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Published on: February 27, 2018
Femoral component positioning in resurfacing arthroplasty--effects on cortical strains
Frederick J Kummer1, Gavin Pereira, Aaron K Schachter
1NYU School of Medicine, New York, New York, USA. fkummer@yahoo.com
Bulletin of the NYU Hospital for Joint Diseases
|December 17, 2009
Summary
Femoral component positioning in hip resurfacing impacts femoral neck strains. A varus position may decrease superior neck strains, potentially mitigating risks like stress-shielding and fracture.
Area of Science:
- Orthopedic surgery
- Biomechanical engineering
- Biomaterials science
Background:
- Femoral component positioning in hip resurfacing arthroplasty is critical.
- Potential effects on femoral neck biomechanics and implant longevity are a concern.
Purpose of the Study:
- To investigate how femoral head translations and angulations affect femoral neck strains.
- To identify optimal component positioning for improved implant survival.
Main Methods:
- Utilized a strain-gaged Sawbones model of the proximal femur.
- Simulated various femoral resurfacing head positions (translations and angulations).
- Measured resultant strains in the femoral neck.
Main Results:
- Most tested head positions significantly increased femoral neck strains (often >100%).
- A varus head position uniquely decreased superior neck strains by over 50%.
- Strain distribution was highly sensitive to component positioning.
Conclusions:
- Femoral component positioning critically influences femoral neck biomechanics.
- A varus position may reduce detrimental strains, potentially improving outcomes.
- Further clinical correlation is needed to understand implications for stress-shielding and fatigue fracture.
