Table 1.

Clinical subtypes of PsA identified by Moll and Wright (1973b)

Clinical subtypes	Disease features
Polyarticular RA-like (symmetrical)	Nail lesions; symmetrical pattern of joint involvement
Oligoarticular asymmetrical	<5 joints involved; asymmetrical joint involvement
Distal predominant pattern	Distal interphalangeal joint involvement prevalent
Spondylitis	Spinal involvement is predominant
Arthritis mutilans	Severe joint destruction

Abbreviations: PsA, psoriatic arthritis; RA, rheumatoid arthritis.