No one knows what causes the skin condition psoriasis. In addition, no one knows why about 10% of people with psoriasis go on to develop a related type of arthritis—known as psoriatic arthritis.

See Understanding the Different Names and Classifications for Spondyloarthritis (SpA)

However, a new study reveals that the risk for psoriatic arthritis may be affected by having a previous injury to a bone or joint.

See Psoriatic Arthritis Causes

Psoriatic arthritis on elbow on the knee.
Around 10% of people with psoriasis will develop psoriatic arthritis. See Ankylosing Spondylitis and Spinal Ligaments

Researchers examined the data on about 70,000 psoriasis patients over the course of nearly 20 years. They found that the patients who had experienced bone or joint trauma had an about 50% increased risk of developing psoriatic arthritis, compared with those who had no trauma history.1

The study authors clarified that this doesn't mean people with psoriasis shouldn't be active or play sports because of the risk for injury. Especially since more study is needed to confirm the connection.

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Rather, those with psoriasis who have experienced trauma to a bone or joint can be on the lookout for signs of psoriatic arthritis so they can be diagnosed and treated early.

See Psoriatic Arthritis Treatment

Learn more:

Rheumatoid Arthritis Symptoms

Ways to Get Exercise When You Have Arthritis


  1. OP0311 Physical Trauma is Associated with the Onset of Psoriatic Arthritis Among Psoriasis Patients Ann Rheum Dis 2015;74:190-191 doi:10.1136/annrheumdis-2015-eular.3297