Rheumatic manifestations of inflammatory bowel disease

Table 1 Classification of peripheral arthropathy associated with IBD

Type 1 (Pauci-articular)	Type 2 (Polyarticular)
Less than five joints	Five or more joints
Asymmetric involvement	Persistent inflammation for months or even years
Lower limbs more affected	May be erosive
Self limited episodes that last < 10 wk	Affects both large and small joints
Usually concomitant IBD relapse	It can be symmetric or asymmetric
High frequency of other extraintestinal manifestations	Clinical course is independent of IBD activity
	Associated with uveitis

IBD: Inflammatory bowel disease.

Table 2 AS prevalence studies in patients with IBD

Author and referencenumber	n	Origin of patients	Diagnostic criteria	Prevalence (%)
				AS	SpA	Sacroiliitis (Rx or MRI)	Inflammatory low back pain	Articular manifestations
de Vlam et al[53]	103	Referral center	ESSG	10	35	30	30	39
Scarpa et al[13]	79	Referral center	New York	25			18	43
Salvarani et al[17]	160	Open population	ESSG	2 (CD)	18.1			32.5
				5.1 (UC)
Palm et al[58]	654	Open population	ESSG	6 (CD)	22	2	19
				2.6 (UC)
				3.7 Total
Wordsworth et al[60]	42	Referral center	ESSG	25 (CD)		36

Rx: Radiography; MRI: Magnetic resonance image; ESSG: European Spondyloarthropathy Study Group.