open carpal tunnel surgery

All EDX were performed using the Medtronic Key-Point EMG device (Denmark) by a neurology expert. Sensory and motor conduction studies of the median nerve and sensory conduction studies of the ulnar nerve were performed using standard techniques of supramaximal stimulation. Stimulation intensity was increased (3 mA for sensory or motor studies) each time until supramaximal stimulation was reached and maximal action potential was achieved. Sensory nerve conduction studies were performed with an antidromic method. Median nerve sensory nerve conduction velocity (SNCV) and sensory nerve action potential (SNAP) amplitude were calculated by recording from thumb and ulnar nerve from the 5th finger. Median nerve compound muscle action potential (CMAP) amplitude and distal motor latency (DML) were recorded from the abductor pollicis brevis Comparing with our clinical neurophysiology laboratory's normal values, the patients with only abnormal SNCVs (small or slow) with normal motor conduction we

In both measurements and injections, the patients were positioned as follows: shoulder in a neutral position, elbow at 90º flexion, forearm supinated, wrist in slight extension, and fingers in semi-flexion. For examination, a linear array probe portable US device (Clarius, L7 HD3 Linear Scanner) was used. Median nerve CSA was measured using the manual trace method in axial view in the proximal carpal tunnel (at the scaphoid-pisiform level), where the median nerve's largest enlargement was found. The mean of cross-sectional area (CSA) was calculated using three consecutive measurements (mm²) and recorded. Flattening ratio (FR) was calculated by dividing the transverse diameter of the nerve by its anteroposterior diameter.