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[Cause of micromotion in distal femoral prosthesis]
Wen-wei Dong1, Xue-zhong Yu, Yi-mu Guo
1The Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310009, China.
Objective:
To investigate possible causes of micromotion in distal femoral prosthesis.
Methods:
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.
Results:
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.
Conclusion:
The micromotion in distal prosthesis is caused by the interfacial radial stress.
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