Modelling heat transfer in a bone–cement–prosthesis system

2003 ◽  
Vol 36 (6) ◽  
pp. 787-795 ◽  
Author(s):  
Eskil Hansen
Keyword(s):  
Heat Transfer ◽  
Bone Cement ◽  
Cement Prosthesis

Investigation of Mechanical Behaviour of the Bone Cement (PMMA) under Combined Shear and Compression Loading

2019 ◽  
Vol 41 ◽  
pp. 37-48 ◽  
Author(s):  
Habib Khellafi ◽  
Mohammed Mokhtar Bouziane ◽  
Abdelkader Djebli ◽  
Abdeldjalil Mankour ◽  
Mustapha Bendouba ◽  
...  
Keyword(s):  
Finite Elements ◽  
Bone Cement ◽  
Mechanical Behaviour ◽  
Orthopedic Surgery ◽  
Mechanical Tests ◽  
Compression Loading ◽  
Loading Direction ◽  
Cement Prosthesis ◽  
Finite Elements Model

Generally, implants fixations in orthopedic surgery are insured by bone cement; which is generated mainly from polymer polymethylmethacrylate (PMMA). Since, the cement is identified as the weakest part among bone-cement-prosthesis assembly. Hence, the characterization of mechanical behaviour is of a crucial requirement for orthopaedic surgeon’s success. In this study, we investigates the failure behaviour of bone cement, under combined shear and compression loading, for the aim to determine the strengths of bone cement for different mode loading conditions. Therefore, experimental cylindrical specimens has been tested to assess different shear-compression stresses. Based on the mechanical tests, a finite elements model of cylindrical specimens was developed to evaluate stresses distribution in the bone cement under compression, shear and combined shear-compression loading. Results show that, the load which leading to the failure of the cement decreased with increasing of the specimen angle inclination with respect of loading direction.

Finite Element Thermal Analysis of Bone Cement for Joint Replacements

2003 ◽  
Vol 125 (3) ◽  
pp. 315-322 ◽  
Author(s):  
Chaodi Li ◽  
Shiva Kotha ◽  
Chen-Hsi Huang ◽  
James Mason ◽  
Don Yakimicki ◽  
...  
Keyword(s):  
Finite Element ◽  
Kinetic Model ◽  
Thermal Behavior ◽  
Bone Cement ◽  
Cement Mantle ◽  
Peak Temperature ◽  
Temperature History ◽  
Cement Interface ◽  
Cement Prosthesis ◽  
Mantle Thickness

A finite element technique was developed to investigate the thermal behavior of bone cement in joint replacement procedures. Thermal tests were designed and performed to provide the parameters in a kinetic model of bone cement exothermic polymerization. The kinetic model was then coupled with an energy balance equation using a finite element formulation to predict the temperature history and polymerization development in the bone-cement-prosthesis system. Based on the temperature history, the possibility of the thermal bone necrosis was then evaluated. As a demonstration, the effect of cement mantle thickness on the thermal behavior of the system was investigated. The temperature profiles in the bone-cement-prosthesis system have shown that the thicker the cement, the higher the peak temperature in the bone. In the 7 mm thick cement case, a peak temperature of over 55°C was predicted. These high temperatures occurred in a small region near the bone/cement interface. No damage was predicted in the 3 mm and 5 mm cement mantle thickness cases. Although thermal damage was predicted in the bone for the 7 mm mantle thickness case, the amount of thermal necrosis predicted was minimal. If more cement is used in the surgical procedure, more heat will be generated and the potential for thermal bone damage may rise. The systems should be carefully selected to reduce thermal tissue damage when more cement is used. The methodology developed in this paper provides a numerical tool for the quantitative simulation of the thermal behavior of bone-cement-prosthesis designs.

Stress Analysis and Failure Prediction in the Proximal Femur Before and After Total Hip Replacement

1986 ◽  
Vol 108 (1) ◽  
pp. 33-41 ◽  
Author(s):  
H. H. Vichnin ◽  
S. C. Batterman
Keyword(s):  
Bone Cement ◽  
Material Properties ◽  
Isotropic Material ◽  
Three Dimensional ◽  
Transversely Isotropic ◽  
Transversely Isotropic Material ◽  
Experimental Conditions ◽  
Failure Data ◽  
Cement Prosthesis ◽  
Failure Loads

An investigation was performed to determine the effects of the presence of two lengths of proximal Mu¨ller prosthesis on predicted failure loads, as compared to those for an intact femur. Three-dimensional stresses in a bone/cement/prosthesis system were determined using finite element methods, with both isotropic and transversely isotropic material properties used for the diaphyseal cortex. Significant increases in prosthesis stem stresses were found when the transversely isotropic material properties were employed in the diaphyseal cortex. This leads to the conclusion that accurate anisotropic material properties for bone are essential for precise stress determination and optimum design in prosthetic implants. Failure loads were also predicted for vertical compression and axial torque, similar to available experimental conditions, and were within the range of the experimental failure data found in the literature. The technique developed herein can be used to systematically assess existing as well as future implant designs, taking into account the complex three-dimensional interaction effects of the overall bone/cement/prosthesis system.

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