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An Experimental Study of The Effect of Femoral Stem Anteversion on the Strain Distribution of Proximal Femur
Objective: To study the biomechanical characteristics of proximal femur under three different femoral stem anteversions. Methods: 15 pieces of fresh femur specimens of adults were randomly divided into 3 groups with 5 pieces in each group. 12rosettes were attached to each specimen at four levels along the proximal femur. The specimens were loaded and data were recorded. Then osteoectomy were performed. In the first group stems were implanted with anteversions being the same as the original anteversions of each specimen. In the second group stems were implanted with anteversions 15 degree greater than the original anteversions. And in the third group all stems were placed with anteversions 30 degree greater. All the specimens were loaded under the same condition and the data were recorded. Results: The strain distribution of the second group was most similar to that of the intact fumurs with more proximal loading than the other two groups. Conclusions: The most satisfactory proximal fit and loading can be achieved by implanting the stem with an anteversion 15 degree more then the original one. In this group the stress shielding is the least significant, thus the bone growth and long -term stability is desirable.
