BACKGROUND The femoral neck dynamic intersection system(FNS)is mechanically more stable than other internal fixation techniques.Current studies have confirmed that the structural design of FNS has good biomechanical p...BACKGROUND The femoral neck dynamic intersection system(FNS)is mechanically more stable than other internal fixation techniques.Current studies have confirmed that the structural design of FNS has good biomechanical properties in European and American populations.However,whether the suitability of the FNS's 130°main nail angle design for Asian populations has been thoroughly investigated remains unclear.AIM To compare the biomechanical stability differences among different main nail angles of the FNS in the treatment of femoral neck fractures in Asian populations.METHODS Computed tomography data of the femur of healthy adult male volunteers were imported into Mimics software to create a three-dimensional model of the femur.The model was adapted to the curve using Geomagic software and imported into Solidworks software to construct the Pauwels I femoral neck fracture model and design the FNS internal fixation model using different main nail angles.Afterward,the models were assembled with the FNS fracture model and meshed using the preprocessing Hypermesh software.Subsequently,they were imported into Abaqus software to analyze and evaluate the biomechanical effects of different angles of the FNS main nail on the treatment of femoral neck fractures.RESULTS The peak displacement of the proximal femur under different angles of FNS fixation under stress was 7.446 millimeters in the 120°group and 7.416 millimeters in the 125°group;in the 130°,135°,and 140°FNS fixation groups,the peak displacement was 7.324 millimeters,8.138 millimeters,and 8.246 millimeters,respectively.In the 120°and 125°FNS fixation groups,the maximum stresses were concentrated at the main nail and the anti-rotation screw,which intersected the fracture line of the femur neck,resulting in peak stresses of 200.7 MPa and 138.8 MPa,respectively.Peak stresses of 208.8 MPa,219.8 MPa,and 239.3 MPa were observed on the angular locking plate distal to the locking screw in the 130°,135°,and 140°fixation groups.CONCLUSION FNS has significant stress distribution properties,a minimal proximal femoral displacement,and an optimal stability for treating femoral neck fractures in Asian populations when performed with a 130°main nail angle.展开更多
目的探讨一种治疗青壮年股骨颈骨折的方法和临床疗效。方法对25例青壮年PauwelsⅡ、Ⅲ型股骨颈骨折采用解剖型髋动力带锁钢板(anatomical dynamic hip lock plate,ADHLP)加带旋髂深血管髂骨瓣进行治疗。结果随访18～48个月,平均22个月...目的探讨一种治疗青壮年股骨颈骨折的方法和临床疗效。方法对25例青壮年PauwelsⅡ、Ⅲ型股骨颈骨折采用解剖型髋动力带锁钢板(anatomical dynamic hip lock plate,ADHLP)加带旋髂深血管髂骨瓣进行治疗。结果随访18～48个月,平均22个月。全部病例骨折愈合,无股骨头坏死及骨不连,无髋内翻或下肢短缩等。按Harris评分标准评分,优21例,良2例,可2例。结论利用ADHLP加带旋髂深血管髂骨瓣移植重建股骨头血供治疗青壮年PauwelsⅡ、Ⅲ型股骨颈骨折,是预防股骨头坏死及骨不连的一种有效方法。展开更多
基金Supported by Tianjin Science and Technology planning Project,No.21JCQNJC01060Key Project of Tianjin Natural Science Foundation,No.22JCZDJC00340National Key Research and Development Project of China,No.2022YFC3601904.
文摘BACKGROUND The femoral neck dynamic intersection system(FNS)is mechanically more stable than other internal fixation techniques.Current studies have confirmed that the structural design of FNS has good biomechanical properties in European and American populations.However,whether the suitability of the FNS's 130°main nail angle design for Asian populations has been thoroughly investigated remains unclear.AIM To compare the biomechanical stability differences among different main nail angles of the FNS in the treatment of femoral neck fractures in Asian populations.METHODS Computed tomography data of the femur of healthy adult male volunteers were imported into Mimics software to create a three-dimensional model of the femur.The model was adapted to the curve using Geomagic software and imported into Solidworks software to construct the Pauwels I femoral neck fracture model and design the FNS internal fixation model using different main nail angles.Afterward,the models were assembled with the FNS fracture model and meshed using the preprocessing Hypermesh software.Subsequently,they were imported into Abaqus software to analyze and evaluate the biomechanical effects of different angles of the FNS main nail on the treatment of femoral neck fractures.RESULTS The peak displacement of the proximal femur under different angles of FNS fixation under stress was 7.446 millimeters in the 120°group and 7.416 millimeters in the 125°group;in the 130°,135°,and 140°FNS fixation groups,the peak displacement was 7.324 millimeters,8.138 millimeters,and 8.246 millimeters,respectively.In the 120°and 125°FNS fixation groups,the maximum stresses were concentrated at the main nail and the anti-rotation screw,which intersected the fracture line of the femur neck,resulting in peak stresses of 200.7 MPa and 138.8 MPa,respectively.Peak stresses of 208.8 MPa,219.8 MPa,and 239.3 MPa were observed on the angular locking plate distal to the locking screw in the 130°,135°,and 140°fixation groups.CONCLUSION FNS has significant stress distribution properties,a minimal proximal femoral displacement,and an optimal stability for treating femoral neck fractures in Asian populations when performed with a 130°main nail angle.
文摘目的探讨一种治疗青壮年股骨颈骨折的方法和临床疗效。方法对25例青壮年PauwelsⅡ、Ⅲ型股骨颈骨折采用解剖型髋动力带锁钢板(anatomical dynamic hip lock plate,ADHLP)加带旋髂深血管髂骨瓣进行治疗。结果随访18～48个月,平均22个月。全部病例骨折愈合,无股骨头坏死及骨不连,无髋内翻或下肢短缩等。按Harris评分标准评分,优21例,良2例,可2例。结论利用ADHLP加带旋髂深血管髂骨瓣移植重建股骨头血供治疗青壮年PauwelsⅡ、Ⅲ型股骨颈骨折,是预防股骨头坏死及骨不连的一种有效方法。
