Psoriatic arthritis (also arthropathic psoriasis or psoriatic arthropathy) is a type of inflammatory arthritis that often occurs within both males and females over the age of fifty and affects both sexes equally. It affects around 5-7% of people suffering from psoriasis.

There are five main types of psoriatic arthritis which include:

1. Symmetric: This type is most similar to Rheumatoid arthritis.

2. Asymmetric: This type does not occur in the same joints on both sides of the body and usually only involves less than 3 joints.

3. Arthritis mutilans (M07.1): A severe, deforming and destructive arthritis. This condition can progress over months or years causing severe joint damage.

4. Spondylitis (M07.2): This type is characterized by stiffness of the spine or neck, but can also affect the hands and feet, in a similar fashion to symmetric arthritis.

5. Distal interphalangeal predominant (M07.0): This type is characterized by inflammation and stiffness in the joints nearest to the ends of the fingers and toes. Nail changes often occur.

Psoriatic arthritis is a systemic rheumatic disease which may cause inflammation in body tissues away from the joints other than the skin, typically in the eyes, heart, lungs, and kidneys.

Treating psoriatic arthritis usually involves a combination of anti-inflammatory medications and therapeutic exercise. Stronger, more aggressive medications may be needed if progressive inflammation and joint destruction occur. Exercises for arthritis are performed for the sole purpose of strengthening and maintaining or improving joint range of motion. These exercises should be prescribed by a qualified healthcare professional and performed on a regular basis for best results.

Other treatments for psoriatic arthritis include the use of vitamin D and medications which may alter the immune system. As the immune system changes and genetics become better defined with this illness, the efficacy of available medical treatments will likely improve.