A bone plate sized and shaped for fixation to the phalanx is a head extending from a first end to a second end, the first and second extending through the head. A hole for the second, third and fourth fixing elements, the hole being arranged in a diamond structure on the head, the outer wall of the head having a diamond shape corresponding to the diamond structure, The bone contact surface of the part is contoured to conform to the anatomy of the back surface of the first metacarpal bone, and the contour is seated on the protrusion at the head of the first metacarpal bone A head portion that is curved so as to include a shaft portion extending from the head portion and elongated in a direction parallel to the longitudinal axis of the bone plate； Is provided.
