Acetabular metal backed fatigue due to severe wear before revision

Griza, Sandro; Ce, Aun; Silva, E.P.; Bertoni, Fabiano; Reguly, Afonso; Strohaecker, Telmo Roberto

doi:10.1016/j.engfailanal.2009.01.004

Cited by 6 publications

(7 citation statements)

References 29 publications

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“…The SS is used as the metal backing shell material due to its high strength. Finally, the pelvis, which is assumed as a hemispherical shape, is represented as a cancellous bone [14]. The materials of the hip joint components are assumed to be homogenous, isotropic and linearly elastic.…”

Section: Resultsmentioning

confidence: 99%

“…The dimensions of femur heads, UHMWPE cups and metal backing shell are tabulated in Table 1 [30]. The pelvis is assumed to have a hemispherical shape with 42 mm thickness of cancellous bone [14]. Figure 2 schematically shows the hip joint model consisting of femur head, UHMWPE cup, different metal backing shells, and finally the pelvis bone.…”

Section: Finite Element Modelmentioning

confidence: 99%

“…In some hip joint designs, and in order to stiffen up the UHMWPE cup and get a more even distribution of contact stresses over the entire surface of UHMWPE cup, metal backing shell has been inserted between the cup and pelvic bone. Also, this metal backing can help in avoiding the loosening of the artificial acetabulum that may be caused by the creep of UHMWPE cup [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The loosening due to the wear of polymeric cup has been considered as one of the main factors that affects the long-term stability of the total hip arthroplasty. It is believed that the production of wear debris may induce adverse tissue reaction that may lead to extensive bone loss around the implant and consequently osteolysis and implant loosening [7,14,17].…”

Section: Introductionmentioning

confidence: 99%

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Finite element study on the predicted equivalent stresses in the artificial hip joint

Monif¹

2012

JBiSE

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The subsurface fatigue that occurs in the Ultra-High Molecular Weight Polyethylene (UHMWPE) hip joint cup has been identified to be correlated with the contact stress at that cup. This cup stress is known to be affected by the implant design, dimensions and materials. In this study, a 3D finite element modeling has been used to investigate the effects on the cup contact stress when using low stiffness Titanium alloy (Ti) as a femur head. Also, the effects on the cup contact stress due to using different sizes of femur heads, and the presence of metal backing shell with different thicknesses are studied. The finite element results show that the use of low stiffness Ti alloy femur head results in a significant decrease in the cup contact stress compared with Stainless Steel (SS) and Cobalt Chromium (Co Cr Mo) femur heads. The presence of metal backing shell up to 1 mm thickness results in a remarkable decrease in the cup contact stresses especially for small femur heads. Finally, the use of larger femur heads, up to 32 mm diameter, results in significant decrease in the overall predicted hip joint contact. The present results indicate that any changes in design and geometrical parameters of the hip joint have significant consequences in the long term behaviour of the artificial hip joint and should be taken into consideration

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Section: Resultsmentioning

confidence: 99%

Section: Finite Element Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Finite element study on the predicted equivalent stresses in the artificial hip joint

Monif¹

2012

JBiSE

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“…Με την ραγδαία βελτίωση των υπολογιστικών συστημάτων τα τελευταία χρόνια εντάθηκαν οι προσπάθειες για την καλύτερη τεκμηρίωση των μοντέλων σε σύγκριση με την πραγματική κατάσταση (Completo et al, 2007). (Bennett et al, 2008, Garcia-Rey et al, 2008 To 2009 υπάρχουν ήδη αναφορές για τα εμφυτεύματα press fit (Gebert et al, 2009) και την μηχανική τους ευστάθεια, για την φθορά της κοτυλιαίας πρόθεσης (Griza et al, 2009) και άλλα. Αξίζει τέλος να αναφερθούμε και σε μια πολύ πρόσφατη δημοσίευση των Είναι ιδιαίτερα πολύπλοκη άρθρωση και για τον λόγο αυτό είναι απαραίτητη μια συνοπτική περιγραφή της ανατομίας της (Snell R., 1992; Alan S., Lowe J., 1998;Sobotta J., 1998;Martin et al, 1998;Moore K., 1998;Cameron et al, 2001…”

Section: -2009unclassified

Ανάλυση Μηχανικής Συμπεριφοράς Οστών - Εμφυτευμάτων Με Χρήση Πεπερασμένων Στοιχείων

Θεοδώρου¹,

Theodorou²

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Απαγορεύεται η αντιγραφή, αποθήκευση και διανομή της παρούσας εργασίας, εξ ολοκλήρου ή τμήματος αυτής, για εμπορικό σκοπό. Επιτρέπεται η ανατύπωση, αποθήκευση και διανομή για σκοπό μη κερδοσκοπικό, εκπαιδευτικής ή ερευνητικής φύσης, υπό την προϋπόθεση να αναφέρεται η πηγή προέλευσης και να διατηρείται το παρόν μήνυμα. Ερωτήματα που αφορούν τη χρήση της εργασίας για κερδοσκοπικό σκοπό πρέπει να απευθύνονται προς τον συγγραφέα.Οι απόψεις και τα συμπεράσματα που περιέχονται σε αυτό το σύγγραμμα εκφράζουν τον συγγραφέα και δεν πρέπει να ερμηνευθεί ότι αντιπροσωπεύουν τις επίσημες θέσεις του Εθνικού Μετσόβιου Πολυτεχνείου.

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In vitro evaluation of stiffness graded artificial hip joint femur head in terms of joint stresses distributions and dimensions: finite element study

Fouad

2011

J Mater Sci: Mater Med

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The aim of the present work is to evaluate the artificial hip joint femur head that is made of Stiffness Graded (SG) material in terms of joint stresses distributions and dimensions. In this study, 3D finite element models of femur head that is made of SG material and traditional femur heads made of Stainless Steel (SS), Cobalt Chromium alloy (Co Cr Mo) and Titanium alloy (Ti) have been developed using the ANSYS Code. The effects on the total artificial hip joint system stresses due to using the proposed SG material femur head (with low stiffness at the outer surface and high stiffness at its core) have been investigated. Also, the effects on the polymeric cup contact stresses due to the use of different sizes of femur heads, presence of metal backing shell and presence of radial clearance (gap) between cup and femur head have been investigated. The finite element results showed that using SG femur head resulted in a significant reduction in the cup contact stresses even for small femur heads compared with Ti alloy, SS and Co Cr Mo femur heads. The presence of radial clearance resulted in significant increase in the cup stresses especially for small femur heads. Finally, the presence of SS metal backing shell resulted in slight increase in the hip joint stresses especially for small femur head joints. This work analyzes successfully the usage of proposed SG material as femur head in order to reduce the predicted stresses at the total hip joint replacement due to the redistribution of strain energy in the hip prostheses. Therefore, the present results suggest that minor changes in design and geometrical parameters of the hip joint have significant consequences on the long term use of the joint and should be taken into consideration during the design of the hip joint.

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Acetabular metal backed fatigue due to severe wear before revision

Cited by 6 publications

References 29 publications

Finite element study on the predicted equivalent stresses in the artificial hip joint

Finite element study on the predicted equivalent stresses in the artificial hip joint

Ανάλυση Μηχανικής Συμπεριφοράς Οστών - Εμφυτευμάτων Με Χρήση Πεπερασμένων Στοιχείων

In vitro evaluation of stiffness graded artificial hip joint femur head in terms of joint stresses distributions and dimensions: finite element study

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