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Psoriatic arthritis
Psoriatic arthritis (PsA) is a long-term inflammatory arthritis that may occur in some people affected by the autoimmune disease psoriasis. The classic features of psoriatic arthritis include dactylitis (sausage-like swelling of the fingers), skin lesions, and nail lesions. Lesions of the nails may include small depressions in the nail (pitting), thickening of the nails, and detachment of the nail from the nailbed. Skin lesions consistent with psoriasis (e.g., red, scaly, and itchy plaques) frequently occur before the onset of psoriatic arthritis but psoriatic arthritis can precede the rash in 15% of affected individuals. It is classified as a type of seronegative spondyloarthropathy.
Genetics are thought to be strongly involved in the development of psoriatic arthritis. Obesity and certain forms of psoriasis are thought to increase the risk.
Psoriatic arthritis affects up to 30% of people with psoriasis. It occurs in both children and adults. Some people with PsA never get psoriasis.
The condition is less common in people of Asian or African descent. It affects men and women equally.
The signs and symptoms of psoriatic arthritis are very variable from one individual to the next. Symptoms usually appear after age 30.
The majority of patients with PsA experience peripheral joint involvement. Pain, swelling, or stiffness in one or more joints is commonly present in psoriatic arthritis. Psoriatic arthritis is inflammatory, and affected joints are generally red or warm to the touch. Asymmetrical oligoarthritis, defined as inflammation affecting two to four joints during the first six months of disease, is present in 70% of cases. However, in 15% of cases, the arthritis is symmetrical.
The joints of the hand that are involved in psoriasis are the proximal interphalangeal, the distal interphalangeal, the metacarpophalangeal joint, and the wrist. Involvement of the distal interphalangeal joints is a characteristic feature in many cases.
Sausage-like swelling in the fingers or toes, known as dactylitis, occurs in about 40% of PsA cases.
Psoriatic arthritis
Psoriatic arthritis (PsA) is a long-term inflammatory arthritis that may occur in some people affected by the autoimmune disease psoriasis. The classic features of psoriatic arthritis include dactylitis (sausage-like swelling of the fingers), skin lesions, and nail lesions. Lesions of the nails may include small depressions in the nail (pitting), thickening of the nails, and detachment of the nail from the nailbed. Skin lesions consistent with psoriasis (e.g., red, scaly, and itchy plaques) frequently occur before the onset of psoriatic arthritis but psoriatic arthritis can precede the rash in 15% of affected individuals. It is classified as a type of seronegative spondyloarthropathy.
Genetics are thought to be strongly involved in the development of psoriatic arthritis. Obesity and certain forms of psoriasis are thought to increase the risk.
Psoriatic arthritis affects up to 30% of people with psoriasis. It occurs in both children and adults. Some people with PsA never get psoriasis.
The condition is less common in people of Asian or African descent. It affects men and women equally.
The signs and symptoms of psoriatic arthritis are very variable from one individual to the next. Symptoms usually appear after age 30.
The majority of patients with PsA experience peripheral joint involvement. Pain, swelling, or stiffness in one or more joints is commonly present in psoriatic arthritis. Psoriatic arthritis is inflammatory, and affected joints are generally red or warm to the touch. Asymmetrical oligoarthritis, defined as inflammation affecting two to four joints during the first six months of disease, is present in 70% of cases. However, in 15% of cases, the arthritis is symmetrical.
The joints of the hand that are involved in psoriasis are the proximal interphalangeal, the distal interphalangeal, the metacarpophalangeal joint, and the wrist. Involvement of the distal interphalangeal joints is a characteristic feature in many cases.
Sausage-like swelling in the fingers or toes, known as dactylitis, occurs in about 40% of PsA cases.
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