The value of MRI examination on bilateral hands including proximal interphalangeal joints for disease assessment in patients with early rheumatoid arthritis: a cross-sectional cohort study

Table 2 Prevalence of MRI findings and missed-diagnosis rate in different joint areas based on putative MRI of dominant or non-dominant hands compared to MRI of bilateral hands in 75 active early RA patients

	MRI of bilateral hands	Putative MRI of dominant hands^☆		Putative MRI of non-dominant hands^☆
	MRI findings^△	MRI findings^△	Missed-diagnosis rate^▲	MRI findings^△	Missed-diagnosis rate^▲
PIPJs
Tenosynovitis	52 (69%)	50 (67%)	2 (3%)	45 (60%)	7 (9%)
Synovitis	65 (87%)	59 (79%)	6 (8%)	58 (77%)	7 (9%)
Osteitis	23 (31%)	18 (24%)	5 (7%)	15 (20%)	8 (11%)
Bone erosion	22 (29%)	17 (23%)	5 (7%)	17 (23%)	5 (7%)
MCPJs
Tenosynovitis	55 (73%)	52 (69%)	3 (4%)	46 (61%)	9 (12%)
Synovitis	64 (85%)	64 (85%)	0	61 (81%)	3 (4%)
Osteitis	46 (61%)	34 (45%)	12 (16%)	39 (52%)	7 (9%)
Bone erosion	50 (67%)	42 (56%)	8 (11%)	33 (44%)	17 (23%)
Wrists
Tenosynovitis	56 (75%)	54 (72%)	2 (3%)	51 (68%)	5 (7%)
Synovitis	72 (96%)	72 (96%)	0	64 (85%)	8 (11%)
Osteitis	59 (79%)	52 (69%)	7 (9%)	52 (69%)	7 (9%)
Bone erosion	74 (99%)	72 (96%)	2 (3%)	74 (99%)	0

MCPJs metacarpophalangeal joints, PIPJs proximal interphalangeal joints
^☆Putative MRI of dominant or non-dominant hands means analyses on dominant or non-dominant hands based on MRI of bilateral hands, rather than performing separate MRI of dominant or non-dominant hands which increases physical and financial burdens of patients
^△n = the number of patients with MRI findings in a certain joint region (e.g., PIPJs, MCPJs or wrists)
^▲n = the number of patients whose diagnosis would be missed if dominant or non-dominant hands were evaluated unilaterally

ISSN: 1478-6362