Systems and methods of thumb caropmetacarpal joints implants

An apparatus, comprising:

• a metacarpal implant comprising:
• a stem configured to be inserted into a first cavity of a metacarpal bone and having a first end and a second end;
• a radial lip extending from the second end;
• an opening extending from the radial lip to the first end, wherein the stem comprises an inner stem surface facing the opening and the radial lip comprises an outer surface and an inner lip surface facing the opening, the inner stem surface and the inner lip surface connected by a surface perpendicular to the inner stem surface;
• a first aperture extending through the radial lip from the outer surface to the inner lip surface;
• and
• a second aperture extending through the radial lip from the outer surface to the inner lip surface;
• and
• a spacer comprising:
• a spacer head portion having a top surface and a bottom surface, the top surface having a smooth shape and being convex on a third plane and concave on a fourth plane;
• and
• an opening insert to be inserted in the opening and extending from the bottom surface.

A metacarpal implant comprising:

• a stem configured to be inserted into a first cavity of a metacarpal bone and having a first end and a second end, the second end comprising a seat;
• a radial lip extending radially outwards from the seat;
• an opening extending from the radial lip to the first end and comprising a first portion, a second portion, and a third portion, the first portion located within the radial lip and the second portion and the third portion located within the stem, the seat extending from the second portion and connecting the first portion and the second portion;
• a first aperture extending through the radial lip;
• and
• a second aperture extending through the radial lip.