J022033 携帯型ICセンサーを用いた変形性膝関節症患者の3次元歩行計測([J02203]診療技術と臨床バイオメカニクス(3))

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We propose a new gait measurement system using wearable acceleration and gyro sensors, and evaluate the clinical efficacy of this system by measuring gait of knee osteoarthritis (OA) patients, and suggesting new gait parameters. In this system, the subject wears sensor units that included a tri-axis accelerometer, a single axis gyro sensor and two-axis gyro sensor. The sensor data during walking and gravitational acceleration and quatemion rotation method are used to estimate the lower extremity posture and calculate the gait parameters. In this study, 10 knee OA patients and 8 healthy persons were measured during level walking. Not only traditional parameters such as knee flexion angle, gait cycle, stride length, also new parameters that are the angle between right and left knee trajectories(θ_xy) , and the direction of knee acceleration vector at heel contact(θ_acc) were calculated. As the result, this system provided quantitative information on the symptoms of knee OA, such as reducing maximum knee flexion angle and bilateral difference of stride length. O, was significantly different between knee OA group and healthy group (7.4±3.0vs. 1.3±2.1deg,p<0.01), and θ_acc. was significantly different between knee OA group and healthy group (49.0±8.9 vs. 61.0 ±10.5 deg, p<0.05). These differences are appear to be caused by the symptoms of knee OA such as knee joint pain and knee instability. This indicates the possibility that these parameters can be used to evaluate the symptoms of knee OA quantitatively.
2011-09-11

J022033 携帯型ICセンサーを用いた変形性膝関節症患者の3次元歩行計測([J02203]診療技術と臨床バイオメカニクス(3))

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