Impact of Prosthesis Design and Surgical Technique on Implant Stresses in Revision Hip Surgery
Author Information
Author(s): Heller Markus O, Mehta Manav, Taylor William R, Kim Dong-Yeong, Speirs Andrew, Duda Georg N, Perka Carsten
Primary Institution: Julius Wolff Institute and Center for Musculoskeletal Surgery Charité - Universitätsmedizin Berlin, Germany
Hypothesis
An increased offset, an increased anteversion, or their combination, would result in increased implant stresses, particularly in large bone defects.
Conclusion
Restoring femoral offset is unlikely to result in excessive implant stresses during routine activities if appropriate fixation is achieved.
Supporting Evidence
- Increasing the implant's offset by 10 mm led to a 16.7% increase in peak tensile stresses.
- Larger stresses were observed with reduced bone support, with a 59% increase for a type IIIb defect.
- The maximum tensile stress was 225 MPa for the increased offset design.
Takeaway
This study looked at how different designs and techniques for hip implants affect the stress on the implant. It found that while changing the design can increase stress, it won't likely cause problems if the implant is fixed properly.
Methodology
Finite element analyses were used to simulate the implantation of two prosthetic designs under varying bone defect conditions and surgical techniques.
Limitations
The study used a single stem diameter for all defects, which may overestimate stress shielding in less critical defect conditions.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website