CPPD & pseudogout

CPPD happens when tiny crystals of calcium pyrophosphate build up in the cartilage and soft tissues of a joint. When some of these crystals shed into the joint lining they trigger sudden inflammation, the painful flare often called pseudogout. The same deposits can also quietly damage cartilage over time, giving a more grumbling, osteoarthritis-like picture.

In most people no single cause is found, and it becomes more common with age. Sometimes it runs in families or follows joint injury or surgery. Occasionally it is linked to an underlying metabolic condition, such as an overactive parathyroid gland, low magnesium or excess iron, which is why a specialist may check a few blood tests when CPPD appears unusually early or widely.

CPPD can show itself in different ways. Common features include:

• Sudden episodes of a hot, swollen, painful joint, often a knee or wrist
• Attacks that can resemble gout but tend to affect different joints
• Sometimes a more persistent, low-grade joint pain over time

Rarely, an infected joint (septic arthritis) can closely resemble a pseudogout flare. If you have a fever, feel increasingly unwell or the joint is rapidly worsening, seek same-day urgent care, for example via NHS 111 or your nearest emergency department, rather than waiting for a routine appointment.

Diagnosis is based on the pattern of symptoms, clinical examination and, where needed, analysis of fluid drawn from the joint, supported by imaging. Telling CPPD apart from gout and other causes of a hot, swollen joint is important, because the long-term management differs.

Ultrasound is particularly helpful here, as it can show the characteristic appearance of calcium crystals in the joint, helping distinguish CPPD from gout. Dr Borukhson uses point-of-care ultrasound during the consultation, so this can often be assessed in the same visit. You can read more on the ultrasound clinic page.

Treatment focuses on settling an acute attack with anti-inflammatory measures and, where attacks are recurrent, on reducing their frequency. Where a single joint is severely inflamed, an ultrasound-guided injection may help bring it under control. The plan is tailored to your situation and agreed with you.

Between attacks, keeping the affected joints moving and the surrounding muscles strong helps protect them, and staying active within comfortable limits is better than long-term rest. Reaching and holding a healthy weight eases load on the knees in particular.

It helps to learn your own early warning signs of a flare, so you can rest the joint and start simple measures promptly. Unlike gout, there is no specific diet that prevents CPPD, so you do not need to avoid particular foods.

The outlook is generally good. Most attacks settle and many people have long gaps between them. Where flares recur or joints stay sore, that is worth reviewing rather than enduring, as steps can often reduce how often they happen.

Seek same-day, urgent care if a hot, swollen joint comes with a fever, shaking chills or feeling increasingly unwell, or if the joint is worsening rapidly. A joint infection can closely mimic a pseudogout flare and needs to be ruled out quickly, for example through NHS 111 or your nearest emergency department.

Also seek prompt advice if a flare is unusually severe, fails to settle over a week or two, or affects several joints at once with a general feeling of being run down.

Arrange a routine review, rather than urgent care, for recurrent hot, swollen joints between episodes, or for a joint that stays persistently painful or stiff. These warrant assessment to confirm the cause and agree a plan, but are not emergencies.

Because CPPD is so easily mistaken for gout, confirming which crystal is responsible ensures the right long-term approach. If you have had episodes of a hot, swollen joint, a specialist assessment, with ultrasound where helpful, can establish the cause.

How is CPPD diagnosed?

Diagnosis starts with your symptoms, an examination and the pattern of joints involved. Where needed, fluid is drawn from the joint and examined to identify the crystal, which gives the clearest answer. Imaging helps too: an X-ray can show calcium within the cartilage, and ultrasound can reveal the same calcium deposition. Dr Borukhson uses point-of-care ultrasound during the consultation, so this can often be assessed in the same visit.

How is a pseudogout attack treated, and how long does it take to settle?

Treatment focuses on calming the inflammation, usually with anti-inflammatory measures and rest for the joint. Where a single joint is severely affected, an ultrasound-guided injection can help bring it under control quickly. Many attacks ease over days to a couple of weeks. If episodes keep recurring, the plan shifts towards reducing how often they happen. The right approach depends on your situation and is always agreed with you.

Can I do anything myself during a flare?

During an attack it helps to rest the affected joint and avoid overloading it, while keeping gentle movement once the worst settles. Simple pain relief and, for some people, an ice pack over the joint can ease discomfort. These measures support medical treatment rather than replace it. If a hot, swollen joint is not improving, or attacks are becoming frequent, it is sensible to have it assessed rather than manage it alone.

How is CPPD different from gout, and why does the difference matter?

Both are crystal arthritis and can cause sudden, painful, swollen joints, so they are easily confused. The crystal differs, calcium pyrophosphate in CPPD and urate in gout, and CPPD tends to favour larger joints such as the knee or wrist. The distinction matters because the long-term management is not the same, so confirming which crystal is responsible ensures you are offered the right approach rather than treatment aimed at the wrong condition.

When should I seek urgent help, and do I need to see a specialist?

An infected joint can closely mimic a pseudogout flare, so if you develop a fever, feel increasingly unwell, or the joint is rapidly worsening, seek same-day urgent care, for example through NHS 111 or your nearest emergency department. For recurrent hot, swollen joints that are not urgent, a specialist review is worthwhile to confirm the cause and agree a plan, with ultrasound where helpful.