Novel Retrograde Intramedullary Nail on Medial Femur Condyle for Internal Fixation of Distal Femur Type A Fracture:A Finite Element Analysis
10.16156/j.1004-7220.2025.04.018
- VernacularTitle:新型股骨内髁逆行髓内针内固定治疗股骨远端A型骨折的有限元分析
- Author:
Weimin LIN
1
;
Xiaolong LIN
;
Yingying WANG
;
Jun LIN
;
Weizhong GUO
;
Chengshou LIN
;
Wang LIN
Author Information
1. 福建医科大学附属闽东医院骨科,福建福安 355099
- Publication Type:Journal Article
- Keywords:
distal femur fracture;
medial femur condyle;
retrograde intramedullary nail;
finite element analysis
- From:
Journal of Medical Biomechanics
2025;40(4):922-929
- CountryChina
- Language:Chinese
-
Abstract:
Objective To compare the biomechanical characteristics of novel retrograde intramedullary nail,common femoral retrograde intramedullary nail,and medial femoral condyle locking plate for treating distal femur type A fractures by finite element analysis,and study the advantages of retrograde intramedullary nail on medial femoral condyle.Methods A novel retrograde intramedullary nail on medial femur condyle was designed.CT scan was performed on lower limb bones of a male volunteer,and a three-dimensional(3D)model of the femur was established.The model was then segmented to create models of distal femur type A2 and A3 fractures.The 3D models of internal fixator were established.The small and standard retrograde intramedullary nail on medial femoral condyle,common femoral retrograde intramedullary nail,locking plate on medial femoral condyle were used for internal fixation on A2 type fracture.A3 type fracture was fixed with one of the above internal fixators combined with lateral condylar plate respectively.The 600 N axial load and 4 N·m torsional load were applied to the models.The displacement and stress of femurs,the displacement and stress of internal fixators,the micro-momentum between the internal fixator and the bone,the relative displacement of the two fracture broken ends were observed in each group.Results Among the A2 and A3 type fractures under axial loads,the correponding standard group and corresponding standard combined group had the smallest peak displacement and peak stress of internal fixation.Among the A2 and A3 type fractures under torsional loads,the correponding standard group and corresponding standard combined group had the smallest peak displacement of the femur and internal fixation.The relative displacement of the two broken ends in the standard combined group was the smallest.Conclusions Compared with femoral medial condylar locking plate and common retrograde intramedullary nail,this novel retrograde intramedullary nail on medial femur condyle has a mechanical advantage of reducing stress concentration and reducing the risk of internal fixation failure,and it can be used alone for distal femur type A2 fracture,or in combination with the lateral condylar plate to fix distal femur type A3 fracture.
