Influence of different nail and distal locking screw diameters on biomechanical properties of interlocking intramedullary nail
TIAN Chong, ZHANG Mei-Chao, OU Yang-Jun
Chinese Journal of Clinical Anatomy ›› 2011, Vol. 29 ›› Issue (1) : 94-96.
Influence of different nail and distal locking screw diameters on biomechanical properties of interlocking intramedullary nail
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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