Contour guide for small bone surface modification

A method of modifying a bone surface for receiving an implant, the method comprising:

• positioning a contour guide at a first bone and a second bone and across a separation between the first bone and the second bone;
• using the contour guide to modify a surface region of at least one of the first bone and the second bone to form a modified surface region at one or both of the first bone and the second bone where a bridge of an implant is configured to be positioned;
• positioning the bridge of the implant in contact at least with the modified surface region.