Median Nerve In Carpal Tunnel Research Articles

3369: High resolution ultrasonography of carpal tunnel syndrome: A dynamic evaluation

Objectives: To assess the median nerve in carpal tunnel with motion of the wrists and hands.Methods: Seventy wrists of 50 patients with proved carpal tunnel syndrome were enrolled (group A). The 30 asymptomatic wrists (group B) and 50 wrists of 25 volunteers (group C) were scanned for comparison. Axial high resolution ultrasonography (HRUS) scanning of wrists through the pre-tunnel, proximal tunnel and distal tunnel with wrists in neutral and extension, and fingers in rest and flexion was performed. The shape, cross-sectional area (CSA) and flattening ratio (FR) of median nerve were assessed. The sliding distance of median nerve with motion of wrists and hands were recorded.Results: With wrists in neutral position and fingers in rest, the mean CSA of the median nerve were significantly enlarged in group A. The mean FR of the median nerve at proximal tunnel level was significantly increased in group A. With wrists in extension position and fingers flexion, the mean distance of median nerve sliding was significantly decreased in group A and group B.Conclusions: The HRUS might be useful for the evaluation of carpal tunnel syndrome. The decrease in mobility of the median nerve in the carpal tunnel might be a predisposing factor of carpal tunnel syndrome. Objectives: To assess the median nerve in carpal tunnel with motion of the wrists and hands. Methods: Seventy wrists of 50 patients with proved carpal tunnel syndrome were enrolled (group A). The 30 asymptomatic wrists (group B) and 50 wrists of 25 volunteers (group C) were scanned for comparison. Axial high resolution ultrasonography (HRUS) scanning of wrists through the pre-tunnel, proximal tunnel and distal tunnel with wrists in neutral and extension, and fingers in rest and flexion was performed. The shape, cross-sectional area (CSA) and flattening ratio (FR) of median nerve were assessed. The sliding distance of median nerve with motion of wrists and hands were recorded. Results: With wrists in neutral position and fingers in rest, the mean CSA of the median nerve were significantly enlarged in group A. The mean FR of the median nerve at proximal tunnel level was significantly increased in group A. With wrists in extension position and fingers flexion, the mean distance of median nerve sliding was significantly decreased in group A and group B. Conclusions: The HRUS might be useful for the evaluation of carpal tunnel syndrome. The decrease in mobility of the median nerve in the carpal tunnel might be a predisposing factor of carpal tunnel syndrome.

Reduced movement of median nerve in carpal tunnel during wrist flexion in patients with non-specific arm pain

Magnetic resonance scans on patients with non-specific arm pain (repetitive strain injury) show reduced median-nerve movement in the carpal tunnel, suggesting that this common condition may involve nerve entrapment.

SPMO 8302 High resolution sonography and magnetic resonance imaging in the evaluation of bifid median nerve in carpal tunnel

SPMO 8302 High resolution sonography and magnetic resonance imaging in the evaluation of bifid median nerve in carpal tunnel

Relative preservation of lumbrical versus thenar motor fibres in neurogenic disorders.

At late stages of median nerve entrapment in the carpal tunnel there may be total denervation of the thenar muscles. Surface electrodes over the thenar endplate zone may record an initial and predominantly positive "M" response to supramaximal median nerve stimulation. By a combination of techniques, it has been established that this surface positive response originates from surviving lumbrical muscles innervated by the median nerve. Their relative preservation may be related to their location in the median nerve. Intraoperative investigations have shown that the thenar motor fibres are primarily located in the ventral-lateral part of the median nerve whereas lumbrical motor fibres are in a more dorsal location and hence are probably better protected against the flexor retinaculum. This relative preservation of lumbrical motor fibres has been observed in other peripheral neuropathies and motor neuron disease, but not in median nerve regeneration of the following nerve transection. The importance of the observation lies in the more precise localisation voltage source for "M" response in terminal or near-terminal carpal tunnel median nerve entrapments and avoidance thereby of possible misinterpretation of electrophysiological observations in this most common nerve entrapment syndrome.

Psoriasis and its treatment.

At late stages of median nerve entrapment in the carpal tunnel there may be total denervation of the thenar muscles. Surface electrodes over the thenar endplate zone may record an initial and predominantly positive "M" response to supramaximal median nerve stimulation. By a combination of techniques, it has been established that this surface positive response originates from surviving lumbrical muscles innervated by the median nerve. Their relative preservation may be related to their location in the median nerve. Intraoperative investigations have shown that the thenar motor fibres are primarily located in the ventral-lateral part of the median nerve whereas lumbrical motor fibres are in a more dorsal location and hence are probably better protected against the flexor retinaculum. This relative preservation of lumbrical motor fibres has been observed in other peripheral neuropathies and motor neuron disease, but not in median nerve regeneration of the following nerve transection. The importance of the observation lies in the more precise localisation voltage source for "M" response in terminal or near-terminal carpal tunnel median nerve entrapments and avoidance thereby of possible misinterpretation of electrophysiological observations in this most common nerve entrapment syndrome.

Compression of median nerve in carpal tunnel and its relation to acroparaesthesiae.

Compression of median nerve in carpal tunnel and its relation to acroparaesthesiae.