Cause of micromotion in distal femoral prosthesis / 浙江大学学报·医学版
Journal of Zhejiang University. Medical sciences
;
(6): 193-197, 2010.
Article
in Chinese
| WPRIM
| ID: wpr-259218
ABSTRACT
<p><b>OBJECTIVE</b>To investigate possible causes of micromotion in distal femoral prosthesis.</p><p><b>METHODS</b>Based on the assumption that the femur and prosthesis were considered as concentric cylinders with completely bonded interface, a theoretical model simulating the interfacial stress transfer was established. The distributions of the interfacial shear and radial stresses with the changing of z were obtained through mathematics and mechanics deducing.</p><p><b>RESULTS</b>The maximum interfacial shear stress occurred at the position of z=0, namely, the cross section of the femur neck. The interfacial shear stress sharply decreased with the increasing of z and came to nearly zero at the range of z> 0.1 m. While the interfacial radial stress increased with the increasing of z,at the range of z >0.05 m it was constant and reached the maximum.</p><p><b>CONCLUSION</b>The micromotion in distal prosthesis is caused by the interfacial radial stress.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Prosthesis Design
/
Stress, Mechanical
/
General Surgery
/
Biomechanical Phenomena
/
Shear Strength
/
Femur
/
Hip Prosthesis
/
Joint Instability
/
Models, Theoretical
/
Motion
Limits:
Humans
Language:
Chinese
Journal:
Journal of Zhejiang University. Medical sciences
Year:
2010
Type:
Article
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