Date of Award
5-2024
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Bioengineering
Committee Chair/Advisor
John D. DesJardins
Committee Member
Jiro Nagatomi
Committee Member
Reed Gurchiek
Abstract
Reverse total shoulder arthroplasty (RTSA) is a procedure that aims to fix irreversible rotator cuff damage and degenerative glenohumeral joint diseases that hinder arm abduction. One major complication of RTSA is glenoid baseplate failure resulting from increased movement at the bone-baseplate interface. This study examined 36, 12 PCF composite Sawbones® scapulae. The specimens were split equally into 6 study groups, each having different implant configurations with varying baseplate lateralization and central screws or posts. Each specimen was subjected to cyclic shear loading and failure testing on an Instron to determine implant micromotion and load values.
After testing, ANOVA tests were run at a 95% confidence interval. At 150 microns of movement, no groups were statistically significant from each other with a cumulative p-value of 0.3908. At implant failure, group 5 and group 1 were statistically significant. Group 5 had a p-value of 0.0049 with an average load of 1301.08 N. Group 1 had a p-value of 0.0133 with an average load of 1267.13 N. From the results at 150 microns of movement, all 6 study groups will perform the same under typical shoulder usage without major implant movement. At implant failure, the study results prove that post and screw constructs that have 4 mm lateralized glenospheres achieve the best bone-baseplate interface and can withstand the highest forces. Limitations of the study include small variations in implant alignment angles and the Sawbones® model not being of clinical relevance due to a lack of anatomical components.
Recommended Citation
Gunnison, Mickaela J., "The Effect of Central Screw and Post Vault Containment on Reverse Total Shoulder Arthroplasty (RSTA) Baseplate Stability" (2024). All Theses. 4313.
https://open.clemson.edu/all_theses/4313