试题与答案

患者,男,26岁,厨师。1小时前切菜时不慎切伤右手中指,伤后其掌指关节不能伸直,而指

题型:单项选择题 共用题干题

题目:

患者,男,26岁,厨师。1小时前切菜时不慎切伤右手中指,伤后其掌指关节不能伸直,而指间关节仍可伸直

发生伤后掌指关节不能伸直,而指间关节仍可伸直的原因是什么()。

A.伸指肌腱断裂时将其止点所附着的骨骼撕脱,而指间关节因蚓状肌及骨间肌牵拉仍可伸直所致

B.伸指肌腱的中央束断裂,屈肌腱牵拉,而指间关节因蚓状肌及骨间肌牵拉仍可伸直所致

C.伸指肌腱的两侧束断裂,屈肌腱牵拉,而指间关节因蚓状肌及骨间肌牵拉仍可伸直所致

D.由于伸指肌腱在掌指关节近侧断裂,故无法伸直其掌指关节,而指间关节因蚓状肌及骨间肌牵拉仍可伸直

E.以上都不是

答案:

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