1. A glenoid placement guide, comprising:a hub;
a plurality of radial arms extending from the hub;
a plurality of peripheral guide structures, each of the peripheral guide structures affixed to a corresponding one of the radial arms, wherein each peripheral guide structure includes a patient-specific surface configured to engage a rim of a patient's glenoid at a predetermined location, and wherein each of the radial arms has a patient-specific length configured to align the corresponding peripheral guide structure with the rim of the patient's glenoid at the corresponding predetermined location;
a depth-control pin, wherein the depth-control pin comprises:
a cylindrical shaft having a first and a second end;
a threaded portion on the first end; a receiving portion on the second end; and
a collar located between the threaded portion and receiving portion;
a central port comprising a cylindrical opening passing through the hub, wherein the central port is partially defined by a cylindrical housing extending beyond an upper surface of the hub, wherein the cylindrical housing is configured to act as a depth guide indicator for a depth of the depth-control pin inserted through the cylindrical opening such that a collar of the depth-control pin is flush with an upper surface of the cylindrical housing; and a plurality of anchoring pin channels, wherein each channel comprises a cylindrical opening passing through the hub from the upper surface of the hub to a lower surface of the hub, the cylindrical opening configured to receive and guide an anchoring pin configured to anchor the glenoid placement guide to a glenoid surface when the peripheral guide structures are engaged with the rim of the patient's glenoid at the predetermined locations.