Aim: The unique shape and vascularization make capitellar fractures challenging to treat. In such cases, screw inclination is crucial
to achieve stable fixation. In the present study, we aimed to evaluate the mechanical outcome of the different fixation angles formed
by headless cannulated screws for treatment of type 1 capitellum fracture and compared interfragmentary displacement (IFD) using
finite element analysis (FEA).
Material and Methods: In our study, three-dimensional finite element stress analysis was applied using the isotropic materials and
static linear analysis. Stochastic screw inclination scenarios (Case 1, Case 2, Case 3, and Case 4) were generated, and perpendicular
application of loads were simulated with magnitudes between 50 and 300 N on the elbow at angulations from 0º to 145º. The IFD in
the four different screw inclination pairs were listed in the ANSYS general end processor. Relative IFD was calculated by measuring
the total displacements in the X/Y/Z planes from 16 different points.
Results: According to the modeling, the magnitude of IFD was significantly different in terms of the force and the case factors
under four altered forces. Analysis of displacement exhibited a significant difference in the force values of ‘100N/200N/300N’ and
in the screw inclinations of Case 2 only. Although the interaction effect between the Force*Case was observed to be low, the most
noticeable results were obtained from the “300N*Case 2.” pair compared to the others (p<0.05).
Conclusion: Screws used for fracture fixation must maintain an anatomical correction, until it heals. Following a complex trauma
such as a capitellar fracture, the elbow joint needs a stable fixation and early mobilization