A method for performing an arthroplasty on at least one of a glenoid or a humerus of a glenohumeral joint. The method includes the following: forming an entry incision in soft tissue superior and lateral to the glenohumeral joint； forming a passage from the entry incision to the glenohumeral joint； inserting a cutting instrument through the passage and cutting a humeral head of the humerus to prepare the humerus to receive an implant including a stem； inserting the implant through the passage； and securing the implant relative to the humerus with the implant oriented such that the stem extends substantially parallel to a longitudinal axis of the humerus.
