Letts M, Girouard L, Yeadon A
Department of Surgery, Children's Hospital of Eastern Ontario, Ottawa, Canada.
J Pediatr Orthop. 1997 Jan-Feb;17(1):121-4.
Fixation of the halo device in the skulls of young children is sometimes compromised because of a thinner cortex and the increased jarring and trauma that small children experience during their everyday activities of life at that age. To assess the increased fixation that an eight-pin halo fixation would provide over the more standard four-pin fixation, the stiffness of fixation of a halo orthosis was evaluated in four dried human cadaver skulls. Two different fixation systems were used: the first one with four pins in the standard locations and the second with four additional pins. A compressive force was applied to the halo ring at a constant rate of 1.27 mm/min. Load and deflection data were recorded simultaneously until a force of 400 N was reached. Results for the two-pin systems were analyzed and compared statistically by using paired t tests. Statistically significant differences were established between the two sets of results with the 8-pin system providing an increase of 24.2% in the stiffness of fixation.
由于幼儿颅骨皮质较薄，且在那个年龄段的日常活动中会经历更多的震动和创伤，因此在幼儿颅骨上固定头环装置有时会受到影响。为了评估八针头环固定相对于更标准的四针固定所提供的增强固定效果，在四个干燥的人类尸体颅骨上评估了头环矫形器的固定刚度。使用了两种不同的固定系统：第一种在标准位置有四根针，第二种增加了四根针。以1.27毫米/分钟的恒定速率对头环施加压缩力。同时记录载荷和挠度数据，直到达到400牛的力。使用配对t检验对两组针系统的结果进行统计分析和比较。两组结果之间存在统计学上的显著差异，八针系统的固定刚度增加了24.2%。
