Related Experiment Video
Updated: Aug 6, 2026

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
Published on: March 12, 2021
Glenoid loosening in response to dynamic multi-axis eccentric loading: a comparison between keeled and pegged designs
C Roche1, L Angibaud, P H Flurin
1Product Development Manager, Exactech, Inc., 2320 NW 66th Court, Gainesville, Florida 32653, USA.
Abstract:
Glenoid loosening is a common failure mode observed in total shoulder arthroplasty. In an effort to isolate the affect of differing fixation techniques on loosening, an edge displacement test was conducted using two, pear-shaped, UHMWPE glenoid designs: one keel and one peg, each having a glenohumeral radial mismatch of 4.3 mm. The susceptibility of each design to loosening was established by quantifiably comparing the maximum glenoid edge displacement before and after 100,000 cycles of eccentric loading by the humeral head along both the superoinferior (SI) and anteroposterior (AP) glenoid axes. Regardless of the axes tested, the results of this study indicate that no discernable difference in edge displacement (distraction and compression) occurred before or after cyclic, eccentric loading for either the keeled or pegged glenoid designs. Additionally, each keel andpeg glenoid remained firmly fixed after testing, suggesting that either fixation technique provides sufficient resistance to edge displacement.
Related Concept Videos
Eccentric Axial Loading in a Plane of Symmetry
General Case of Eccentric Axial Loading
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical bending,...
Eccentric Loading
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
Design of Columns under an Eccentric Load
Deformation of Member under Multiple Loadings
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...