Evaluation of the Wearable Ground Reaction Force Measurement System for the Rehabilitations of the Lower Limb Fractured Patients

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  • 骨折患者のリハビリテーションへの適用を想定したウェアラブルな床反力計の性能評価
  • コッセツ カンジャ ノ リハビリテーション エ ノ テキヨウ オ ソウテイ シタ ウェアラブル ナ ユカ ハンリョクケイ ノ セイノウ ヒョウカ

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Abstract

<p>The objective of this study is to evaluate the estimation accuracy of the wearable ground reaction force measurement system. We assumed to use the device for the rehabilitation of fracture patients. They usually limited the floor reaction force during the rehabilitation, however, there are no proper devices to measure the force. Conventionally patients step a weight scale to remember the force by their sense. Wearable and low price systems might increase the quality of the rehabilitations. Twelve thin and small sensors were attached under the shoe sole and these output data were used as explanatory variables to estimate the ground reaction force. Test subjects were asked to put on the device and walk in two ways;normally and reducing the ground force by using handrails, as during rehabilitation. Measured data of eight healthy test subjects were divided in half to teacher data and test data, including four test subjects respectively. The regression equation was created as the linear combination of the sensor outputs with the coefficients to minimize the root mean square error. Although the previous research using a similar system required the regression equation for each test subject, we used a general equation which is applicable to any subject. As a result, the average error was 2.79 kgf for teacher data and was 3.64 kgf for test data. One test subject included in the test data showed remarkably large error, 8.99 kgf on average, while the average error of the other three test subjects was 3.09 kgf. The result indicated that it might be difficult to remove the individual differences, and some test subjects would cause unignorable estimation error. However, it might be accurate enough relative to the conventional method of limiting the ground reacting force during the rehabilitation of fracture patients. It is our future task to reduce the error and improve the usability by extending the test subjects to discuss when the error increase or applying this system for the clinical trials.</p>

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