Evaluation of Patients Bearing Medial Knee Joint Osteoarthritis by Using Optical Foot Pressure Measuring System

• Main Authors: Bo-Jian Lin, 林伯堅
• Other Authors: Ming-Fa Hsieh
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/50288012013296206553

碩士 === 中原大學 === 生物醫學工程研究所 === 105 === The purpose of this study is to measure plantar dynamic and static parameters, to build a model to predict knee osteoarthritis, and to discuss changes of foot pressure parameters associated with degenerative arthritis. 30 patients with medial knee osteoarthritis were enrolled to the experiment group while 35 non-symptomatic healthy individuals were enrolled to the control group. The present study used the optical foot pressure measurement system to collect the path of the center of foot pressure in the gait cycle, to measure the travel time and offset angle of plantar pressure changes between gait cycle, and to estimate the static pressure of the plantar six districts along with the measurement of other clinical parameters and information. The results show that the mid-stance phase time of the left foot of osteoarthritis patients (0.20 seconds) is significantly longer than that of the control group (0.12 seconds) (p<0.05), and yet the mid-stance phase time of the right foot of osteoarthritis patients (0.19 seconds) is also significantly longer than that of the control group (0.15 seconds) (p<0.05). The individuals in the control (healthy group) prefer early toe-off in terminal stage of gait cycle and the toes used less force to finish the gait cycle. The center of pressure progression of the individuals in the control group is biased toward the big toe, while that of the osteoarthritis group tends to be biased toward the second toe. At the terminal stage of gait cycle, the metatarsal head stress distribution of osteoarthritis group tends to move to big toe, and the individuals in the control group tend to move to fifth toe. The independent-samples t-test compared the means of pressure of six districts regions of plantar area between two groups. It was found that the left foot medial longitudinal arch area, the lateral heel region and the inner heel region of the control group are significant different. The statistics of the modified balance line also showed obvious differences in the left side of the foot, but the right side of the foot was not statistically significant. This finding may be related to pain compensation of standing posture. SPSS was used to reduce three variables of the foot pressure in the six districts regions using the principal component analysis, and then mid-stance phase period, body mass index and center of pressure excursion index variables were included for logistic regression model. The analysis resulted in 90% of the positive predictive logistic regression and a negative predictive value of 88.6% indicating that the static and dynamic plantar pressure variables are statistically different between two groups. Therefore, it is concluded that the optic foot pressure measuring system combined with physical measurements of body height and weight measurements can predict whether the individual is bearing medial knee osteoarthritis or not.