This is a report on a small series of cases with hypoplastic thumb (Fig. 1) treated with a metatarsophalangeal transfer. We hereby certify that all applicable institutional and governmental regulations concerning the ethical use of human volunteers were followed during this research. Ethics committee of the Arak University of the medical Science approved the design of the study (IR.ARAKMU.REC.1400.230). Informed written consent was obtained from all participants.

Hypoplastic thumb: an underdeveloped, floating, nonfunctioning thumb with no bony or muscular support, attached to the hand by only skin and soft tissue

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