What is psoriatic arthritis? Psoriatic arthritis is a chronic disease characterized by inflammation of the skin (psoriasis) and joints (arthritis). Psoriasis is a common skin condition affecting 2% of the Caucasian population in the United States. It features patchy, raised, red areas of skin inflammation with scaling. Psoriasis often affects the tips of the elbows and knees, the scalp, the navel, and around the genital areas or anus. Approximately 10% of patients who have psoriasis also develop an associated inflammation of their joints. Patients who have inflammatory arthritis and psoriasis are diagnosed as having psoriatic arthritis. The onset of psoriatic arthritis generally occurs in the fourth and fifth decades of life. Males and females are affected equally. The skin disease (psoriasis) and the joint disease (arthritis) often appear separately. In fact, the skin disease precedes the arthritis in nearly 80% of patients. The arthritis may precede the psoriasis in up to 15% of patients. In some patients, the diagnosis of psoriatic arthritis can be difficult if the arthritis precedes psoriasis by many years. In fact, some patients have had arthritis for over twenty years before psoriasis eventually appears! Conversely, patients can have psoriasis for over 20 years prior to development of arthritis, leading to the ultimate diagnosis of psoriatic arthritis. Psoriatic arthritis is a systemic rheumatic disease that can also cause inflammation in body tissues away from the joints other than the skin, such as in the eyes, heart, lungs, and kidneys. Psoriatic arthritis shares many features with several other arthritic conditions, such as ankylosising spondylitis, reactive arthritis (formerly Reiter's syndrome), and arthritis associated with Crohn's disease and ulcerative colitis. All of these conditions can cause inflammation in the spine and other joints, and the eyes, skin, mouth, and various organs. In view of their similarities and tendency to cause inflammation of the spine, these conditions are collectively referred to as "spondyloarthropathies."  What causes psoriatic arthritis? The cause of psoriatic arthritis is currently unknown. A combination of genetic and immune as well as environmental factors are likely involved. In patients with psoriatic arthritis who have arthritis of the spine, a gene marker named HLA-B27 is frequently, but not always, found. Blood testing is now available to test for the HLA-B27 gene. Several other genes have also been found to be more common in patients with psoriatic arthritis. Certain changes in the immune system may also be important in the development psoriatic arthritis. For example, the decline in the number of immune cells called helper T cells in AIDS patients may play a role in the development and progression of psoriasis in these patients. The importance of infectious agents and other environmental factors in the cause of psoriatic arthritis is being investigated by researchers. What symptoms do patients with psoriatic arthritis feel? In most patients, the psoriasis precedes the arthritis by months to years. The arthritis frequently involve the knees, ankles, and joints in the feet. Usually, only a few joints are inflamed at a time. The inflamed joints become painful, swollen, hot, and red. Sometimes, joint inflammation in the fingers or toes can cause swelling of the entire digit, giving them the appearance of a "sausage." Joint stiffness is common, and is typically worse early in the morning. Less commonly, psoriatic arthritis may involve many joints of the body in a symmetrical fashion, mimicking the pattern seen in rheumatoid arthritis. Psoriatic arthritis can also cause inflammation of the spine (spondylitis) and the sacrum, causing pain and stiffness in the low back, buttocks, neck and upper back. In approximately 50% of those with spondylitis, the genetic marker HLA-B27 can be found. In rare instances, psoriatic arthritis involves the small joints at the ends of the fingers. A very destructive form of arthritis, called "mutilans," can cause rapid damage to the joints. Fortunately, this form of arthritis is rare in patients with psoriatic arthritis. Patients with psoriatic arthritis can also develop inflammation of the tendons (tendinitis) and around cartilage. Inflammation of the tendon behind the heel causes Achilles tendinitis, leading to pain with walking and climbing stairs. Inflammation the of chest wall and of the cartilage that links the ribs to the breastbone (sternum) can cause chest pain, as seen in costochondritis. Aside from arthritis and spondylitis, psoriatic arthritis can cause inflammation in other organs, such as the eyes, lungs, and aorta. Inflammation in the colored portion of the eye (iris) causes iritis, a painful condition that can be aggravated by bright light as the iris opens and closes the opening of the pupil. Corticosteroids injected directly into the eyes are sometimes necessary to decrease inflammation and prevent blindness. Inflammation in and around the lungs (pleuritis) causes chest pain, especially with deep breathing, as well as shortness of breath. Inflammation of the aorta (aortitis) can cause leakage of the aortic valve valves, leading to heart failure and shortness of breath. Acne and nail changes are commonly seen in psoriatic arthritis. Pitting and ridges are seen in finger and toe nails of 80% of patients with psoriatic arthritis. Interestingly, these characteristic nail changes are observed in only a minority of psoriasis patients who do not have arthritis. Acne has been noted to occur in higher frequency in patients with psoriatic arthritis. In fact, a new syndrome has been described, characterized by inflammation of the joint lining (synovitis), acne and pustules on the feet or palms, thickened and inflamed bone (hyperostosis), and bone inflammation (osteitis). This syndrome is therefore given the eponym SAPHO syndrome. How does the doctor diagnose psoriatic arthritis? Psoriatic arthritis is a diagnosis made mainly on clinical grounds, based on a finding of psoriasis and the typical inflammatory arthritis of the spine and/or other joints. There is no laboratory test to diagnose psoriatic arthritis. Blood tests