Today nonconforming glenohumeral implants are a common choice for total shoulder arthroplasty (TSA). Use of the conforming implant has decreased because of the “rocking-horse” effect , which leads to high stress and moments at the glenoid rim when the humeral head subluxes during range of motion. Retrieval studies have provided evidence that the rocking-horse effect is the major cause of implant loosening and fracture, delamination and deformation of the glenoid rim. Nonconforming glenoid implants, owing to a larger radius of the glenoid articular surface, can reduce the rocking-horse effect by improving the rim-head contact during subluxation. However, the nonconforming shape increases the contact stress and instability when the humeral head is in the central region, where motion frequently occurs .
- Bioengineering Division
Effect of Glenoid Shape on Stress in Glenoid Implants Undergoing Superior Subluxation
- Views Icon Views
- Share Icon Share
- Search Site
Li, J, Gardner, TR, Levine, WN, Bigliani, LU, & Ahmad, CS. "Effect of Glenoid Shape on Stress in Glenoid Implants Undergoing Superior Subluxation." Proceedings of the ASME 2008 Summer Bioengineering Conference. ASME 2008 Summer Bioengineering Conference, Parts A and B. Marco Island, Florida, USA. June 25–29, 2008. pp. 863-864. ASME. https://doi.org/10.1115/SBC2008-192776
Download citation file: