BACKGROUND: The aim of this paper was to design a finite element model for a hinged PROSPON oncological knee endoprosthesis and to verify the model by comparison with ankle flexion angle using knee-bending experimental data obtained previously. METHOD: Visible Human Project CT scans were used to create a general lower extremity bones model and to compose a 3D CAD knee joint model to which muscles and ligaments were added. Into the assembly the designed finite element PROSPON prosthesis model was integrated and an analysis focused on the PEEK-OPTIMA hinge pin bushing stress state was carried out. To confirm the stress state analysis results, contact pressure was investigated. The analysis was performed in the knee-bending position within 15.4-69.4° hip joint flexion range. RESULTS: The results showed that the maximum stress achieved during the analysis (46.6 MPa) did not exceed the yield strength of the material (90 MPa); the condition of plastic stability was therefore met. The stress state analysis results were confirmed by the distribution of contact pressure during knee-bending. CONCLUSION: The applicability of our designed finite element model for the real implant behaviour prediction was proven on the basis of good correlation of the analytical and experimental ankle flexion angle data.

• MeSH
• algoritmy MeSH
• analýza metodou konečných prvků MeSH
• analýza selhání vybavení MeSH
• biologické modely * MeSH
• design s pomocí počítače MeSH
• kolenní kloub patofyziologie   MeSH
• kosterní svaly patofyziologie   MeSH
• lidé MeSH
• mechanický stres MeSH
• modul pružnosti MeSH
• nádory kostí patofyziologie   chirurgie   MeSH
• pevnost v tahu MeSH
• pevnost v tlaku MeSH
• počítačová simulace MeSH
• protetické vybavení metody   MeSH
• protézy - design MeSH
• protézy kolene * MeSH
• šlachy patofyziologie   MeSH
• software MeSH
• svalová kontrakce MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• validační studie MeSH

• MeSH
• analýza metodou konečných prvků * MeSH
• anatomické modely MeSH
• kolenní kloub anatomie a histologie   fyziologie   MeSH
• lidé MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

This paper deals with a knee joint endoprosthesis finite element analysis. Based on a three dimensional geometric model of a lower extremity, a mechanical axis of the limb was designed. This axis is important for several reasons. Firstly, the endoprosthesis was positioned due to its direction, secondly, boundary conditions was defined on its proximal and distal end and finally, the axis enabled reasonable simplification of the model which led to the time saving analysis while preserving principal features of the model like the natural boundary conditions or knee joint's degrees of freedom . Having this, one leg stance was simulated. Results of the analysis were encouraging for future models. Especially the choice of the mechanical axis was suitable and enabled a better distribution of contact pressures and stress on both femoral and tibial component compared to our former models. Also their magnitudes correspond better the manufacturer's experience and our findings. The stresses did not exceeded 30MPa for the UHMWPE tibial plateau and 100MPa for the femoral component. The contact pressures were lower than 40MPa.

• MeSH
• biologické modely MeSH
• femur anatomie a histologie   patofyziologie   MeSH
• financování organizované MeSH
• kolenní kloub anatomie a histologie   patofyziologie   MeSH
• lidé MeSH
• mechanický stres MeSH
• protézy kolene MeSH
• rozsah kloubních pohybů MeSH
• tibie anatomie a histologie   patofyziologie   MeSH
• tlak MeSH
• zatížení muskuloskeletálního systému MeSH
• Check Tag
• lidé MeSH