握力に関する研究 : 新らしい握力計の考察と握力の解析について
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概要
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The Smedley type hand dynamometer has been long used to quantify the grip power. During the grip motion in our daily living the shape of an object is usually cylindrical. In addition, the conventional hand dynamometer measures the change of distance between two straight bars. From these points of view, the author has been attempted to device the new type hand dynamometer. The first, the grip motion both in the normal hand and in the affected hand using this new instrument were investigated. The second, these results were compared with the grip power measured by the conventional hand dynamometer. Moreover, the discussions on the grip mechanism and the role of fingers were made. The results were summarized as follows : 1 : Grip power was decreased in approximately 15% of patients associated with ruptures of long pollicis flexor tendons, in 20% of all ruptures of sublimis and profundus flexor tendon of index finger, in 40% of all ruptures of sublimis and profundus flexor tendons of little finger. The decrease of grip power was also observed in 15% of patients associated with median nerve palsy, in 40% of the patients with ulnar nerve palsy and in 50% of the patients combined with median and ulnar nerve palsy. 2 : The ratio of act in the power grip of intrinsic to extrinsic muscles might be almost equalized. 3 : The radial-side fingers play an important role in order to grip the thicker cylinder (49Φ), and the ulnar-side fingers have the same function in the gripping of the thinner cylinder (251Φ). Generally, the adequate object through the power grip movement was measured approximatly 2.5cm in diameter. It is esteemed that ulnar-side fingers play a great role not only as a stabilizer but also as an essential motor and the role of ulnar-side finger is more important than that of general conception.