Advisor(s)
Alan Eberhardt
Committee Member(s)
Eugene Brabston
Jack Lemons
School
Joint Health Sciences (Interdisciplinary)
Document Type
Thesis
Department (new version)
Biomedical Engineering
Date of Award
1-7-2025
Abstract
Anatomic total shoulder arthroplasty (ATSA) is a surgical procedure in which both the humeral head and the glenoid cavity are replaced with implants resembling the natural anatomy of the shoulder. Several complications may occur after an ATSA, but the most common is glenoid loosening, which makes up about 37.7% of these complications. The overall structure of a glenoid implant is a concave oval plate commonly manufactured from ultra-high molecular weight polyethylene (UHMWPE) with various stabilizing structures, including pegs, protruding from the back of the implant. For this study, the focus was on Catalyst OrthoScience’s pegged glenoid implants and how the angle of these pegs alters the stability of the implant. The intention for designing a glenoid implant with angled pegs was to establish a way for the surgical preparation and implantation to be completed at an angle congruent to the orientation of the surgeon’s exposure to the implantation site. Thus, fewer forceful retractions of soft tissues and less bone and soft tissue trauma would occur. The purpose of this study was to quantify the micromotion of Catalyst OrthoScience’s novel glenoid implant design with varying peg angles of 0-, 8.25-, and 17.5- degrees. The glenoid implants were secured in bone substitute with polymethylmethacrylate (PMMA) bone cement and then cyclically tested against a humeral head implant for 50,000 cycles to represent five years of use of someone completing roughly 25 higher-load activities per day. Throughout the cyclic tests, displacement of the glenoid implant’s top rim was measured using Tracker, a video tracking software. Videos of the test were taken on an iPad and uploaded into Tracker for micromotion detection and documentation. The micromotion of the glenoid designs with angled pegs quantitatively compared (p > 0.5) to the micromotion of the glenoid design with peg angles of 0-degrees. Moreover, all micromotion was found to be less than 150 um, which is the threshold to allow bone formation within porous-surfaced implants.
ProQuest ID
Recommended Citation
Schilling, Erica Nicole, "A Biomechanical Comparison Of Varying Peg Angles On Glenoid Implant Stability For Anatomic Total Shoulder Arthroplasty" (2025). All ETDs from UAB. 7271.
https://digitalcommons.library.uab.edu/etd-collection/7271
