Initial Fixation of the Trabecular Metal Reverse Shoulder Glenoid Base Plate Implant

Background Reverse total shoulder arthroplasty is an increasingly utilized treatment option for glenohumeral arthritis with massive, irreparable rotator cuff disruption associated with loss of glenohumeral stability and function. Several reverse shoulder implant designs from different manufacturers have been introduced to the market in recent years. Fixation of the glenoid base plate has been shown to be sensitive to the implant geometry and clinical complications related to the glenoid implant have been reported. The Zimmer® Trabecular MetalTM Reverse Shoulder prosthesis is designed to achieve both initial and long-term stability of the glenoid base plate implant through a unique combination of screw fixation and biological ingrowth. The purpose of this paper is to report on the testing that was conducted to quantitatively assess the effect of bone quality on the initial fixation of the Trabecular Metal Reverse Shoulder glenoid base plate implant.