示指完全切断再接着後に奇異的伸展現象を生じた１例

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  • Paradoxical Extension Phenomenon Arising on the Index Finger after Replantation: A Case Report

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<p> Lumbrical plus finger is the clinical presentation of paradoxical extension phenomenon (PEP). It is characterized by the extension of the interphalangeal joints when flexing the fingers. The mechanism is a contraction of the flexor digitorum profundus (FDP) transmitted through the lumbrical muscle to the extensor's expansion hood and lateral band.<br> We report a case of PEP following tuft amputation of the index finger of a 45-year-old man. In addition to tenolysis, release of the lumbricalis tendon was sufficient to treat his symptoms. There was no recurrence during the 6-month follow-up after surgery. Contracture of the lumbrical muscle and abnormal FDP were considered the causes of PEP.</p>

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