Why are many HIV patients with arthritis categorized as having an undifferentiated SpA?
Many patients with HIV-associated arthritis develop a pattern of oligoarthritis, enthesitis, dactylitis, onycholysis, balanitis, uveitis, or spondylitis without sufficient criteria to be classified as having ReA or psoriatic arthritis. These patients are ultimately given the diagnosis of an undifferentiated SpA.
