Article Figures & Data
Figures
- Figure 1.
Pre (a) and post (b) contrast agent short-axis images of the third metatarsophalangeal (MTP) joint demonstrating intact capsule and plantar plate (arrows). Precontrast agent short-axis image (c) of the fourth MTP joint of the same patient demonstrating a capsular tear (arrow), which is confirmed in the postcontrast agent T1 short-axis image (d) with extravasation into the soft tissue (arrow).
- Figure 2.
Precontrast agent sagittal and short-axis images (a) and (b) showing absent plantar plate and laterally displaced flexor tendon (arrow). Postcontrast agent T1 sagittal (c) and short-axis (d) images showing extravasation of contrast agent into the soft tissues and flexor tendon sheath (arrow) confirming an absent plantar plate.
Tables
Variables Demographics, mean (SD) Sex (F/M, n) 11/4 Age, yrs 29.4 (9.8) Disease duration, yrs 7.5 (9.0; range 0.2–27) Disease characteristics, mean (SD) Rheumatoid factor-positive, n 11 DAS44 (CRP, mg/l) 2.71 (0.62) DAS44 (ESR, mm/h) 2.83 (0.68) Patient-reported measures, mean (SD) VAS forefoot pain 37.7 (27.2; range 8–95) LFISIF 12.4 (2.5; range 7–16) LFISAP 14.9 (8.7; range 3–30) Forefoot deformity Platto Structural Index Score, mean (SD) 6.0 (4.1) Subluxation 2nd MTP joint, n 8 Subluxation 3rd MTP joint, n 8 Subluxation 4th MTP joint, n 8 Subluxation 5th MTP joint, n 4 Plantar callus 2nd MTP joint, n 6 Plantar callus 3rd MTP joint, n 1 Plantar callus 4th MTP joint, n 0 Plantar callus 5th MTP joint, n 1 Gait measures, mean (SD) Velocity, cm/s 95.4 (29.9) Peak pressure 2nd MTP joint, kPa 730.9 (387.6) Peak pressure 3rd MTP joint, kPa 531.4 (211.8) Peak pressure 4th MTP joint, kPa 248.0 (76.5) Peak pressure 5th MTP joint, kPa 313.1 (281.75) Larsen score, median (IQR) 2nd MTP joint 1 (0–4) 3rd MTP joint 1 (0–4) 4th MTP joint 1 (0–3) 5th MTP joint 2 (0–3) -
DAS: Disease Activity Score; CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; VAS: visual analog scale; LFISIF: Leeds Foot Impact Scale to assess impairment and footwear; LFISAP: LFIS to assess activity and participation; MTP: metatarsophalangeal; kPa: barefoot peak pressure; IQR: interquartile range.
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- Table 2.
Spearman’s correlation coefficients between magnetic resonance arthrography-reported pathology at the lesser metatarsophalangeal joints in patients with rheumatoid arthritis and clinical, biomechanical, and radiographic variables.
Variables rs p n Disease duration 0.728 0.001 15 VAS −0.122 0.332 15 LFISIF score −0.162 0.282 15 LFISAP score −0.002 0.497 15 Platto’s FF Structural Index score 0.535 0.020 15 Gait velocity −0.200 0.237 15 Larsen score 0.818 0.000 15 Callus present 0.523 0.023 15 Subluxation present 0.486 0.033 15 Peak pressure 0.629 0.006 15 -
VAS: visual analog scale; LFISIF: Leeds Foot Impact Scale to assess impairment and footwear; LFISAP: LFIS to assess activity and participation; FF: forefoot.
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- Table 3.
Absence or focal defect of the plantar plate seen on standard magnetic resonance imaging (MRI) compared to contrast agent extravasation on MR arthrography in 28 lesser MTP joints in patients with RA.
MR Arthrography Contrast Agent Extravasation No Contrast Agent Extravasation Total Standard MR Absence or focal defect of plantar plate 14 1 15 Normal plantar plate 4 9 13 Total 18 10 28
