Please login to view this media
- Talk
- Canada
The Effect of Short Stem Humeral Implant Varus-Valgus Position on Bone Stress following Total Shoulder Arthroplasty
Description
The presentation delivered by Amir Tavakoli discusses the implications of total shoulder arthroplasty, particularly focusing on stress shielding caused by metallic implants altering the natural anatomy of the glenohumeral joint. It emphasizes how stress shielding leads to bone resorption, referencing Wolff's law regarding bone stress distribution.
Visual aids are used to illustrate preoperative and postoperative images, highlighting changes over a seven-year follow-up, with specific attention to how stem axis deviations can negatively affect bone stress distribution.
The research aims to assess the impact of varus and valgus angulations of short-stem humeral components on humeral bone stresses, positing that optimal positioning will mitigate bone stress changes. The methodology involves 3D reconstruction of cadaveric humeri, followed by simulations of different stem positioning masked by various angulations in a controlled environment.
Findings indicate that valgus positions result in the greatest changes in cortical bone stress patterns, leading to higher bone resorption compared to varus or standard positions. The study concludes that valgus angulation should be clinically avoided to reduce stress shielding and potential bone complications.