Table 2.
Characteristics of study participants.
| Values (n = 143) | |
|---|---|
| Thin-side CTR | 0.399 ± 0.125 |
| Thick-side CTR | 0.446 ± 0.124 |
| Mean of thin- and thick-side CTRs | 0.423 ± 0.123 |
| Low CTR (thin-side), n (%) | 114 (79.7%) |
| Low CTR (thick-side), n (%) | 95 (66.4%) |
| Low CTR (only thin-side), n (%) | 19 (13.2%) |
| Normal CTR (both thin- and thick-sides), n (%) | 29 (20.3%) |
| Joint damage | |
| Wrist joint: none, n (%) | 77 (53.8%) |
| Wrist joint: unilateral, n (%) | 24 (16.7%) |
| Wrist joint: bilateral, n (%) | 42 (29.4%) |
| 2nd MP joint: none, n (%) | 113 (79.0%) |
| 2nd MP joint: unilateral, n (%) | 8 (5.6%) |
| 2nd MP joint: bilateral, n (%) | 22 (15.4%) |
| 3rd MP joint: none, n (%) | 117 (81.8%) |
| 3rd MP joint: unilateral, n (%) | 12 (8.4%) |
| 3rd MP joint: bilateral, n (%) | 14 (9.8) |
| 4th MP joint: none, n (%) | 122 (85.3%) |
| 4th MP joint: unilateral, n (%) | 12 (8.4%) |
| 4th MP joint: bilateral, n (%) | 8 (5.6%) |
Mean ± SD: The mean value is presented with its standard deviation (SD). CTR: cortical thickness rate. In each patient, the side with the lower cortical thickness rate (CTR) of the metacarpals was designated the “thin-side” and that with the higher CTR the “thick-side”. Low CTR (thin-side), n (%): proportion of cases with CTR < 0.50 on the thin-side. Low CTR (thick-side), n (%): proportion of cases with CTR < 0.50 on the thick-side. Low CTR (only thin-side), n (%): proportion of cases with CTR < 0.50 on thin-side only. Normal CTR (both thin- and thick-side), n (%): proportion of cases with CTR > 0.50 on both sides. Wrist joint/2nd–4th MP joint: none, n (%): No lesions detected. Wrist joint/2nd–4th MP joint: unilateral, n (%): Lesions present on one side (right or left). Wrist joint/2nd–4th MP joint: bilateral, n (%): Lesions present on both sides (right and left). MP joint: Metacarpophalangeal joint.