Pustulotic arthro-osteitis is a special form of arthropathy associated with the dermal disease pustulosis palmoplantaris. It is generally characterised by more osseous involvement than seen in other forms of SpA. It often involves the anterior chest wall as well as the spine, and changes in other joint regions are rare.
Pustulotic arthro-osteitis is sometimes described under the term SAPHO (syndroma acne pustulosis hyperostosis), which encompasses a mixture of various diseases with a tendency to manifest themselves with enlarged bone or joint regions (hyperostosis).