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首页> 外文期刊>Clinical biomechanics >Effect of wrist position on thumb flexor and adductor torques in paralysed hands of people with tetraplegia.
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Effect of wrist position on thumb flexor and adductor torques in paralysed hands of people with tetraplegia.

机译：手腕位置对四肢瘫痪者瘫痪手拇指屈肌和内收肌扭矩的影响。

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摘要

BACKGROUND: People with tetraplegia often have extensive paralysis of the hand yet retain crude hand function. Their hand function is dependent on manipulating wrist position with the neurally-intact wrist extensor muscles to change the passive tension in paralysed thumb muscles. This moves the thumb in relation to the paralysed index finger enabling basic grasp. The aim of this study was to quantify the effect of wrist position on thumb flexor and adductor torques generated in paralysed hands of people with tetraplegia. METHODS: Thumb flexor and adductor torques were measured as the wrist was passively moved from a fully flexed to a fully extended position in 10 people with tetraplegia who had paralysis of all thumb muscles. The relationships between thumb torques and wrist angles were quantified with torque-angle curves. FINDINGS: There was a consistent curvilinear relationship between wrist angle and both thumb flexor and thumb adductor torques. Thumb flexor torques were greatest and thumb adductor torques were smallest when the wrist was fully extended. INTERPRETATION: Wrist position influences the thumb flexor and adductor torques generated in the paralysed hand. This is probably due to the effect of wrist position on the passive tension of the thumb muscles spanning the wrist. These findings have implications for people with C6 and C7 tetraplegia who rely on the passive torques generated by the paralysed thumb muscles for hand function.
机译：背景：四肢瘫痪的人常常手部广泛麻痹，但保留了粗略的手功能。它们的手功能取决于神经完好无损的腕部伸肌控制腕部位置，以改变瘫痪的拇指肌肉中的被动张力。这使拇指相对于瘫痪的食指移动，从而实现了基本抓握。这项研究的目的是量化手腕位置对四肢瘫痪者瘫痪手中产生的拇指屈肌和内收肌扭矩的影响。方法：在十名四肢瘫痪，四肢瘫痪的人中，将腕部从完全屈伸位置被动移至完全伸展位置时，测量拇指屈肌和内收肌扭矩。拇指扭矩和腕部角度之间的关系通过扭矩角度曲线量化。结果：腕部角度与拇指屈肌和拇指内收肌扭矩之间存在一致的曲线关系。当手腕完全伸展时，拇指屈肌扭矩最大，拇指内收肌扭矩最小。解释：腕部位置会影响瘫痪手产生的拇指屈肌和内收肌扭矩。这可能是由于手腕位置对跨过手腕的拇指肌肉被动张力的影响。这些发现对患有C6和C7四肢瘫痪的人有影响，他们依赖于瘫痪的拇指肌肉产生的被动扭矩来实现手功能。

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