Sterling Andrew C, Cobian Daniel G, Anderson Paul A, Heiderscheit Bryan C
Department Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706-1532, USA.
Spine (Phila Pa 1976). 2008 Aug 1;33(17):1882-8. doi: 10.1097/BRS.0b013e31817e7019.
Descriptive, cross-sectional design of healthy young adults. Continuous motion monitoring of the cervical spine performed outside of a laboratory setting.
The objective of this study was to quantify the daily frequency and magnitude of neck motion in healthy human subjects using continuous motion monitoring.
Daily frequency and magnitudes of neck motion in healthy young adults may be useful for clinicians in appropriate treatment programs for individuals with cervical injury and pathology. In addition, the design of cervical disc prostheses requires such information to estimate annual wear. These data are not currently available and as a result current American Society for Testing and Materials (ASTM) testing standard F2423-05 may not be accurate.
Ten healthy young adults were fitted with a portable device that measured neck kinematics about all 3 primary axes. Participants wore the unit continuously over a 5-day period. Data from each axis were processed to identify motion magnitude and the frequency of motion within 5 degrees increments. Results were extrapolated to yield daily and yearly values of total neck motion, and that attributed to the C5-C6 level for comparison to ASTM standard F2423-05.
Flexion-extension movements were twice as frequent as movements along the other 2 axes. The median motion magnitude was 13 degrees for both flexion-extension and axial rotation and 10 degrees for lateral bending. Estimates of yearly excursion indicate that the average healthy young adult will undergo 335.6 million degrees of flexion-extension, 109.3 million degrees of lateral bending, and 166.9 million degrees of axial rotation. Our findings indicate that while ASTM testing standard F2423-05 appears appropriate for lateral bending and axial rotation, it underestimates the motion experienced in flexion- extension.
Flexion-extension was the primary neck motion during normal daily living, with the majority ofmotions about all axes being less than 15 degrees . ASTM standard F2423-05 may need to be reviewed regarding flexion-extension.
对健康年轻成年人进行描述性横断面设计。在实验室环境之外对颈椎进行连续运动监测。
本研究的目的是通过连续运动监测来量化健康人体受试者颈部运动的每日频率和幅度。
健康年轻成年人颈部运动的每日频率和幅度可能有助于临床医生为颈椎损伤和病变患者制定合适的治疗方案。此外，颈椎间盘假体的设计需要此类信息来估计每年的磨损情况。目前尚无这些数据，因此当前美国材料与试验协会（ASTM）测试标准F2423 - 05可能不准确。
十名健康年轻成年人佩戴了一个便携式设备，该设备可测量颈部在所有三个主要轴向上的运动学数据。参与者在5天内持续佩戴该设备。对每个轴的数据进行处理，以识别运动幅度以及5度增量内的运动频率。结果经外推得出颈部总运动的每日和年度值，以及归因于C5 - C6节段的运动值，以便与ASTM标准F2423 - 05进行比较。
屈伸运动的频率是沿其他两个轴运动频率的两倍。屈伸和轴向旋转的中位运动幅度均为13度，侧弯为10度。年度偏移估计表明，健康年轻成年人平均每年将经历3.356亿度的屈伸运动、1.093亿度的侧弯运动和1.669亿度的轴向旋转运动。我们的研究结果表明，虽然ASTM测试标准F2423 - 05似乎适用于侧弯和轴向旋转，但它低估了屈伸运动中的实际运动情况。
屈伸是正常日常生活中的主要颈部运动，所有轴向上的大多数运动小于15度。关于屈伸运动，可能需要对ASTM标准F2423 - 05进行审查。
