Finite Element Analysis of Bone Remodeling after Hip Resurfacing Arthroplasty

Author(s):  
Bernd-Arno Behrens ◽  
Ingo Nolte ◽  
Patrick Wefstaedt ◽  
Christina Stukenborg-Colsman ◽  
Anas Bouguecha
Author(s):  
Danny Vogel ◽  
Martin Liebelt ◽  
Florian Kalkowsky ◽  
Thomas Oberbach ◽  
Daniel Delfosse ◽  
...  

Hip resurfacing arthroplasty may have distinct advantages for young and active patients, but large metal-on-metal bearings can be associated with increased wear, adverse tissue reactions and higher rate of implant loosening. Ceramic wear couples are a commonly used alternative to metals and therefore might be an alternative for hip resurfacing arthroplastys. The aim of this study was to evaluate the mechanical strength of femoral components made of an alumina-toughened zirconia composite by means of experimental testing and finite element analysis. For the mechanical characterization, ceramic femoral components (Ø: 48 mm) were tested under compression loading experimentally until fracture occurred or a maximum load of 85 kN was obtained. The femoral components were either loaded against a ceramic cup or a copper ring (outer diameter Ø: 7.0 mm). In addition, the complex geometry of the ceramic femoral component was simplified, and only the stem was loaded in a cantilever test until fracture. In addition, the fracture tests were numerically simulated to investigate the influence of additional loading conditions and geometric parameters, which were not experimentally tested. The experimental data were used for validation of the finite element analysis. None of the tested ceramic femoral components fractured at a compression load of 85 kN when they were loaded against a ceramic cup at an inclination angle of 45°. When the femoral components were loaded against a copper ring, the femoral components fractured at 29.9 kN at a testing angle of 45°. The fracture load was reduced when an angle of 30° and increased when an angle of 60° was simulated. Using an experimental cantilever test, the stem of the femoral component fractured at 1124.0 N. When the stem length was increased or the diameter was reduced by 10% in the finite element analysis, the fracture load was reduced. Decreasing the length or increasing the diameter led to an increase of the fracture load. The strongest influence was found for the reduction of the transition radius of the stem, with a decrease of the fracture load up to 27.2%. The analyzed femoral components made of alumina-toughened zirconia (ATZ) showed sufficient mechanical capability to withstand high loadings during unfavorable loading conditions. However, further biomechanical and tribological investigations are required before clinical application.


2014 ◽  
Vol 47 (14) ◽  
pp. 3509-3516 ◽  
Author(s):  
F. Schmidutz ◽  
Y. Agarwal ◽  
P.E. Müller ◽  
B. Gueorguiev ◽  
R.G. Richards ◽  
...  

2019 ◽  
Vol 19 (05) ◽  
pp. 1950042
Author(s):  
WEN-HSIANG CHOU ◽  
CHIEN-WEI LIU

Hip resurfacing arthroplasty (HRA) is a long-established procedure. It is a minimally invasive surgery where the surgical wound is relatively small to facilitate a shorter recovery period. HRA remained a popular option among the patients allowing better range of motion of the joint compared to that of total hip arthroplasty (THA). Although HRA is associated with the above advantages, complications involving femoral neck fractures after surgery still occur. Therefore, the present study attempts to assess the impact of stress under various alignment conditions and different scenarios in surgical errors upon the femoral neck in hip resurfacing prostheses (HRP) that may be encountered during the procedure using finite element analysis (FEA) technique. The results showed that anteversion implantation errors on femoral components should be avoided, and that the main reason that causes femoral neck fracture is related to the stress shielding effect generated internally in the femoral neck. Methods to prevent the incidence of such events are a major obstacle to be solved in the future.


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