Guides and instruments for improving accuracy of glenoid implant placement

A patient-specific glenoid guide, comprising:

• a body having a lateral surface, a medial surface, and an outer periphery, the medial surface comprising a patient matched portion configured as a negative surface of a glenoid portion of a scapula of a specific patient;
• a plurality of peripheral members extending radially outward from the outer periphery of the body, each of the plurality of peripheral members comprising a contact member
• a locating feature on or through the body configured to reference a guide pin to locate the body relative to a glenoid;
• and
• a channel extending through the body from an entrance on the lateral surface to an exit on the medial surface and adapted to receive a pin guide,
• wherein the channel is tapered to form a temporary interference fit connection with the pin guide, and
• wherein the medial surface of the body is configured to be spaced apart from the glenoid portion when each contact member contacts a rim of the glenoid portion.

A patient-specific glenoid guide, comprising:

• a body having a lateral surface and a medial surface, the medial surface comprising a patient matched portion being configured as a negative surface of a glenoid portion of a scapula of a specific patient;
• a plurality of peripheral members extending radially outward from an outer periphery of the body, each of the plurality of peripheral members comprising a contact member;
• and
• a channel extending through the body from a channel entrance on the lateral surface to a channel exit on the medial surface,
• wherein the medial surface of the body is configured to be spaced apart from the glenoid portion when each contact member contacts a rim of the glenoid portion.