Apparatus for repairing a shoulder joint, including a baseplate having a base portion having a medially-facing surface and a laterally-facing surface, and an opening passing through the medially-facing and laterally-facing surfaces for receiving a screw; and an anterior flange having an anteriorly-facing surface and a posteriorly-facing surface, the anterior flange extending away from, and perpendicular to, the medially-facing surface, the anterior flange having an opening passing through the anteriorly-facing and posteriorly-facing surfaces for accepting a screw; an articulating surface component for mounting to the laterally-facing surface for covering the laterally-facing surface; and an anterior cover for mounting to the anteriorly-facing surface and configured to lock the articulating surface component to the base portion, such that when the anterior cover is mounted to the anterior flange, the articulating surface component is locked to the base portion.