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STRESS ANALYSIS OF POROUS INGROWTH HIP …

A femoral hip prosthesis is provided with porous bony ingrowth material on each of the anterior and posterior sides

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30/01/2017 · Porous-coated hip replacement

AB - Three different interface geometries for porous ingrowth surface replacements of the hip were examined using two-dimensional linear and non-linear contact finite element analyses. The results indicate that incorporation of a nearly flat prosthesis interface between the surface replacement and the underlying cancellous bone may reduce stress shielding and improve stress transfer from the component. For all designs analyzed, the bone stress shielding was insensitive to component material stiffness when the elastic modulus was > 30 MPa. The use of titanium instead of cobalt-chrome (Co-Cr) as the prosthesis material therefore had a negligible effect on stress shielding.

The factors governing bone ingrowth, stress shielding, and clinical results

Tricalcium phosphate (TCP) is an osteoconductive bioceramic which, when applied to a porous-coated prosthesis, may enhance osseous ingrowth and mechanical stability. It is shown that plasma-sprayed TCP enhances osseous ingrowth into porous-coated devices. However, our data further suggest that enhanced ingrowth may not always lead to enhanced fixation.

The porous-coated anatomic total hip prosthesis: 11- …

Tricalcium phosphate (TCP) is an osteoconductive bioceramic which, when applied to a porous-coated prosthesis, may enhance osseous ingrowth and mechanical stability.

AB - Tricalcium phosphate (TCP) is an osteoconductive bioceramic which, when applied to a porous-coated prosthesis, may enhance osseous ingrowth and mechanical stability. It is shown that plasma-sprayed TCP enhances osseous ingrowth into porous-coated devices. However, our data further suggest that enhanced ingrowth may not always lead to enhanced fixation.

We examined three new interfaces for porous ingrowth hip surface replacements using linear and nonlinear contact finite element analysis. The results indicate that a flatter interface than is usually used, similar to the epiphyseal line, may improve surface replacement longevity. In addition we find that linear analysis of the pressure at the prosthesis-bone interface gives significantly different results than does an analysis which models the interface as a slip surface. This means that the stress patterns at the interface immediately post-implantation, before bony ingrowth occurs, can not be accurately determined from a simple linear analysis.

Porous ingrowth fixation of the femoral component in …

15-09-1999 · DE3000114A: 4536894: Hip prosthesis with flared porous bony ingrowth pads: 4743262: Acetabular cup prosthesis: 4854496: Porous metal coated implant and method for producing same

N2 - Three different interface geometries for porous ingrowth surface replacements of the hip were examined using two-dimensional linear and non-linear contact finite element analyses. The results indicate that incorporation of a nearly flat prosthesis interface between the surface replacement and the underlying cancellous bone may reduce stress shielding and improve stress transfer from the component. For all designs analyzed, the bone stress shielding was insensitive to component material stiffness when the elastic modulus was > 30 MPa. The use of titanium instead of cobalt-chrome (Co-Cr) as the prosthesis material therefore had a negligible effect on stress shielding.

Three different interface geometries for porous ingrowth surface replacements of the hip were examined using two-dimensional linear and non-linear contact finite element analyses. The results indicate that incorporation of a nearly flat prosthesis interface between the surface replacement and the underlying cancellous bone may reduce stress shielding and improve stress transfer from the component. For all designs analyzed, the bone stress shielding was insensitive to component material stiffness when the elastic modulus was > 30 MPa. The use of titanium instead of cobalt-chrome (Co-Cr) as the prosthesis material therefore had a negligible effect on stress shielding.

BACKGROUND: Bone ingrowth into a cementless prosthesis can be achieved by both porous and hydroxyapatite coatings
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  • Early aseptic loosening of a porous tantalum knee prosthesis

    Porous-coated hip replacement

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Total Hip Replacement - OrthoInfo - AAOS

The majority of the currently available Ti and Tialloy implants in clinical application are dense (,).Although certain methods, such as surface treatment, can be appliedto increase the contact area, these methods produce certain effectson bone integration between implants and bone. However, the bonetissue can only extend to the implant surface field and not theinterior of implants ().Biological fixation is not achieved when long-term stability is notguaranteed (). Given thedifference in mechanical properties, the dense-type alloy causesstress shelter after implantation in the body, which eventuallyleads to bone resorption. Numerous studies have indicated thatexcess bone loss influences the long-term effect of implants andleads to implant displacement, aseptic loosening, fracture aroundthe prosthesis and increase in the difficulty of revision surgery(–). To improve the binding capacitybetween interface of bone and implant, the concept ofmicrotechnology was gradually introduced in recent years (). Although several porous alloys are nowavailable in the medical field, porous Ti-Nb alloy is a relativelycost-effective, which is also nontoxic and has good machinabilityand mechanical strength compared with other porous alloys (,). Theporous Ti-Nb alloy used in the present study has a high strengthwith the elastic modulus body close to human cortical bone, whichhas been verified in our previous study (). The degree of bone ingrowth of porousmaterials depends on several factors, including the porosity, theextent of micromotion and stability between implant and bone, andwhether cortical or cancellous bone is contacted with the implantand the size of the gap between the implant and bone (,).

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[origin: ] A vascular prosthesis is constructed from a structure having interconnected, helically oriented channel-porosity to allow oriented ingrowth of connective tissue into a wall of the prosthesis. The prosthesis can have a small internal diameter of 6 mm or less. Several different methods can be used to produce the prosthesis, including a fiber winding and extraction technique, a melt extrusion technique, and a particle and fiber extraction technique using either a layered method or a continuous method. Furthermore, mechanical properties of the prosthesis are matched with mechanical properties of the host vessel, thereby overcoming problems of compliance mismatch.

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Biological fixation refers to the process where bone grows into microscopic pores on a roughened metal surface. The interdigitation of bone into the metal locks the two together firmly and theoretically, this fixation can be permanent. Joint replacement implants, which are usually made of titanium, have taken advantage of biological fixation for many years and its success in total hip replacement is very well established. As long as the implant is stable when first inserted and there is no micromotion between the prosthesis and bone, ingrowth of bone into the metal is quite reliable and generally solid within 6 weeks.

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