Osteotomy guide

A guide for a bone cut, comprising:

• a guide base having an inner wall defining an opening, the guide base having a proximal surface adapted to contact a skin of a person;
• and
• an inner collar having an outer surface, the inner collar having an inner wall defining a bore for receiving a cutting tool, the inner collar configured to pivot the cutting tool about a pivot axis of the guide, for cutting a bone,
• one of the inner wall of the guide base or the outer surface of the inner collar having one or more detents distributed thereon,
• the other of the inner wall of the guide base or the outer surface of the inner collar having one or more coupling mechanisms extending therefrom in opposite directions, the inner collar mountable so that the one or more coupling mechanisms fit within two of the plurality of detents, and the coupling mechanisms are located along or parallel to the pivot axis.

A guide for cutting a bone, comprising:

• a body having:
• a proximal surface adapted to contact a skin of a person,
• a distal surface opposite the proximal surface, the distal surface having one or more distal channels, each distal channel having a respective longitudinal axis forming an oblique angle with the distal surface, each distal channel having a bottom surface extending partially around the respective longitudinal axis thereof, each distal channel extending from the bottom surface to the distal surface, so each distal channel has a varying depth, and
• a central bore extending through the body, from the proximal surface to the respective bottom surface of each respective distal channel, the central bore adapted to receive a drilling or cutting tool therethrough.

A guide for cutting a bone, comprising:

• a cylindrical body having:
• a proximal surface adapted to contact a skin of a person, the proximal surface having a proximal chamfer at a center thereof,
• a distal surface opposite the proximal surface, the distal surface having a distal chamfer at a center thereof,
• the cylindrical body having an inner wall defining a central longitudinal bore extending through the body from the proximal chamfer to the distal chamfer, the central bore adapted to receive a drilling or cutting tool therethrough, and
• the cylindrical body having a circumferential surface with a plurality of radial bores extending inward from the circumferential edge, the radial bores adapted to receive fixation elements therein.

A method comprising:

• selecting a guide having a predetermined chevron angle from among a plurality of guides having a plurality of respective chevron angles, the selected guide having a proximal surface and a distal surface, the distal surface having one or more channels, each of the one or more channels having a longitudinal axis arranged at an oblique angle relative to the distal surface, the guide having a respective marker on the distal surface opposite each of the one or more channels;
• adhering the proximal surface of the selected guide to a skin of a patient;
• inserting a cutting tool into a central bore, where each of the one or more channels extends radially from the central bore;
• aligning the marker opposite the selected channel with a direction of a cut;
• tilting the cutting tool toward the selected channel.