https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5365215/

This is another good overview of recent advances.

Particularly interesting is stuff on unusual entheseal-resident T cell population that are responsive to the gut derived (inflammatory gut)cytokine IL23 - hence inflammation in the gut is the driver of clinical manifestations in the SpA's.

Regards again David
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Dx Oct 2006 B27+ undifferentiated spondlyarthropathy (uSpA) with mild sebhorrhoeic dermatitis and mild Inflammatory Bowel Disease (IBD) controlled by NSD since 2007.