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Ultrasound examinations of the sciatic nerve were performed using high-resolution transducers (7.5, 10 to 20 MHz) both in anatomical specimens and in healthy volunteers. The ultrasonographic anatomy (sono-anatomy) of the nerve, its course along the thigh and its echogenicity in comparison with muscles, tendons and adipose tissue were investigated in 10 isolated muscle/nerve preparations. In addition, the influence of the angle of the applied transducer on the various different tissues was evaluated. In the clinical part of the study, the sciatic nerve was identified ultrasonographically in both thighs of 50 sex-matched healthy volunteers aged between 2 and 76 years. The normal sciatic nerve presents as a tubular echogenic structure with parallel linear internal echoes in the longitudinal section, and as a punctiform moderately echoic structure in cross-section, with the perineurium producing bright boundary echoes. Varying the insonating angle of the transducer reduced echogenicity, but to a smaller degree than in muscles and tendons. Unequivocal identified of the sciatic nerve from the level of the gluteal fold to its bifurcation in the distal thigh was possible in all but one case. We conclude that the course of the sciatic nerve along the thigh can be reliably identified and imaged with high-resolution ultrasound.

Die Sonoanatomie des Nervus ischiadicus am Oberschenkel - Ultrasonographic Imaging of the Sciatic Nerve in the Thigh