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Effect of rotated head posture on dynamic vertebral artery elongation during simulated rear Impact
IVANCIC PC; ITO S; TOMINAGA Y; CARLSON E; RUBIN W; PANJABI MM
CLIN BIOMECH , 2006, vol. 21, n° 3, p. 213-220 Doc n°: 123882 Localisation : Documentation IRR Descripteurs : CC4 - TRAUMATISMES - RACHIS CERVICAL Elongation-induced vertebral artery injury has been hypothesized to occur during non-physiological coupled axial rotation and extension of head. No studies have quantified dynamic vertebral artery elongation during head-turned rear impacts. Therefore, we evaluated effect of rotated head posture vs. Forward head posture at the time of impact on dynamic vertebral artery elongation during simulated rear impacts. Methods. A whole cervical spine model with surrogate head and muscle force replication underwent either simulated head-turned (n = 6) or head-forward (n = 6) rear impacts of 3.5, 5, 6.5 and 8 g. Continuous dynamic vertebral artery elongation was recorded using custom transducer and compared to physiological values obtained during intact flexibility testing. Findings. Average (SD) peak dynamic vertebral artery elongation of up to 30.5 (2.6) mm during head-turned rear-impact significantly exceeded (P < 0.05) the physiological beginning at 5 g. Highest peak elongation of 5.8 (2.1) mm during head-forward rear impact did not exceed physiological limit. Head-turned rear impact caused earlier occurrence of average peak vertebral artery elongation, Langue : ANGLAIS |
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