Table 2. CSAs, ΔCSAs and ΔUtpt results. Patients were classified according to the Ridley-Jopling classification.
| Group | ||||||||
|---|---|---|---|---|---|---|---|---|
| TT | BT | BB | BL | LL | p-value | |||
| Variable | Nerve | 11 patients | 31 patients | 33 patients | 13 patients | 8 patients | ||
| CSA (mm2) | Ulnar (Upt) | n | 22 | 58 | 66 | 26 | 16 | |
| mean±SD | 7±2.1 | 8.9±8.5 | 9±7 | 11.3±6.1 | 14.9±9.1 | 0.0006* | ||
| 95% CI | [6.1–7.9] | [6.7–11.1] | [7.3–10.8] | [8.8–13.8] | [10.1–19.7] | |||
| abnormal | 3 (13.6%) | 9 (15.5%) | 16 (24.4%) | 13 (50%) | 10 (62.5%) | |||
| Ulnar (Ut) | n | 22 | 60 | 66 | 26 | 16 | ||
| mean±SD | 8.6±5.5 | 12.4±14.9 | 10.8±6.2 | 10.6±4.7 | 15.6±4.6 | <0.0001* | ||
| 95% CI | [6.1–11] | [8.6–16.3] | [9.3–12.3] | [8.7–12.5] | [13.1–18] | |||
| abnormal | 4 (18.2%) | 14 (23.3%) | 24 (36.4%) | 11 (42.3%) | 13 (81.3%) | |||
| Median | n | 20 | 61 | 63 | 26 | 16 | ||
| mean±SD | 6.2±1 | 8±4.5 | 8.4±4.4 | 11.6±6.2 | 12±4.8 | <0.0001* | ||
| 95% CI | [5.7–6.7] | [6.9–9.2] | [7.3–9.5] | [9.1–14.1] | [9.5–14.6] | |||
| abnormal | 0 (0%) | 17 (27.9%) | 18 (28.6%) | 10 (38.5%) | 9 (56.3%) | |||
| Common Fibular | n | 22 | 62 | 64 | 26 | 16 | ||
| mean±SD | 16.8±13.1 | 16.4±9.3 | 16.1±8.6 | 21.1±10.2 | 20.3±7.6 | 0.0049* | ||
| 95% CI | [11–22.6] | [14–18.7] | [14–18.6] | [17–25.2] | [16.3–24.4] | |||
| abnormal | 6 (27.3%) | 19 (30.6%) | 17 (26.6%) | 12 (46.2%) | 9 (56.3%) | |||
| ΔCSA (mm2) | Ulnar (Upt) | n | 11 | 28 | 33 | 13 | 8 | |
| mean±SD | 1.7±1.9 | 5.1±11.2 | 3.2±4.5 | 2.6±3.2 | 7.2±8.7 | 0.5027 | ||
| 95% CI | [0.4–2.9] | [0.7–9.4] | [1.6–4.7] | [0.7–4.5] | [0–14.5] | |||
| abnormal | 3 (27.3%) | 8 (28.6%) | 9 (27.3%) | 4 (30.8%) | 5 (62.5%) | |||
| Ulnar (Ut) | n | 11 | 29 | 33 | 13 | 8 | ||
| mean±SD | 3.4±4.7 | 6.0±17.9 | 4.2±5.9 | 2.8±2.6 | 4.1±2.4 | 0.3665 | ||
| 95% CI | [0.2–6.6] | [0–12.7] | [2.1–6.3] | [1.2–4.4] | [2.1–6.0] | |||
| abnormal | 3 (27.3%) | 8 (27.6%) | 16 (48.5%) | 5 (38.5%) | 6 (75%) | |||
| Median | n | 10 | 30 | 31 | 13 | 8 | ||
| mean±SD | 0.8±0.6 | 1.6±2.5 | 2.4±4.1 | 1.9±2.4 | 1.8±1.9 | 0.7688 | ||
| 95% CI | [0.4–1.2] | [0.7–2.5] | [0.9–3.9] | [0.4–3.3] | [0.2–3.3] | |||
| abnormal | 0 (0%) | 5 (16.7%) | 6 (19.4%) | 1 (7.7%) | 3 (37.5%) | |||
| Common Fibular | n | 11 | 31 | 32 | 13 | 8 | ||
| mean±SD | 7.3±15.6 | 4.5±7.1 | 3.2±3.9 | 7.1±8.8 | 2.2±2.1 | 0.6314 | ||
| 95% CI | [0–17.7] | [1.9–7.2] | [1.8–4.6] | [1.7–12.4] | [0.4–4.0] | |||
| abnormal | 3 (27.3%) | 11 (35.5%) | 11 (34.4%) | 7 (53.9%) | 2 (25%) | |||
| ΔUtpt (mm2) | Ulnar (Ut and Upt) | n | 22 | 57 | 66 | 26 | 16 | |
| mean±SD | 3.4±4.9 | 5.0±8.0 | 3.4±4.1 | 3.9±4.0 | 7.3±6.0 | 0.0238* | ||
| 95% CI | [1.2–5.5] | [2.9–7.1] | [2.4–4.4] | [2.3–5.5] | [4.1–10.5] | |||
| abnormal | 7 (31.8%) | 13 (22.8%) | 16 (24.2%) | 7 (26.9%) | 11 (68.8%) | |||
n: number of nerves; SD: standard deviation; 95% CI: 95% confidence interval; abnormal: number of nerves with abnormal measurements and percentages in parenthesis (values were considered abnormal when they exceeded the mean + 2SD value obtained from healthy volunteers).
p-value by Kruskal-Wallis test.
* Statistically significant.