Reverse Shoulder Arthroplasty With Patient-specific Glenoid Implant Positioning Guides

This article describes the use of patient-specific glenoid implant positioning guides in reverse shoulder arthroplasty. After a cadaveric pilot study, reverse shoulder arthroplasty was performed in 7 patients using the patient-specific guides. The patient-specific glenoid implant positioning system provides for preoperative planning on a virtual 3D model of the scapula derived from CT scan images. The accuracy of the patient-specific guides was determined by comparing the postoperative version and inclination of the implant with the preoperatively planned values. The mean native version of the glenoid was 5.2 degrees of retroversion (range, +0.8 to −14.38 degrees; SD=5.3) and mean native inclination was 12.25 degrees of superior tilt (range, 8.07 to 18.24 degrees; SD=4.04). The mean version of the glenoid component as chosen in the preoperative planning was 0.42 degrees (range, −1 to 3 degrees; SD=1.27). The mean inclination chosen was 9.19 degrees (range, −8 to 10 degrees of inferior tilt; SD=0.91). Postoperatively, we achieved a mean version of 0.38 degrees (range, −2.85 to 2.0 degrees. SD=1.98) (negative values denote retroversion and vice versa). Postoperative mean inclination was −9.15 degrees (range, −7.5 to −11.1 degrees; SD=1.175) (negative values denote inferior tilt). The accuracy of reproducing the planned version was 0.04±0.71 degrees with a maximum error of 2.05 degrees and a minimum error of 0.4 degrees. The accuracy of reproducing the planned inc...
Source: Techniques in Shoulder and Elbow Surgery - Category: Orthopaedics Tags: Techniques Source Type: research