PDF(Pubmed)
Abstract：
UNASSIGNED: Conventional cephalomedullary nails (CMNs) are commonly employed for internal fixation in the treatment of reverse obliquity intertrochanteric (ROI) fractures. However, the limited effectiveness of conventional CMNs in addressing ROI fractures results in significant implant-related complications. To address challenges associated with internal fixation, a novel Proximal Femoral Bionic Nail (PFBN) has been developed.
UNASSIGNED: In this study, a finite element model was constructed using a normal femoral specimen, and biomechanical verification was conducted using the GOM non-contact optical strain measurement system. Four intramedullary fixation approaches-PFBN, Proximal Femoral Nail Antirotation InterTan nail (ITN), and Gamma nail (Gamma nail)-were employed to address three variations of ROI fractures (AO/OTA 31-A3). The biomechanical stability of the implant models was evaluated through the calculation of the von Mises stress contact pressure and displacement.
UNASSIGNED: Compared to conventional CMNs, the PFBN group demonstrated a 9.36%-59.32% reduction in the maximum VMS at the implant. The A3.3 ROI fracture (75% bone density) was the most unstable type of fracture. In comparison to conventional CMNs, PFBN demonstrated more stable data, including VMS values (implant: 506.33 MPa, proximal fracture fragment: 34.41 MPa), contact pressure (13.28 MPa), and displacement (17.59 mm).
UNASSIGNED: Compared to the PFNA, ITN, and GN, the PFBN exhibits improvements in stress concentration, stress conduction, and overall model stability in ROI fractures. The double triangle structure aligns better with the tissue structure and biomechanical properties of the proximal femur. Consequently, the PFBN has significant potential as a new fixation strategy for the clinical treatment of ROI fractures.
UNASSIGNED: In this study, a finite element model was constructed using a normal femoral specimen, and biomechanical verification was conducted using the GOM non-contact optical strain measurement system. Four intramedullary fixation approaches-PFBN, Proximal Femoral Nail Antirotation InterTan nail (ITN), and Gamma nail (Gamma nail)-were employed to address three variations of ROI fractures (AO/OTA 31-A3). The biomechanical stability of the implant models was evaluated through the calculation of the von Mises stress contact pressure and displacement.
UNASSIGNED: Compared to conventional CMNs, the PFBN group demonstrated a 9.36%-59.32% reduction in the maximum VMS at the implant. The A3.3 ROI fracture (75% bone density) was the most unstable type of fracture. In comparison to conventional CMNs, PFBN demonstrated more stable data, including VMS values (implant: 506.33 MPa, proximal fracture fragment: 34.41 MPa), contact pressure (13.28 MPa), and displacement (17.59 mm).
UNASSIGNED: Compared to the PFNA, ITN, and GN, the PFBN exhibits improvements in stress concentration, stress conduction, and overall model stability in ROI fractures. The double triangle structure aligns better with the tissue structure and biomechanical properties of the proximal femur. Consequently, the PFBN has significant potential as a new fixation strategy for the clinical treatment of ROI fractures.
摘要：
■常规的头髓内钉（CMNs）通常用于内固定治疗股骨转子间反向倾斜（ROI）骨折。然而,常规CMNs在治疗ROI骨折方面的效果有限,会导致显著的植入物相关并发症.为了应对与内固定相关的挑战，一种新型股骨近端仿生钉（PFBN）已被开发出来。
■在这项研究中，使用正常股骨标本构建有限元模型，并利用GOM非接触式光学应变测量系统进行了生物力学验证。四种髓内固定方法-PFBN，股骨近端防旋InterTan钉(ITN),和Gamma钉（Gamma钉）-用于解决ROI骨折的三个变化（AO/OTA31-A3）。通过计算vonMises应力接触压力和位移来评估植入物模型的生物力学稳定性。
■与传统CMN相比，PFBN组显示植入物处的最大VMS减少9.36%-59.32%。A3.3ROI骨折（75％骨密度）是最不稳定的骨折类型。与传统的CMN相比，PFBN表现出更稳定的数据，包括VMS值(植入物:506.33MPa,近端骨折碎片：34.41MPa），接触压力(13.28MPa),和位移（17.59毫米）。
■与PFNA相比，ITN,GN,PFBN表现出应力集中的改善，应力传导，和ROI骨折的整体模型稳定性。双三角形结构与股骨近端的组织结构和生物力学特性更好地对齐。因此,PFBN作为临床治疗ROI骨折的新的固定策略具有重要的潜力。
■在这项研究中，使用正常股骨标本构建有限元模型，并利用GOM非接触式光学应变测量系统进行了生物力学验证。四种髓内固定方法-PFBN，股骨近端防旋InterTan钉(ITN),和Gamma钉（Gamma钉）-用于解决ROI骨折的三个变化（AO/OTA31-A3）。通过计算vonMises应力接触压力和位移来评估植入物模型的生物力学稳定性。
■与传统CMN相比，PFBN组显示植入物处的最大VMS减少9.36%-59.32%。A3.3ROI骨折（75％骨密度）是最不稳定的骨折类型。与传统的CMN相比，PFBN表现出更稳定的数据，包括VMS值(植入物:506.33MPa,近端骨折碎片：34.41MPa），接触压力(13.28MPa),和位移（17.59毫米）。
■与PFNA相比，ITN,GN,PFBN表现出应力集中的改善，应力传导，和ROI骨折的整体模型稳定性。双三角形结构与股骨近端的组织结构和生物力学特性更好地对齐。因此,PFBN作为临床治疗ROI骨折的新的固定策略具有重要的潜力。
