Arthritis Research & Therapy

Table 2 Factor loadings* for each radiographic variable in the four-factor solution after oblique rotation

From: Quantification of the whole-body burden of radiographic osteoarthritis using factor analysis

rOA Variable	Factor
	IP/CMC	MCP	Knee	Spine
L 1^st IP	0.512
R 1^st IP	0.550
L CMC 1	0.442
R CMC 1	0.429
L 2^nd DIP	0.833
L 3^rd DIP	0.840
L 4^th DIP	0.814
L 5^th DIP	0.786
R 2^nd DIP	0.796
R 3^rd DIP	0.797
R 4^th DIP	0.815
R 5^th DIP	0.786
L 2^nd PIP	0.682
L 3^rd PIP	0.707
L 4^th PIP	0.711
L 5^th PIP	0.669
R 2^nd PIP	0.685
R 3^rd PIP	0.694
R 4^th PIP	0.749
R 5^th PIP	0.636
L 2^nd MCP		0.595
L 3^rd MCP		0.649
L 4^th MCP		0.614
L 5^th MCP		0.605
R 2^nd MCP		0.551
R 3^rd MCP		0.589
R 4^th MCP		0.671
R 5^th MCP		0.602
Right TFJ			0.699
Left TFJ			0.746
Right PFJ avg^†			0.829
Left PFJ avg^†			0.856
L1/2 DN				0.555
L2/3 DN				0.697
L3/4 DN				0.622
L4/5 DN				0.474
L5/S1 DN				0.427
L1/2 OST				0.560
L2/3 OST				0.652
L3/4 OST				0.568
L4/5 OST				0.416
L5/S1 OST				0.384

*Only loadings > 0.2 are shown
^†PFJ presented for simplicity as average osteophytes across four surfaces (lateral femoral, lateral patellar, medial femoral, medial patellar), nearly identical loadings are obtained for individual surface scores.
CMC, carpometacarpal joint; DIP, distal interphalangeal joint; DN, disc narrowing; IP, interphalangeal joint; MCP, metacarpophalangeal joint; OST, osteophytes; PFJ, patellofemoral joint; PIP, proximal interphalangeal joint; rOA, radiographic osteoarthritis; TFJ, tibiofemoral joint.

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ISSN: 1478-6362

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