Stemmed femoral knee prostheses

Lenthe, G. Harry van; Willems, Marieke M M; Malefijt, M.C. de Waal; Huiskes, R.

doi:10.3109/17453670209178027

Cited by 31 publications

(10 citation statements)

References 30 publications

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“…Based on initial investigations, an optimum distance of 242mm from the distal most point on the condyles was selected. This manner of fixation is consistent with numerous previous FE [21,23,37,[39][40][41][42] and experimental investigations [20,36,40,43]. In addition by reducing the overall geometrical size of the model by half, a higher resolution mesh could then be applied without significant increase in computational run time.…”

Section: Materials Properties Loading and Boundary Conditionssupporting

confidence: 86%

“…Prosthesis induced stress-shielding is commonly observed following implantation [23,42,[48][49][50][51], with the pattern and severity of bone loss differing with different implant types and fixation [23,24,39,42]. While the long stemmed implant investigated here exhibited the lowest levels of motion and was found to be least sensitive to surgical cut errors, the presence of a long diaphyseal engaging stem may lead to greater bone loss over time in comparison to a stemless implant [21,23]. Should sufficient loosening of the implant occur distally due to prosthesis induced bone loss at the interface, then the majority of the joint reaction force would be transmitted solely through the prosthesis [37].…”

Section: Discussionmentioning

confidence: 99%

“…It is recognised that fixation method (cemented or uncemented) and implant configuration (e.g. stemmed or stemless) can exert a large influence on the global motions between bone and implant [20][21][22][23]. Recent studies have suggested that implant design features such as size and placement of distal femoral pegs [24], anterioposterior slope of the femoral component [25], and angle of fit of the implant [26], may also play a role in the long term survival of the prosthesis.…”

Section: Introductionmentioning

confidence: 99%

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Computational modelling of motion at the bone–implant interface after total knee arthroplasty: The role of implant design and surgical fit

2017

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Section: Materials Properties Loading and Boundary Conditionssupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Computational modelling of motion at the bone–implant interface after total knee arthroplasty: The role of implant design and surgical fit

2017

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“…[1] Microporous titanium provides two additional advantages for implant applications: first, it reduces the stiffness of the material, thus reducing stress shielding, [2,3] and, second, it improves implant anchorage by allowing bone ingrowth. [4][5][6] To date, powder metallurgy approaches have been widely used to create porous Ti structures, through partial sintering, [7][8][9] inclusion of pore formers, [10][11][12][13] expansion of pores pressurized with argon or hydrogen gas, [14,15] or replication of cellular polymers.…”

mentioning

confidence: 99%

Microstructure and Mechanical Properties of Reticulated Titanium Scrolls

et al. 2011

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Titanium and its alloys find widespread use in skeletal implants and biomedical devices (e.g., stents and orthodontic applications) owing to their excellent corrosion resistance, bio-compatibility, static and fatigue strength, and lack of magnetism (an important property for magnetic imaging). [1] Microporous titanium provides two additional advantages for implant applications: first, it reduces the stiffness of the material, thus reducing stress shielding, [2,3] and, second, it improves implant anchorage by allowing bone ingrowth. [4][5][6] To date, powder metallurgy approaches have been widely used to create porous Ti structures, through partial sintering, [7][8][9] inclusion of pore formers, [10][11][12][13] expansion of pores pressurized with argon or hydrogen gas, [14,15] or replication of cellular polymers. [16,17] Embrittlement often arises during processing due to the strong chemical affinity of titanium at elevated temperature with atmospheric oxygen, carbon, and nitrogen. Alternate efforts have focused on producing microarchitectured titanium, composed of lattice or truss structures with struts arranged periodically in space. These structures exhibit an outstanding combination of low density, high strength and stiffness, and good damage tolerance. [18] To date, production methods for microarchitectured titanium have focused on replication precision casting, [19,20] sintering of stacked wire arrays, [21] as well as selective electron beam, [22][23][24] or laser [25] sintering of Ti powders.Recently, we introduced a new method for creating 3D microarchitectured Ti structures that combines: [26] (i) direct ink writing (DIW) of planar lattices composed of two layers of orthogonally oriented, patterned TiH 2 filament arrays, followed by (ii) rolling of these pliable lattices into scrolls, or folding into complex three-dimensional shapes, and finally (iii) heat-treating to reduce the hydride to metallic titanium. This new method is characterized by its simplicity, high shape versatility, and ability to control local geometry, as well as scalability to larger structures. [26] Here, we use this novel COMMUNICATION[*] Prof.

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“…For the evaluation of THAs, the periprosthetic bone was studied by the analysis of the 7 Region of Interests (ROI) around the stem according to Gruen (31) (Figures 3, 4). In case of rTKAs 8 ROI were evaluated (32)(33)(34) (Figures 5, 6). …”

Section: Methodsmentioning

confidence: 99%

Densitometric evaluation of bone-prosthetic counterface in hip and knee arthroplasty with modern implants

Lepri

Giorgini

Signorini

et al. 2016

ccmbm

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SummaryIntroduction. Recent acquisitions of the complex mechanisms of osseointegration between implants and host bone have gained attention, accordingly to the methods of evaluation of these interactions. DEXA analysis is considered an useful tool to assess such phenomena, in order to analyse in a quantitative manner the local metabolic activity of the bone, and to evaluate over the time the integration between host bone and prosthetic components. The purpose of the present study is to report about a preliminary experience in the analysis of osseointegration processes of patients undergoing a primary Total Hip Arthroplasty (THA) or a revision Total Knee Arthroplasty (rTKA). Materials and methods. Thirty patients undergoing THA and nineteen undergoing rTKA were included in this study. In fifteen cases of THA a standard cementless stem was used; in the other fifteen a short cementless stem was chosen. In all cases a cementless cup was implanted. In all patients undergoing rTKA, all implants had pressfit femoral and tibial diaphyseal stems; only the femoral component and the tibial plateau were cemented. DEXA evaluation was performed preoperatively, and at 3, 6, 12, and 24

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Stemmed femoral knee prostheses

Cited by 31 publications

References 30 publications

Computational modelling of motion at the bone–implant interface after total knee arthroplasty: The role of implant design and surgical fit

Computational modelling of motion at the bone–implant interface after total knee arthroplasty: The role of implant design and surgical fit

Microstructure and Mechanical Properties of Reticulated Titanium Scrolls

Densitometric evaluation of bone-prosthetic counterface in hip and knee arthroplasty with modern implants

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