title: Evaluation of the 3D finite element method using a tantalum rod for osteonecrosis of the femoral head.
abstract: BACKGROUND
  The aim of this study was to contrast the collapse values of the postoperative weight-bearing areas of different tantalum rod implant positions, fibula implantation, and core decompression model and to investigate the advantages and disadvantages of tantalum rod implantation in different ranges of osteonecrosis in comparison with other methods.
  
  
  METHODS
  The 3D finite element method was used to establish the 3D finite element model of normal upper femur, 3D finite element model after tantalum rod implantation into different positions of the upper femur in different osteonecrosis ranges, and other 3D finite element models for simulating fibula implant and core decompression.
  
  
  RESULTS
  The collapse values in the weight-bearing area of the femoral head of the tantalum rod implant model inside the osteonecrosis area, implant model in the middle of the osteonecrosis area, fibula implant model, and shortening implant model exhibited no statistically significant differences (p>0.05) when the osteonecrosis range was small (60°). The stress values on the artificial bone surface for the tantalum rod implant model inside the osteonecrosis area and the shortening implant model exhibited statistical significance (p<0.01).
  
  
  CONCLUSIONS
  Tantalum rod implantation into the osteonecrosis area can reduce the collapse values in the weight-bearing area when osteonecrosis of the femoral head (ONFH) was in a certain range, thereby obtaining better clinical effects. When ONFH was in a large range (120°), the tantalum rod implantation inside the osteonecrosis area, shortening implant or fibula implant can reduce the collapse values of the femoral head, as assessed by other methods.
authors.affiliation: Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai, China (mainland).
authors.forename: Jingsheng
authors.initials: J
authors.lastname: Shi
authors.affiliation: Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai, China (mainland).
authors.forename: Jie
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai, China (mainland).
authors.forename: Jianguo
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai, China (mainland).
authors.forename: Feiyan
authors.initials: F
authors.lastname: Chen
authors.affiliation: Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai, China (mainland).
authors.forename: Guangyong
authors.initials: G
authors.lastname: Huang
authors.affiliation: Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai, China (mainland).
authors.forename: Zhan
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai, China (mainland).
authors.forename: Guanglei
authors.initials: G
authors.lastname: Zhao
authors.affiliation: Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai, China (mainland).
authors.forename: Yibing
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai, China (mainland).
authors.forename: Siqun
authors.initials: S
authors.lastname: Wang
mesh_terms: D000328:Adult; D005271:Femur Head Necrosis / Q000473:pathology* / Q000503:physiopathology; D020342:Finite Element Analysis; D006801:Humans; D008297:Male; D019736:Prostheses and Implants; D013314:Stress, Mechanical; D013635:Tantalum / Q000494:pharmacology*; D016474:Weight-Bearing
chemical_list: D013635:Tantalum