Proximal femoral nail anti-rotation versus cementless bipolar hemiarthroplasty for unstable femoral intertrochanteric fracture in the elderly: a retrospective study.

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Abstract

[Indexed for MEDLINE] Conflict of interest statement: The authors declare that they have no competing interests. 9. Zhongguo Gu Shang. 2019 Feb 25;32(2):176-180. doi: 10.3969/j.issn.1003-0034.2019.02.017. [Finite element analysis of InterTan for the treatment of femoral intertrochanteric fractures]. [Article in Chinese] Hao LS(1), Guan T(1), Huang F(1), Chen J(1), Mu SK(1), Zhu GW(2). Author information: (1)Liaocheng Chinese Medicine Hospital, Liaocheng 252000, Shandong, China. (2)Liaocheng Chinese Medicine Hospital, Liaocheng 252000, Shandong, China; hls19860722@163.com. OBJECTIVE: To study the biomechanical characteristics of InterTan for the treatment of femoral intertrochanteric fracture of Evans-Jensen IV. METHODS: Scanning the femur and internal plant of volunteers with spiral CT to obtain DICOM format data. Three-dimensional models of left femur and InterTan were reconstructed by Mimics software. On this basis, a three-dimensional finite element model of internal fixation for Evans-Jensen IV intertrochanteric fracture of femur was established. The stress and microstrain distribution of Von Mses in different models were studied. The biomechanical stability after internal fixation of the Evans Jensen IV femoral intertrochanteric fracture was analyzed. RESULTS: The stress pattern of the femur of InterTan model was the same as that of the normal femur, which was mainly located on the medial side of the proximal femur and the lower third of the femur. However, the stress of femur in InterTan model was lower than that in the same part of normal femur. The peak stress of the femur in the model was 13.92 MPa, located at the end of the inner plant in contact with the femur. The stress peak of the plant in the model was 146.5 MPa at the lower contact point between the tension nail and the main nail. CONCLUSIONS: InterTan fixation has obvious biomechanical advantages and is not easy to cause stress fractures in the middle femur in patients with osteopenic Evans-Jensen IV intertrochanteric fractures. In particular, for patients with greater activity in the intertrochanteric fracture of the Evans-Jensen IV femur, InterTan fixation has better stability and provides a theoretical basis for the choice of internal fixation. Copyright© 2019 by the China Journal of Orthopaedics and Traumatology Press. DOI: 10.3969/j.issn.1003-0034.2019.02.017