What is Psoriatic Arthritis?

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What is psoriatic arthritis?

Psoriatic arthritis is an autoimmune disorder characterized by inflammation of the joints, and occasionally the spine. It typically affects 6–10% of psoriasis patients, although the incidence has been estimated to be higher (around 20–40%) in patients with more extensive skin disease. The majority of patients have psoriasis at the onset of their arthritic symptoms, but some may develop skin disease well after the arthritis has presented. Some patients with psoriatic arthritis may never develop psoriasis, but they may have a family history of psoriasis or psoriatic arthritis.

What are symptoms of psoriatic arthritis? 

Patients with psoriatic arthritis typically present with joint pain, swelling and AM stiffness. Patients may also have inflammatory low back pain, or back pain which improves, rather than worsens, with activity. This is different from mechanical low back pain, which worsens with activity. Enthesopathy, or inflammation at the sites where tendons and ligaments attach to the bone, is another key feature of psoriatic arthritis. Achilles tendonitis and plantar fasciitis are examples of enthesopathy. Dactylitis (“sausage digit”), nail changes, and eye inflammation are also associated with psoriatic arthritis

What are risk factors for developing psoriatic arthritis?

Certain genes have been identified that make individuals more prone to developing disease. Patients with affected family members are at increased risk. Obesity during early adulthood and HIV have also been identified as risk factors. In patients with psoriasis, the severity of psoriasis, the presence of nail pitting and uveitis have been correlated with an increased risk developing psoriatic arthritis.

How is psoriatic arthritis diagnosed?

The diagnosis of psoriatic arthritis is based predominantly on the presence of clinical symptoms, as described above. There are no laboratory tests that are diagnostic of psoriatic arthritis. Patients with psoriatic arthritis typically test negative for rheumatoid arthritis and other autoimmune disorders. However, certain non-specific laboratory abnormalities, such as elevated inflammatory markers (ESR, CRP), may be present. Joint aspiration and joint fluid analysis may be helpful in establishing the presence of joint inflammation, and ruling out other causes of inflammatory arthritis (ie. crystalline disease such as gout or pseudogout). The presence of specific x-ray abnormalities may be helpful in making a diagnosis. MRIs, which are more sensitive than x-rays, can be used to image an area of concern if x-rays are normal, but there is still a high level of suspicion for an underlying problem.

How is psoriatic arthritis treated?

Mild arthritis symptoms can be managed with non-steroidal anti-inflammatories (NSAIDs) or local steroid injections into the affected joints. Moderate symptoms are treated with traditional disease-modifying anti-rheumatic drugs (DMARDs), such as sulfasalazine or methotrexate. Otezla (Apremilast) is a newer oral medication that has been approved for treatment of both psoriasis and psoriatic arthritis. Patients with severe disease are often treated with biologic agents, such as anti-tumor necrosis factor inhibitors (anti-TNFs) (Etanercept, Remicade, Humira, Cimzia and Simponi), Stelara or Cosentyx.

Are there any useful lifestyle modifications that I can make?

Yes! Several lifestyle modifications have been shown to be beneficial in psoriatic arthritis patients, including weight loss, routine exercise, and avoidance of smoking and excessive ETOH consumption. 


Dr. Dee Dee Wu is a rheumatologist who specializes in the treatment of rheumatoid arthritis, psoriatic arthritis, osteoarthritis and osteoporosis. She practices at both the HSS Outpatient Center in Paramus and the hospital’s main campus in New York.

The information provided in this blog by HSS and our affiliated physicians is for general informational and educational purposes, and should not be considered medical advice for any individual problem you may have. This information is not a substitute for the professional judgment of a qualified health care provider who is familiar with the unique facts about your condition and medical history. You should always consult your health care provider prior to starting any new treatment, or terminating or changing any ongoing treatment. Every post on this blog is the opinion of the author and may not reflect the official position of HSS. Please contact us if we can be helpful in answering any questions or to arrange for a visit or consult.


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  1. Hello Dr. Wu,
    I was told that I have rheumatoid and osteoarthritis but my doctor only want to give me moloxocam . It is so had to move around . All my bones hurt. My rheumatologist want refer me to orthopedic. Do you have any suggestions?

    1. Hi Deborah- Rheumatoid arthritis is not just treated with meloxicam- I would advise following through with your treating rheumatologist’s recommendations since I presume they know your condition best. If you are not satisfied with the care, then it would be best to seek another rheumatology opinion.

  2. Hi Doctor, I am 74 years old and suffer with inflammation of the joints in my fingers. The problem is mostly in my left hand. The fingers are curving especially the middle finger of the left hand. I cannot make a fist with my left hand. Most of the knuckles hurt when I try and squeeze them. I am very active and work out at a fitness club on average of 6 times per week. This problem has been going on about 4 to 5 years now and is particularly bad when I wake up in the morning. I had my right knee replaced at HSS, 3 years ago by Dr. Robert Marx and everything is great with my knee. Any suggestions?

    1. “No definite diagnosis can be made without a formal evaluation. You would certainly benefit from a rheumatology evaluation regardless of whether you have psoriatic arthritis, as your physician can direct you in managing non-inflammatory conditions.” – Dr. Dee Dee Wu, Rheumatologist.

      If you would like to consult with a physician at Hospital for Special Surgery (HSS), please contact our Physician Referral Service at 888-720-1982 for further assistance.