الفهرس 
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Abstract
The strain distribution in the loaded cadaver femora are measured in situ using & strain gauges sets mounted to the cortex. The loading conditions simulated single limb stance. The strains are recorded, firstly with the intact femur at three states :
a- Under variable loads.
b- Under impact loads.
c- Under constant load for variable time.
The first group of tests are conducted utilizes natural intact femur, the second and the third groups of tests are passed upon artificial component. At the second group, the artificial component inserted in a femoral bone with natural neck length of 5 mm while at the third group, the artificial component inserted in a femoral bone without natural neck.
It is found that, the stress pattern in the proximal part of the femur is reversed as compared as with that for the intact femur. In addition, the maximal strain is occurred around the stem tip of the prosthesis rather than at the calcar femoral.
A massive decrease in stress in the region of the calcar femoral is found when the implant is in place. Retaining the natural femoral neck in total or partial hip replacement lowers the stress distribution significantly compared with the case after resecting the full neck.
It lowers the harm full tensile stress level yet increase that of beneficial compressive stresses level, it is noted that the stress levels tend to be constant in the long run for each of the three groups provides more protection against the risk of the mechanical failure.