title: Reliability of measuring sciatic and tibial nerve movement with diagnostic ultrasound during a neural mobilisation technique.
abstract: Diagnostic ultrasound provides a technique whereby real-time, in vivo analysis of peripheral nerve movement is possible. This study measured sciatic nerve movement during a "slider" neural mobilisation technique (ankle dorsiflexion/plantar flexion and cervical extension/flexion). Transverse and longitudinal movement was assessed from still ultrasound images and video sequences by using frame-by-frame cross-correlation software. Sciatic nerve movement was recorded in the transverse and longitudinal planes. For transverse movement, at the posterior midthigh (PMT) the mean value of lateral sciatic nerve movement was 3.54 mm (standard error of measurement [SEM] +/- 1.18 mm) compared with anterior-posterior/vertical (AP) movement of 1.61 mm (SEM +/- 0.78 mm). At the popliteal crease (PC) scanning location, lateral movement was 6.62 mm (SEM +/- 1.10 mm) compared with AP movement of 3.26 mm (SEM +/- 0.99 mm). Mean longitudinal sciatic nerve movement at the PMT was 3.47 mm (SEM +/- 0.79 mm; n = 27) compared with the PC of 5.22 mm (SEM +/- 0.05 mm; n = 3). The reliability of ultrasound measurement of transverse sciatic nerve movement was fair to excellent (Intraclass correlation coefficient [ICC] = 0.39-0.76) compared with excellent (ICC = 0.75) for analysis of longitudinal movement. Diagnostic ultrasound presents a reliable, noninvasive, real-time, in vivo method for analysis of sciatic nerve movement.
authors.affiliation: Health and Rehabilitation Research Centre, School of Physiotherapy, AUT University, Auckland, New Zealand. richard.ellis@aut.ac.nz
authors.forename: Richard
authors.initials: R
authors.lastname: Ellis
authors.forename: Wayne
authors.initials: W
authors.lastname: Hing
authors.forename: Andrew
authors.initials: A
authors.lastname: Dilley
authors.forename: Peter
authors.initials: P
authors.lastname: McNair
mesh_terms: D000293:Adolescent; D000328:Adult; D000842:Ankle / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D009068:Movement; D015203:Reproducibility of Results; D012584:Sciatic Nerve / Q000000981:diagnostic imaging*; D013848:Thigh; D013979:Tibial Nerve / Q000000981:diagnostic imaging*; D014463:Ultrasonography; D055815:Young Adult