Boutwell Erin, Stine Rebecca, Gard Steven
Northwestern University Prosthetics-Orthotics Center Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, 680 North Lake Shore Drive, Suite 1100, Chicago, IL 60611, USA; Department of Biomedical Engineering, McCormick School of Engineering and Applied Science, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA; Jesse Brown VA Medical Center, Department of Veterans Affairs, 820 South Damen Avenue, Chicago, IL 60612, USA.
Northwestern University Prosthetics-Orthotics Center Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, 680 North Lake Shore Drive, Suite 1100, Chicago, IL 60611, USA; Jesse Brown VA Medical Center, Department of Veterans Affairs, 820 South Damen Avenue, Chicago, IL 60612, USA.
Med Eng Phys. 2015 Jan;37(1):151-5. doi: 10.1016/j.medengphy.2014.10.008. Epub 2014 Nov 11.
The lower limbs are subjected to large impact forces on a daily basis during gait, and ambulators rely on various mechanisms to protect the musculoskeletal system from these potentially damaging shocks. However, it is difficult to assess the efficacy of anatomical mechanisms and potential clinical interventions on impact forces because of limitations of the testing environment. The current paper describes a new in vivo measurement device (sudden loading evaluation device, or SLED) designed to address shortcomings of previous loading protocols. To establish the repeatability and validity of this testing device, reliability and human participant data were collected while the stiffnesses of simulated and prosthetic limbs were systematically varied. The peak impact forces delivered by the SLED ranged from 706±3 N to 2157±32 N during reliability testing and from 784±30 N to 938±18 N with the human participant. The relatively low standard deviations indicate good reliability within the impacts delivered by the SLED, while the magnitude of the loads experienced by the human participant (98-117% BW) were comparable to ground reaction forces during level walking. Thus, the SLED may be valuable as a research tool for investigations of lower-limb impact loading events.
在步态过程中，下肢每天都会受到巨大的冲击力，步行者依靠各种机制来保护肌肉骨骼系统免受这些潜在的破坏性冲击。然而，由于测试环境的限制，很难评估解剖学机制和潜在临床干预措施对冲击力的效果。本文描述了一种新的体内测量装置（突然加载评估装置，或SLED），旨在解决先前加载方案的缺点。为了确定该测试装置的可重复性和有效性，在系统改变模拟肢体和假肢的刚度时，收集了可靠性和人体参与者数据。在可靠性测试期间，SLED产生的峰值冲击力在706±3 N至2157±32 N之间，在人体参与者测试中为784±30 N至938±18 N。相对较低的标准差表明SLED产生的冲击具有良好的可靠性，而人体参与者所承受的负荷大小（体重的98-117%）与平地上行走时的地面反作用力相当。因此，SLED作为研究下肢冲击加载事件的研究工具可能具有重要价值。
