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Qi S.-H.,Jinshan District Tinglin Hospital | Xu H.-H.,Jinshan District Tinglin Hospital | Shi B.-S.,Jinshan District Tinglin Hospital | Xia C.-H.,Jinshan District Tinglin Hospital | And 3 more authors.
Chinese Journal of Tissue Engineering Research | Year: 2013

BACKGROUND: With the wide application of interlocking intramedullary nail, the issues of delayed fracture healing and interlocking nail fracture are gradually revealed, thus the keyhole and lockpin shank transition combined with interlocking intramedullary nail come into being. OBJECTIVE: To observe the stability of keyhole and lockpin shank diameter transition combined with interlocking intramedullary nail and traditional interlocking intramedullary nail fixation. METHODS: Eight bilateral femoral fracture specimens were used and the fracture sites were fixed with eight keyholes and lockpin shanks diameter transition combined with interlocking intramedullary nail and traditional interlocking intramedullary nail fixation. In the experimental group, the customized intramedullary nail distal aiming fine-tuning device was used to install the matching equipment nail, and then interlocking fixed by customized interlocking nail with the diameter of 4.3 mm; in the control group, conventional matching installation equipment was used, and then interlocking fixed by interlocking nail with the conventional diameter of 4.0 mm. The specimens in two groups were fixed with the methods above respectively, and then the displacement from left to right, from forward to backward and the rotation displacement of the femoral fracture sites in two groups were recorded and measured, in order to compare the stability of the fracture fixation. RESULTS AND CONCLUSION: For the treatment of middle femur fracture with keyholes and lockpin shanks transition combined with interlocking intramedullary nail fixation, when loaded with 10 N force, the femoral fracture sites had 1.22 mm displacement from left to right, 1.22 mm from forward to backward and 0.33 mm rotation displacement; when the traditional interlocking intramedullary nail keyhole loaded with 10 N force, the femoral fracture sites had 3.26 mm displacement from left to right, 3.37 mm from forward to backward and 2.15 mm rotation displacement. The displacement from left to right, from forward to backward and the rotation displacement of the fracture sites after fixed with lockpin shanks transition combined with interlocking intramedullary nail were smaller than those after fixed with lockpin shanks transition combined with traditional interlocking intramedullary nail, and the differences were significant. The results indicate that keyhole and lockpin shank transition combined with interlocking intramedullary nail fixation can improve the stability of fracture site. Source

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