1. An orthopedic device for a shoulder joint comprising: a patient-specific alignment guide including: a cap comprising a hemispherically-shaped shell, the shell having an exterior surface and a customized interior surface configured to be complementary and match at a selected particular position on a humeral head of a specific patient, and the shell including a peripheral edge that terminates at a portion of an anatomic neck of the humeral head, a periphery of the cap being configured to surround an anatomic neck of the humeral head; an elongated tubular element extending from the cap and defining a longitudinal guiding bore configured for guiding an alignment pin at a patient-specific position and an orientation determined in the pre-operative plan; a tab extending away from the periphery of the cap, the tab configured and sized and shaped to be received at least partially in a bicipital groove of the humeral head to orient the cap relative to the humeral head when the orientation feature is aligned with the bicipital groove; and a resection formation provided at the periphery of the cap, the resection formation being configured for guiding a resection of the anatomic neck of the humeral head.