such as sedimentation rate may be elevated and merely reflect presence of inflammation in the joints and other organs of the body. Other blood tests such as rheumatoid factor are obtained to exclude rheumatoid arthritis. When one or two large joints (such a knees) are inflamed, arthrocentesis can be performed. Arthrocentesis is a office procedure whereby a sterile needle is used to withdraw (aspirate) fluid from the inflamed joints. The fluid is then analyzed for infection, gout crystals, and other inflammatory conditions. X-rays may show changes of cartilage or bone injury indicative of arthritis of the spine, sacroiliac joints, and/or joints of the hands. Typical x-ray findings include bony erosions resulting from arthritis. The blood test for the genetic marker HLA-B27, mentioned above, can be found in over 50% of patients with psoriatic arthritis who have spine inflammation. How is psoriatic arthritis treated? The treatment of the arthritis aspects of psoriatic arthritis is discussed below. The treatment of psoriasis and the other involved organs is beyond the scope of this article. Generally, the treatment of arthritis in psoriatic arthritis involves a combination of anti-inflammatory medications (NSAIDs) and exercise. If progressive inflammation and joint destruction occur despite NSAIDs treatment, more potent medications such as methotrexate, corticosteroids, and anti-malarial medications are employed. Exercise programs can be done at home or with a physical therapist and are customized according to the disease and physical capabilities of each patient. Warm-up stretching, or other techniques, such as hot shower or heat applications are helpful to relax muscles prior to exercise. Ice application after the routine can help minimize post-exercise soreness and inflammation. In general, exercises for arthritis are performed for the purpose of strengthening and maintaining or improving joint range of motion. They should be done on a regular basis for best results. Nonsteroidal anti-inflammatory drugs (NSAIDs) are a group of medications that are helpful in reducing joint inflammation, pain, and stiffness. Examples of NSAIDs include aspirin, indomethacin (Indocin), tolmetin sodium (Tolectin), sulindac (Clinoril), and diclofenac (Voltaren). Their most frequent side effects include stomach upset and ulceration. They can also cause gastrointestinal bleeding. Newer NSAIDs, called Cox-2 inhibitors (such as celecoxib or Celebrex), cause gastrointestinal problems less frequently. Disease-Modifying Medicines Patients who experience progressive joint destruction in spite of NSAIDs are candidates for more aggressive disease-modifying medications. Disease modifying medications are important to prevent progressive joint destruction and deformity. These medications include methotrexate (Rheumatrex, Trexall), which is used orally or can be given by injection on a weekly basis for psoriatic arthritis as well as for psoriasis alone. It can cause bone marrow suppression, as well as liver damage with long-term use. Regular monitoring of blood counts and liver blood tests should be performed during therapy with methotrexate. Antimalarial medication such as hydroxychloroquine (Plaquenil) is also used for persistent psoriatic arthritis. Its potential side effects include injury to the retina of the eye. Regular ophthalmologist examinations are suggested while using this medication. Injectable gold (Solganol), and oral gold auranofin (Ridaura). Gold has potential side effects including bone marrow suppression which can lead to anemia and low white blood counts, and adverse effects on the kidney, causing loss of protein or blood in the urine. Sulfasalazine (Azulfidine) is an oral sulfa-related medicine that has also been helpful in some patients with persistent psoriatic arthritis. Traditionally, Azulfidine has been an important agent in the treatment of ulcerative and Crohn's colitis. It should be taken with food, as it too can cause gastrointestinal upset. At recent national meetings of the American College of Rheumatology, research was reported to demonstrate effective treatment of both psoriasis and psoriatic arthritis with leflunomide (Arava)-a medication that was approved in 1998 for the treatment of rheumatoid arthritis. Further studies were suggested to confirm the extent of the effectiveness of this possible new treatment. The TNF-blockers etanercept (Enbrel), infliximab (Remicade), adalimumab (Humira) can be very effective for severe psoriatic arthritis and they can significantly improve or eradicate both the psoriasis and the arthritis as well as stop progressive joint damage. Corticosteroids are potent anti-inflammatory agents. Corticosteroids can be given by mouth (such as prednisone) or injected (cortisone) directly into the joints to reduce inflammation. They can have side effects, especially with long term use. These include thinning of the skin, easy bruising, infections, diabetes, osteoporosis and, rarely, bone death (necrosis) of the hips and knees. While the relationship between the skin disease and joint disease is not clear, there are reports of improvement of the arthritis simultaneously with clearing of the psoriasis. Patients with psoriasis can benefit by direct sunlight exposure and are often treated with direct ultraviolet light therapy. Finally, patients who have severe destruction of the joints may be candidates for orthopedic surgical repair. Total hip joint replacement and total knee joint replacement surgery are now commonplace in community hospitals throughout the United States. What does the future hold for patients with psoriatic arthritis? The future treatment of psoriatic arthritis will evolve as more effective and safe medicines are developed. Recently, it has been shown that vitamin D might actually improve the arthritis of psoriatic arthritis. Other areas of research involve treatment with medications that can alter the immune system of patients with psoriatic arthritis. As the immune system changes and genetics are better defined in this illness, the efficacy of these medical treatments will improve. Psoriatic Arthritis At A Glance
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