ZHANG Guangyu 1 , JIA Quanzhang 2 , GU Haidong 1 , CHEN Zhigang 1
  • 1School of Mechatronics Engineering, Harbin Institute of Technology, Harbin Heilongjiang, 150001, P.R.China;;
  • 2Department of Orthopaedics, the 208th Hospital of Chinese PLA.;
Mushroom shaped surface prosthesis; Femoral neck; Change rate of strain; Biomechanics
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Objective To investigate whether the biomechanical effect of mushroom shaped surface prosthesis on femoral neck is in the scope of safety after the replacement. Methods Four donated fresh-adult specimens of upper femur under the age of 55 years old were used. The strains of detecting points A (lateral) and B (medial) on the narrow place of femoral neck in the standing position were simulated for three stages before or after the prosthesis replacement, namely the pre-replacement, the initial stage during which the interspace of the prosthesis was filled with cancellous bone, and later
stage during which the interspace of the prosthesis was filled with bone cement. Then they were compared by using l inear regression analysis in Excel and rel iabil ity analysis. Results The regression analysis showed that the values of correlation coefficient r were all more than 99% at the different stages, indicating the strain of femoral neck’s cortical bone was proportional to the load and there was no occurrence of the plastic deformation of the femoral neck. For point A, the slope of the trend l ine of strain was 0.671 9 at the pre-replacement stage. The value of the initial stage after replacement was 0.619 2 and its change rate was —7.8%; while corresponding value was 0.662 7 and —1.4% at the later stage after replacement. For point B, the slope of the trend l ine of strain was —1.056 1 at the pre-replacement stage. The value of the initial stage after replacement was — 1.129 2 and its change rate was 6.9%; while corresponding value was —1.085 1 and 2.7% at the later stage after replacement. Conclusion The mechanical strength of femoral neck is in the scope of safety after surface replacement of the femoral head. The change rate of strain at the later stage is smaller than the initial stage.

Citation： ZHANG Guangyu,JIA Quanzhang,GU Haidong,CHEN Zhigang. BIOMECHANICAL EFFECT OF MUSHROOM SHAPED SURFACE PROSTHESIS ON FEMORAL NECK AFTER REPLACEMENT. Chinese Journal of Reparative and Reconstructive Surgery, 2009, 23(12): 1462-1465. doi: Copy