Patient supine, sitting or reclining. Elbow extended or slightly flexed, forearm supinated, (palm of the hand facing upward), wrist in a neutral position. Fingers in a neutral, relaxed position, slightly flexed.
Type of recording electrodes: Surface plate electrodes.
At the midpoint of a line drawn from the first metacarpo-phalangeal joint and the insertion of the tendon of m. flexor carpi radialis.
At the distal interphalangeal joint of the thumb
Surface electrodes on a fixed bar.
· Wrist, 80 mm proximal to the recording electrode (measured obliquely, along the course of the nerve)
· Upper arm
· Supraclavicular region
The Martin-Gruber anomaly occurs in many normal subjects. If a Martin-Gruber anomaly is present, special techniques are required to measure the conduction velocity.
Source: Uppsala, Sweden