不同直径主钉及远端锁钉对交锁髓内钉力学性能影响的三维有限元分析
Influence of different nail and distal locking screw diameters on biomechanical properties of interlocking intramedullary nail
目的 测定不同直径主钉及远端锁钉对交锁髓内钉刚度及应力分布的影响，为临床髓内钉的选择提供力学依据。 方法 选取临床常用的不同直径主钉及远端锁钉，建立A到F共6组髓内钉和一例股骨横断骨折三维有限元模型，导入ABAQUS进行有限元分析。测量锁钉刚度以及应力分布情况。 结果 各组模型应力均未达到屈服应力，主钉直径越大，刚度越大（P=0.005）；远端锁钉直径越大，主钉最大应力越小（P=0.009）；锁钉最大应力越小（P=0.006）。其中F组模型刚度最大，主钉最大应力，锁钉最大应力最小，分别为670.52 N/mm、276.5 Mpa、168.3 Mpa。 结论 临床常用髓内钉器械直径范围内，主钉、远端锁钉直径越大，交锁髓内钉越稳定。
Objective To predict the stiffness and stress distributions in interlocking intramedullary nail with different nail and distal screw diameter using 3-D finite element analysis. Methods 3-D finite element models of the intramedullary nail with different nail and distal screw diameter that are commonly-used in clinical practice were generated. A 3-D model of femur was also created. Then finite element analysis was performed in Abaqus. The stiffness and stress distributions were calculated. Results Stresses of all models do not exceed yield strength. Larger nail diameters were significantly associated with larger stiffness (P=0.005). The maximum stiffness is 670.52N/mm. Larger distal locking screw diameters were significantly associated with larger maximum principal stress in nail (P=0.009) while with smaller maximum principal stress in distal locking screw (P=0.006). The minimum maximum principal stress is 276.5Mpa and 168.3Mpa in nail and distal locking screw, respectively. Conclusions In the range of commonly-used intramedullary nail in clinical prac- tice, the larger the diameters are of the nail and distal locking screw, the more stable the intramedullary nail is.
Finite element analysis / Intramedullary nail / Distal locking screw
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