All ETDs from UAB

Advisory Committee Chair

Alan Eberhardt

Advisory Committee Members

Jack Lemons

Brent Ponce

Document Type


Date of Award


Degree Name by School

Master of Science in Biomedical Engineering (MSBME) School of Engineering


CYCLIC ELONGATION AND PULL OUT OF UNICORTICAL AND BICORTICAL SUTURE ANCHOR DESIGNS JUSTIN LESLEY BIOMEDICAL ENGINEERING ABSTRACT A novel suture anchor design was introduced and biomechanically tested. The novel design involved lengthening a standard metal screw type anchor so as to achieve greater fixation in bone. Along with utilizing a greater amount of trabecular bone, this design also allows a second layer of cortical bone to be involved in order to further enhance fixation. This "bicortcal" design is intended to be used under unique clinical circumstances. Such circumstances may include RC repair in patients with extreme osteoporosis, in cases where standard unicortical anchors have pulled out during surgery or in revision RC repairs where there is little unused bone available. Unicortical and bicortical suture anchors were implanted into cadaveric humeri and subjected to cyclic and single ramp failure loading in order to measure the fixation of the two anchor designs in the anchor to bone interface. The purpose of this study was to identify if there was a difference in the performance of the two anchor designs. Our hypothesis is that anchors of the bicortical design will show significant reduction in cyclic elongation as well as a significant increase in failure strength than anchors of the unicortical design. This study also compared cyclic elongation and failure strength with respect to anchor diameter, anchor position, gender and age between and within the two anchor designs. This was done in order to analyze trends, eliminate artifacts and isolate differences to unicortical vs. bicortical anchor designs. Keywords: Rotator Cuff, bicortical, suture anchor

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