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What is SAPHO syndrome?
SAPHO syndrome is a chronic disorder that involves the skin, bone, and joints. SAPHO is an acronym for the combination of synovitis, acne, pustulosis, hyperostosis, and osteitis.
Acne is a skin condition featuring tiny areas of inflammation with pus formation at the hair follicles. Acne occurs most commonly on the face and upper back.
Pustulosis is a very inflammatory skin condition resulting in large fluid-filled blister-like areas (pustules), typically on the palms of the hands and/or the soles of the feet. The skin of these areas peels and flakes (exfoliates).
Hyperostosis means abnormal excessive growth of bone. The hyperostosis of the SAPHO syndrome frequently is located at the points of the bone where tendons attach, generally in the chest wall.
Osteitis means inflammation of the bone. Patients with SAPHO syndrome can develop inflammation of the sacroiliac joints (sacroiliitis) as well as inflammation of the spine (spondylitis) which leads to stiffness and pain of the neck and back.
What causes SAPHO syndrome?
The precise cause of SAPHO syndrome is not known. It is felt that the tendency toward developing SAPHO syndrome can be inherited. Genetic predisposition is suggested by the higher prevalence of HLA-B27, an inherited blood marker, in patients with SAPHO syndrome.
Is SAPHO syndrome related to other joint conditions?
Some researchers feel that the SAPHO syndrome is related to the group of arthritis conditions that typically affect the spine, called the spondyloarthropathies. For further information, please read the Ankylosing Spondylitis and Reactive Arthritis articles.
What are the symptoms of SAPHO syndrome?
SAPHO syndrome causes inflammation of joints with pain, stiffness, swelling, warmth, and redness. Joints affected can be spinal or away from the spine (peripheral joints) such as the fingers, wrists, or knees. Acne of the skin and pustules of the palms of the hands and soles of the feet are characteristic.
Diagnosis of SAPHO syndrome
SAPHO syndrome is diagnosed clinically by identifying the characteristic features of the syndrome including synovitis, acne, pustulosis, hyperostosis, and osteitis. The blood test marker antigen HLA-B27, when present, supports the diagnosis.
What is the treatment for SAPHO syndrome?
Treatment of patients with SAPHO syndrome is directed toward the individual symptoms that are present. Generally, treatment involves medications that reduce inflammation in the particular tissues affected. Examples of medications that are used for inflammation include nonsteroidal anti-inflammatory drugs (NSAIDs, such as aspirin, ibuprofen [Advil, Motrin], and naproxen [Aleve]) and cortisone medications (either in the form of topical creams, tablets, or by injection into the involved area).
Topical cold applications can also help reduce inflammation in some tissues. For patients with persisting joint symptoms, both sulfasalazine (Azulfidine) and methotrexate (Rheumatrex, Trexall) have been tried with varying degrees of success. Newer biologic medications, including infliximab (Remicade), have also been used successfully.
What is the prognosis for SAPHO syndrome?
To some degree, the outlook for patients with SAPHO syndrome is not predictable but depends on response to medications. When sulfasalazine or methotrexate quiet the symptoms and signs of inflammation, the outlook is optimal.
Is it possible to prevent SAPHO syndrome?
Because the tendency toward developing SAPHO syndrome is inherited, it is not possible to prevent the disease at this time.
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