Modified F configuration in the treatment of Pauwels type III femoral neck fracture: a finite element analysis

BMC Musculoskeletal Disorders

Gang Wang¹  Jie Shang²  Rong Peng²  Biao Wu²  Baizhou Xing²  Hua-Ding Lu²  Shiyuan Lin³ 

[1] Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China;Department of Orthopaedics, The Fifth Affiliated Hospital of Sun Yat-Sen University, No. 52, Meihua East Road, 519000, Zhuhai, Guangdong Province, China;Department of Orthopaedics, The Fifth Affiliated Hospital of Sun Yat-Sen University, No. 52, Meihua East Road, 519000, Zhuhai, Guangdong Province, China;Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China;

关键词: F-technique;    Femoral neck fracture;    Finite element analysis;    Internal fixation;    Pauwels type III;   

DOI  :  10.1186/s12891-021-04638-2

来源: Springer

【 摘 要 】

BackgroundThe optimal treatment of Pauwels type III femoral neck fracture (FNF) in young patients remains a worldwide challenge in orthopedic surgery.MethodsFinite element models of four internal fixations were developed to treat Pauwels type III FNF: a: the traditional inverted triangular parallel cannulated screw (PCS) model, b: the F-technique cannulated screw model, c: the modified F-technique cannulated screw model using a fully threaded screw instead of a partially threaded distally, d: the dynamic hip screw coupled with derotational screw (DHS + DS) model. Under the same conditions, finite element analyses were carried out to compare the displacement and von Mises stress distribution of four internal fixations and femurs, the maximum crack distances of the fracture surfaces, Z axis displacements of four models as well as the stress distribution in the subtrochanteric region.ResultsThe modified F-technique configuration resulted in a more stable fixation as compared to the other three configurations, with respect to the maximum displacement and stress peaks of femur and internal fixations, the maximum crack distances of the fracture surfaces, Z axis displacements of four configurations as well as the stress distribution in the subtrochanteric region.ConclusionsOur results suggested that modified F-technique configuration show a better performance in resisting shearing and rotational forces in treating Pauwels type III FNF compared to those using traditional inverted triangular PCS, the F-technique configuration or DHS + DS, providing a new choice for the treatment of FNFs.

【 授权许可】

CC BY