股骨近端主张力骨小梁生物力学特性

目的 研究股骨近端主张力骨小梁的生物力学性能,为解释股骨颈骨折后股骨头坏死的发生原因提供实验依据.方法 取8个正常国人(45 ～60岁)尸体股骨,排除畸形、骨折等病变.将近端主张力骨小梁系统从外侧到内侧分成3个区,在每个区内沿主张力小梁方向及与其垂直方向切取骨小梁试件,并分别在EnduraTEC ELF3200生物力学...

Biomechanical properties of principle tensile trabecular bone in proximal femur

Objective To investigate the biomechanical properties of principal tensile trabecular bone in proximal femur and provide experimental evidences explaining the osteonecrosis of femoral head resulting from femoral neck fracture.Methods Eight human cadaveric femurs,with no deformities,fractures,and other lesions,were selected.The principal tensile trabecular bone system was devided into three parts from the exterior to the interior.Specimens were taken in each part along or perpendicular to the direction of principal tensile trabecular,respectively.Mechanics tests were performed by BOSE Enduratec ELF 3200.The ultimate tensile and compressive strength,yield tensile and compressive strength and elastic modulus of principal tensile trabecular bone in proximal femur were obtained.Results The tensile properties were higher than compressive properties in exterior parts,especially the tensile biomechanical properties along the direction of principal tensile were significantly higher than the compressive biomechanical properties in that direction.In the meddle part,the compressive properties were higher than the tensile properties both along the directions of principal compression and principal tension.In the interior part,the compressive properties were higher than the tensile properties along the direction of principal compressive trabecular bones,the tensile properties were higher than the compressive properties along the direction of principal tensile trabecular bone.Conclusion The major function of exterior part of principal tensile trabecular bone is loading tensile stress,that of the middle part is loading compressive stress,and that of the interior part is loading compressive stress along the direction of principal compression,while the major function along the direction of principal tensile trabecular bone is loading tensile stress,which indicate that the structure of trabecular bone is anisotropic and adapted to its function.