Arthro-osteitis--a clinical spectrum.

Arthro-osteitis is an uncommon condition which can be associated with palmoplantar pustulosis. It forms part of a group of conditions which include the synovitis, acne, pustulosis, hyperostosis, osteitis syndrome (SAPHO) and sternocostoclavicular hyperostosis. We report four cases illustrating the clinical spectrum of this condition which occurred in the absence of concomitant skin lesions. One patient had extensive aortic calcification a feature not previously reported in this condition, which may represent a low grade inflammatory aortitis.