Table 2

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

rOA Variable

Factor

IP/CMC

MCP

Knee

Spine


L 1st IP

0.512

R 1st IP

0.550

L CMC 1

0.442

R CMC 1

0.429

L 2nd DIP

0.833

L 3rd DIP

0.840

L 4th DIP

0.814

L 5th DIP

0.786

R 2nd DIP

0.796

R 3rd DIP

0.797

R 4th DIP

0.815

R 5th DIP

0.786

L 2nd PIP

0.682

L 3rd PIP

0.707

L 4th PIP

0.711

L 5th PIP

0.669

R 2nd PIP

0.685

R 3rd PIP

0.694

R 4th PIP

0.749

R 5th PIP

0.636

L 2nd MCP

0.595

L 3rd MCP

0.649

L 4th MCP

0.614

L 5th MCP

0.605

R 2nd MCP

0.551

R 3rd MCP

0.589

R 4th MCP

0.671

R 5th 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.

Nelson et al. Arthritis Research & Therapy 2011 13:R176   doi:10.1186/ar3501

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