Calcium Pyrophosphate Deposition Disease (CPPD)

A Type of Arthritis Often Misdiagnosed as Gout

Senior man suffering from knee pain
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Calcium pyrophosphate deposition disease (CPPD) is a type of arthritis. It is caused by deposits of calcium phosphate crystals in the joints and has similar characteristics to gout. A CPPD attack can occur suddenly and cause intense pain, inflammation, and disability.

CPPD is known by other names including pseudogout, an older term still used in many medical practices, and chondrocalcinosis, which specifically refers to the calcium deposits that develop in the joint spaces.

Symptoms

With CPPD, the progressive formation of calcium in the joints can trigger the occasional flare-up of inflammatory arthritis symptoms including pain, stiffness, swelling, fatigue, low-grade fever, and the restriction of movement.

The risk of a CPPD attack tends to increase with age. According to statistics from the American College of Rheumatology, the development of calcium crystals occurs in almost three percent of adults in their 50s. That number increases to nearly 50 percent by the time a person reaches 90.

Not everyone who develops CPPD crystal will experience symptoms. Of the 25 percent who do, most will have painful episodes involving the knees or experience pain and inflammation the ankles, elbows, hands, wrists, or shoulders. CPPD attacks can last from a few days to several weeks.

CPPD attacks may be triggered by a severe illness, surgery, trauma, or extreme overexertion. Over the course of years, the disease can cause the progressive deterioration of joints, resulting in long-term disability. Around five percent of sufferers will develop a chronic rheumatoid arthritis-like condition involving peripheral joints (meaning the same joints on different sides of the body, such as the wrists or knees).

Diagnosis

The diagnosis of CPPD is often a delayed because the symptoms are commonly mistaken for other types of arthritis including osteoarthritis, rheumatoid arthritis, and gout (a disease characterized by the formation of uric acid crystals).

The diagnosis will usually involve the aspiration of fluid from the affected joint and the analysis of the crystalline deposits in the lab.

The doctor may also order imaging tests such as an ultrasound, a ​computed tomography (CT) scan, or a magnetic resonance imaging (MRI) scan to help identify calcified masses around the joint.

Treatment

Unlike gout, in which the uric acid crystals can be dissolved with medications, the crystals involve CPPD are insoluble (meaning they are unable to be dissolved).

Treatment, therefore, is focused on the alleviation of symptoms and the avoidance of future attacks. Pharmaceutical options include:

Surgery may be considered to remove a calcified mass from a joint, although it is still considered experimental with limited data to support its use.

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Article Sources
  • American College of Rheumatology. "Calcium Pyrophosphate Deposition (CPPD)." Atlanta, Georgia; updated March 2017.
  • Schlee, S.; Bollheimer, L.; Bersch, T. et al. "Crystal Arthritides: Gout and Calcium Pyrophosphate Arthritis/Part 1: Epidemiology and Pathophysiology." Z Gerontol Geriatr. 2017. DOI: 10.1007/s00391-017-1197-3.