medication commonly used to treat gout, can also help reduce the frequency of CPPD attacks. For people with the chronic form of the disease, physical therapy may improve joint function and flexibility. Lifestyle measures, such as maintaining a healthy weight and staying active with low-impact exercise, can also make symptoms easier to manage.

When Surgery is Needed to Treat Pseudogout

Surgery is rarely needed for CPPD but may be considered if a joint is severely damaged or if other treatments no longer provide relief. Surgical options include removing loose pieces of cartilage or replacing the joint with an artificial one, such as a knee or hip replacement. These procedures are usually reserved for people with advanced joint damage and persistent pain.

Prognosis and Long-Term Outlook

The long-term outlook for CPPD varies. Many people only experience occasional painful episodes, while others develop ongoing arthritis-like problems. With proper treatment, most patients can manage their symptoms and maintain good function. However, repeated inflammation can sometimes lead to permanent joint damage or deformity. Early diagnosis and consistent management are important to reduce pain, protect joint health, and maintain quality of life.

Edited by Stephen Pinney MD, September 13th 2025.