Table 2B.

The occurrence frequencies of MRI features per joint, comparing selected versus nonselected hand. Values are % unless otherwise specified.

MRI Joint	Unilateral Hand			Misdiagnosis by MRI of Unilateral Selected Hand		Missed Diagnosis by MRI of Unilateral Nonselected Hand
MRI Joint	Selected	Nonselected	p^*	Rate	p^*	Rate	p^*
Synovitis
Wrist^{^†}	93	94	1	5	0.031	4	0.063
MCPJ2	58	60	0.701	12	< 0.001	10	< 0.001
MCPJ3	53	44	0.071	9	< 0.001	18	< 0.001
MCPJ4	63	45	< 0.001	3	0.125	21	< 0.001
MCPJ5	70	63	0.108	7	0.008	14	< 0.001
Osteitis
Wrist^⋄	91	89	0.774	4	0.063	6	0.016
MCPJ2^{^}	40	38	1	13	< 0.001	15	< 0.001
MCPJ3^{^}	35	35	1	13	< 0.001	13	< 0.001
MCPJ4^{^}	36	29	0.185	8	0.002	15	< 0.001
MCPJ5^{^}	44	41	0.585	11	< 0.001	14	< 0.001
Bone erosion
Wrist^⋄	98	98	1	0	1	0	1
MCPJ2^{^}	44	44	1	15	< 0.001	15	< 0.001
MCPJ3^{^}	33	38	0.362	15	< 0.001	10	< 0.001
MCPJ4^{^}	21	22	1	12	< 0.001	11	< 0.001
MCPJ5^{^}	38	31	0.175	11	< 0.001	18	< 0.001

↵* P value was generated from McNemar test for comparing occurrence frequencies of each MRI feature per joint between dominant and nondominant hand, between selected and nonselected hand, and between MRI of bilateral hands and unilateral hand (dominant, nondominant, selected, or nonselected hand) considered as paired groups. P values in bold face are statistically significant.
↵† Distal radioulnar joint, radiocarpal joint, and intercarpal-carpometacarpal joints were evaluated.
↵⋄ 15 wrist bones were evaluated.
↵^ Metacarpal heads (proximal) and phalangeal bases (distal) were evaluated. MRI: magnetic resonance imaging; MCPJ: metacarpophalangeal joints.