Investigation of wrist joint cuff material and shape in a new pneumatic-type dynamic splint for wrist joint disease : Using blood flow and electromyography

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  • 手関節疾患に対する新しい人工筋型動的スプリントにおける手関節カフの素材と形状の検討
  • —血流量と筋電図を用いて—

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Abstract

<p>This study aimed to compare the effects of the wrist joint cuff material and shape of the artificial muscle type dynamic splints on fingertip blood flow and muscular activity. Eight hands from 4 male subjects with an average age of 26.2 years were analyzed. A semiconductor laser tissue blood flow meter was used for pulse group measurements. The electromyography was measured using TRIAS at the weak position and at 60° in both the wrist flexion and dorsiflexion directions with the splint attached. The mesh type and polyurethane type significantly decreased in the dorsal flexion direction after 5 minutes (p<0.05). In the palmar flexion direction, the mesh type cuff decreased significantly 3 or 5 minutes after the start of correction (p<0.05). With respect to EMG, significantly higher muscle activity was associated with dorsal flexion movement and the mesh type cuff (p<0.05). Considering the material and shape of the wrist cuff, it is recommended to use a polyurethane type with a double structure when installing an artificial muscle type splint. However, it is necessary to pay attention to the DTSaM structure, which tends to decrease the blood flow in the dorsiflexion direction even for the polyurethane type.</p>

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