| Objective: To construct a three-dimensional finite element model of upper thigh-bone. To discuss the production mechanism of the six segments classification of femur Intertrochanteric fracture and make suggestions on different operation modes Methods: Scaned a normal sixty man’s upper bilateral thigh-bones using 64-slice CT. Keep the picture in the form of JPG and made a three-dimensional model by leading it into photoshop7.0. Made a three-dimensional finite element model of upper thigh-bone by using software Super93 and the three-dimensional picture which was made before. In this model, there were 764 joints, 531 units, among which existed 306 compact bone units and 225 chancellors bone unit. Use this model to imitated and analyzed the distribution of stress of trochanter during one’s tumbling Results: Analysis of stress reprogram shows that when simple hip is adducted, stress is distributed between the trochanter and the cortical bone which is located at the lower part of exterior trochanter. When the simple hip is abducted, stress is focused on the interior cortical bone and it will be transferred into the front exterior or back interior cortical bone which is located at the bottom of trochanter if there’s a strong force of switch at the same time. Conclusion: The six segments model of thigh-bone’s trochanter is suitable for the explanation of complex stress distribution when one falls down. The model combined with reconstruction of three-dimensional CT is more intuitive than other models and it can give suggestions on different kinds of operations. |
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