Fig 1.
Schematic drawing of median nerve conduction measurements.
Sensory nerve conduction study (a): stimulation is administered at the distal forearm; sensory nerve conduction velocity (sNCV) and sensory nerve action potential (SNAP) are recorded from the digital nerve of the index finger in antidromic technique. Motor nerve conduction study (b): stimulation is administered at the distal forearm; distal motor latency (dml) and compound muscle action potential (CMAP) are recorded from the APB. Electroneurographic parameters probing axon and myelin sheath integrity are printed in red and green, respectively. APB: abductor pollicis brevis muscle; S: stimulation site; R: recording site.
Table 1.
DTI parameter profiles of the median nerve per reader.
Fig 2.
DTI parameter values of the median nerve at the wrist from proximal to distal.
X-axis denotes the distance from the reference structure (hamulus of the hamate bone) in millimeters. Negative/positive values indicate position proximal/distal to that reference, respectively. Errorbars denote the standard error of the mean. FA: fractional anisotropy; AD: axial diffusivity; MD: mean diffusivity; RD: radial diffusivity.
Table 2.
Correlations between electroneurographic parameters and DTI parameters.
Fig 3.
Scatter plots relating electroneurographic parameters with DTI parameters.
Significant correlations surviving Bonferroni correction for multiple comparisons (see Table 2) are displayed. FA: fractional anisotropy; AD: axial diffusivity; RD: radial diffusivity; CMAP compound muscle action potential; dml: distal motor latency; sNCV: sensory nerve conduction velocity.