Patient-specific metacarpal prosthesis is a device intended for partial or total replacement of the metacarpal. This metacarpal prosthesis, which is designed using the mirror image of the contralateral metacarpal,is design to partially or totally replace the metacarpal bone. This prosthesis is designed to patients who are receiving a pain from the metacarpal bone tumor which could be progressive painful swelling and restricted movement of the thumb.This prosthesis provides a personalized solution that supports both functional and structural restoration of the thumb.