Abstract
BackgroundIn the present study, we evaluated the mechanical outcome of different configurations formed by fully threaded screws and partially threaded screws in the treatment of unstable femoral neck fracture.MethodsThe Pauwels type III unstable femoral fracture and the models of the fully threaded screw and partially threaded screw were constructed in 3-matic software and UG-NX software respectively. We then assembled the different screw configurations to the fracture model separately to form the fixation models. After meshing the models’ elements, we used Abaqus software to perform the finite element analysis. Parameters of von Mises stress distribution on the screws, peak stress, displacement between fracture fragments, and model principal strains in cancellous bone were reported.ResultsOur results indicated that the peak von Mises stresses of screws was concentrated in the middle surface of the screw near the fracture line in each group. Peak stress value of the implants was highest in the model of triangle with posterior single screw. And the lowest stress values were observed in the triangular model. Fully threaded screw in each group underwent the most stress while partially threaded screw underwent a little bit of stress. Lowest displacement was observed in the triangular model. The volume of bone susceptible to yielding in the femoral neck region was the lowest for triangular configuration.ConclusionsFor unstable femoral neck fractures, superior results were obtained by stabilizing the fracture with triangular configuration formed by one superior partially threaded screw and two inferior fully threaded screws. This study will require clinical confirmation as to its practicality in the management of unstable femoral fractures.
Highlights
In the present study, we evaluated the mechanical outcome of different configurations formed by fully threaded screws and partially threaded screws in the treatment of unstable femoral neck fracture
Peak stress value of the implants was highest in the model of triangle with posterior single screw
fully threaded cannulated screws (FTS) in each group underwent the most stress while Partially threaded cannulated screws (PTS) underwent a little bit of stress (Table 3 and Fig. 6)
Summary
We evaluated the mechanical outcome of different configurations formed by fully threaded screws and partially threaded screws in the treatment of unstable femoral neck fracture. Femoral neck fractures are relatively common which account for almost 50% of all hip fractures [1]. The treatment recommendations vary depending on the fracture pattern and the patient’s age [2]. Threaded cannulated screws (PTS) have remained a standard method. Fully threaded cannulated screws (FTS) have been raised regarding alternative ways for the fixation of femoral neck fractures and got the satisfied radiographic results and clinical outcome [7, 8]. Li et al Journal of Orthopaedic Surgery and Research (2018) 13:272
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