The article describes the case of successful single-stage substitution of sub-total defect III metacarpal bone graft III metatarsal bone after radical sub-total resection of the affected area Distal part of the 3rd metacarpal bone, due to osteoblastristoma. The peculiarity of this case is the momentary substitution of the defect of the distal joint head of the 3rd metacarpal bone with the help of a similar Graft III metatarsal bone. Radical resection of the unit of the affected sub-total

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... of the metacarpal bone allows to minimize the risk of local relapse. One-moment compensation of the defect in the same Graft III metatarsal bone allows not only to restore the lost anatomy, but also to achieve the desired cosmetic and functional effect. Keywords: Osteoblastoclastoma; Resection of the affected segment of metacarpal bone; Avascular bone-articular autograft of the metatarsal bone; Reconstruction of the bone defect of the metacarpal bone.