Table 1 Demographic details in this study
Variables | Morphologically normal filum | Morphologically abnormal filum | |
|---|---|---|---|
Filum derivation | SDR (n = 91) | SDR (n = 5) | Filum transection (n = 72) |
Age (Mon, median) | 69.8 (59.8, 82.6) | 69.3 (57.1, 104.1) | 54.6 (17.1, 96.0) |
Gender (female) (%) | 22 (24.2%) | 3 (60.0%) | 31 (43.1%) |
Surgical approach (%) | |||
L2/3 | 91 (100%) | 5 (100%) | 12 (16.7%) |
L3/4 | 0 (0%) | 0 (0%) | 25 (34.7%) |
L4/5 | 0 (0%) | 0 (0%) | 35 (48.6%) |
Threshold of motor nerve roots at surgical level (mA, median) | 0.11 (0.07, 0.14) | 0.10 (0.07, 0.11) | 0.13 (0.08, 0.16) |
Threshold of filum (mA, median) | 0.68 (0.33, 1.80) | 4.0 | 4.0**** |
The threshold ratio of filum to motor nerve roots at the same surgical level | 5.4 (2.9, 15.6) | 36.4 (25.6, 51.5) | 32.1**** (25.0, 50.0) |
Reaction to electrical stimulation (%) | |||
Only in anal sphincter | 22 (23.9%) | 0 (0%) | 0 (0%) |
Only in leg muscles | 43 (46.7%) | 0 (0%) | 0 (0%) |
Both anal sphincter and leg muscles | 26 (28.3%) | 0 (0%) | 0 (0%) |