Prevalence of erosions | Distribution of erosions | |||||||
CR | US | CR | US | |||||
Value | % | Value | % | Value | % | Value | % | |
Wrist | 3/240 | 1.25 | 4/210 | 1.90 | 3/63 | 4.76 | 4/34 | 11.76 |
McP1 | 4/240 | 1.67 | 2/138 | 1.45 | 4/63 | 6.35 | 2/34 | 5.88 |
McP2 | 1/240 | 0.42 | 7/210 | 3.33 | 1/63 | 1.59 | 7/34 | 20.59 |
McP3 | 4/240 | 1.67 | 2/210 | 0.95 | 4/63 | 6.35 | 2/34 | 5.88 |
McP4 | 2/240 | 0.83 | 2/138 | 1.45 | 2/63 | 3.17 | 2/34 | 5.88 |
McP5 | 1/240 | 0.42 | 0/138 | 0.00 | 1/63 | 1.59 | 0/34 | 0.00 |
IP1 | 2/240 | 0.83 | 0/138 | 0.00 | 2/63 | 3.17 | 0/34 | 0.00 |
PiP2 | 0/240 | 0.00 | 0/210 | 0.00 | 0/63 | 0.00 | 0/34 | 0.00 |
PiP3 | 4/240 | 1.67 | 1/210 | 0.48 | 4/63 | 6.35 | 1/34 | 2.94 |
PiP4 | 2/240 | 0.83 | 0/138 | 0.00 | 2/63 | 3.17 | 0/34 | 0.00 |
PiP5 | 2/240 | 0.83 | 0/138 | 0.00 | 2/63 | 3.17 | 0/34 | 0.00 |
DiP2 | 6/240 | 2.50 | 0/138 | 0.00 | 6/63 | 9.52 | 0/34 | 0.00 |
DiP3 | 5/240 | 2.08 | 0/138 | 0.00 | 5/63 | 7.94 | 0/34 | 0.00 |
DiP4 | 4/240 | 1.67 | 0/138 | 0.00 | 4/63 | 6.35 | 0/34 | 0.00 |
DiP5 | 1/240 | 0.42 | 0/138 | 0.00 | 1/63 | 1.59 | 0/34 | 0.00 |
MtP1 | 2/211 | 0.95 | NA | NA | 2/63 | 3.17 | NA | NA |
MtP2 | 2/211 | 0.95 | 0/210 | 0.00 | 2/63 | 3.17 | 0/34 | 0.00 |
MtP3 | 3/211 | 1.42 | 0/210 | 0.00 | 3/63 | 4.76 | 0/34 | 0.00 |
MtP4 | 4/211 | 1.90 | 1/210 | 0.48 | 4/63 | 6.35 | 1/34 | 2.94 |
MtP5 | 11/211 | 5.21 | 15/210 | 7.14 | 11/63 | 17.46 | 15/34 | 44.12 |
Total | 63/4655 | 1.35 | 34/3270 | 1.04 | 63/63 | 100.00 | 34/34 | 100.00 |
Table 3 shows the analysis of erosions performed at the joint level including 4655 joints on CR and 3270 on US. The distribution of erosions refers to the number of bone erosions related to the total number of bone erosions in the whole study population.
CR, conventional radiography; DiP, distal interphalangeal; IP, interphalangeal; McP, metacarpophalangeal; MtP, metatarsophalangeal; NA, not available; PiP, proximal interphalangeal; US, ultrasound.