Indexed tri-planar osteotomy guide and method

A method of performing an osteotomy on a metatarsal bone having a proximal portion and a distal portion, the proximal and distal portions defining a first relative position between them, the method comprising:

• determining a desired positional change between the proximal portion of the metatarsal bone and the distal portion of the metatarsal bone in at least two anatomic reference planes;
• mounting a guide on the metatarsal bone;
• establishing an osteotomy plane or rotational axis with the guide;
• guiding a cutter in the osteotomy plane or about the rotational axis to produce cut surfaces in the metatarsal bone such that the distal portion of the metatarsal bone and proximal portion of the metatarsal bone are relatively rotatable, the cut surfaces being oriented to incorporate the desired positional change in the at least two anatomic reference planes;
• rotating the distal portion of the metatarsal bone relative to the proximal portion of the metatarsal bone to a second relative position different from the first relative position;
• and
• fixing the distal portion of the metatarsal bone and the proximal portion of the metatarsal bone relative to one another in the second relative position with the cut surfaces of the proximal portion of the metatarsal bone and the distal portion of the metatarsal bone abutting one another.