Using a Mathematical Model to Analyze Low Back Force of Patient with Spina Bifida

• Main Authors: Ching-Hsuan Chen, 陳璟璿
• Other Authors: Chen-Sheng Chen
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/63853519026798079422

碩士 === 國立陽明大學 === 物理治療暨輔助科技學系 === 96 === Spina bifida(SB) is a congenital defect because of defective development at the spinal cord. It affects the sensory and motor function which often results in muscle paresis. Patients with SB usually have more degree of arm swing, trunk sway, pelvic tilt and rotation when they are walking than normal people. The spinal deformity and low back pain are very common and serious problems in patients with SB. Moreover, this abnormal gait may associate with the low back problem. In order to understand how the abnormal gait affects on low back, this study established a mathematical model composed of fifteen segments and fourteen joints. This is used for analyzing the low back force (LBF) of patient with SB and calculating the xcursions of the center of gravity (ECOG). Furthermore, this model also analyzes the LBF and ECOG of the patient with SP walking in different speeds. This study set up the mathematical model and recruited two subjects: the one was normal child, and the other was the child with SB. Motion analysis system and force plate conducted the data to estimate the LBF in L5/S1 and ECOG. After model validation, the normal child in preferred speed and the child with SB in different speeds were compared in term of the LBF and ECOG.This study found that comparing to the normal child and the child with SB in a gait cycle: (1) in medio-lateral (ML) direction, The LBF of the child with SB was three times greater than that of the normal child; (2) in anterior-posterior (AP) direction, The LBF of the normal child demonstrated an oscillation pattern between anterior and posterior, but the LBF of the child with SB only exhibited anterior direction; (3) in vertical direction, the oscillation of LBF of the child with SB was less than that of the normal child; (4) the ECOG of the child with SB is more in ML direction and less in vertical to ground direction than that of the normal child. This study found that the child with SB walks in different speeds in a gait cycle:(1) in ML direction, the LBF of the child with SB had no obvious difference between fast and slow speed; (2) in AP direction, the LBF of child SB in fast speed is a little bit greater than that of slow speed but only existed in anterior forces; (3) in vertical direction, the LBF of the child with SB in fast speed was more than that in slow speed; (4) the ECOG of the child with SB in fast speed is less in ML direction and more in vertical to ground direction than that in slow speed.