Interface Pressure and Gait Analysis in different walking speeds and Prosthetic Feet on the Below-Knee Amputees with a Prosthesis

• Main Authors: Shiuh-Sheng Shi, 石旭生
• Other Authors: You-Li Chou
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/39066241425737383784

碩士 === 國立成功大學 === 醫學工程研究所 === 91 === Abstract Interface stresses are an important consideration in stump and socket for a prosthetic limb to a person with transtibial amputation. At the stance phase of the gait cycle, the prosthetic socket is expected to support and distribute the entire weight of the patient with an amputated limb. If the stresses are too large between stump and socket, it will induce pain, discomfort and breakdown. In severe case, no prosthesis use is possible, and surgical repair of the residual limb is necessary. The objectives of this study are to analysis gait, the maximum force and pressure between stump and socket during different walking speed. Using the motion analysis system investigated kinematics and kinetics of the gait and the Pedar system were used to investigate the maximum force and pressure between stump and socket during different walking speed. There are 15 male subjects with transtibial amputation participated in this research. Subjects were asked to walk in three different speeds (85 steps/min, 95 steps/min, 115 steps/min ). The maximum force, maximum pressure and force-time integrals in head of fibula, patellar ligament, medial condyle of tibia, tibial end and fibular end were measured at the same time. As the walking speed increased, the range of motion and the moment in hip knee and ankle will increased for all kinds of foot except for SACH foot in ankle. With the walking speed increased, the maximum force and pressure in those measured areas were increased significantly in SACH foot but no significant change in multiple axis foot. In slow walk speed, the force-time integrals were no significant difference for all kinds of feet, but in fast walking speed, the integral value of SACH foot was much more than single and multiple axis foot. Walking speed will influence the maximum force and pressure in SACH foot. Multiple axis foot is the most comfortable in various walking speed. The study provided an objective and subjective data for prosthetist or physician’s prescription for amputees.