The Tapered Press Fit Total Hip Arthroplasty

Swanson, Todd V.

doi:10.1016/j.arth.2005.03.017

Cited by 40 publications

(24 citation statements)

References 13 publications

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“…First of all, the surgical technique allows to perform a mini invasive approach, and to spare femoral neck bone. The assumption for the stability of stemless implants was well described by many authors, who demonstrate that the distal stem was not necessary for stability and for osseointegration after a short time period after implantation (10,19). The "total stemless implants" of Proxima (De Puy), and Nanos (Smith&Nephew) evaluated in this study are the partially neck preserving prostheses.…”

Section: Discussionmentioning

confidence: 99%

Bone Integration of New “Stemless” Hip Implants (Proxima Vs. Nanos). A DXA Study: Preliminary Results

Logroscino

Ciriello

D'Antonio

et al. 2011

Int J Immunopathol Pharmacol

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The development of short femoral prostheses has the advantage to preserve bone and soft tissues, restore hip geometry, permit mini-invasive techniques and allow quickly return to an active life, but very few studies described bone reaction to these new designed prostheses. The aim of the present study was to evaluate the osseointegration of two different partial neck retained stemless hip prosthesis at one year after surgery, measured by the changes of periprosthetic bone mineral density (BMD) in 5 regions ofinterest (ROIs) using a dual-energy X ray absorptiometry (DXA) device. The signs of stress-shielding were evaluated by standard radiographs. Thirty-two uncemented primary total hip arthroplasty (THA) patients allocated into 2 groups were evaluated. In the first group (n=19) a Proxima (De-Puy-J&J) hip stem was implanted. In the second group (n=12) a Nanos (Smith & Nephew) hip stem was used. We found that both the implants preserve metaphyseal bone stock and increase periprosthetic BMD. In Nanos prostheses a significant higher BMD values were observed in region of interest (ROI) 3 and 4 (p

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Section: Discussionmentioning

confidence: 99%

Bone Integration of New “Stemless” Hip Implants (Proxima Vs. Nanos). A DXA Study: Preliminary Results

Logroscino

Ciriello

D'Antonio

et al. 2011

Int J Immunopathol Pharmacol

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“…This is the case for dental implants and orthopedic devices for joint reconstruction (Swanson, 2005;Cochran et al, 2007). It is somewhat unusual for a textured implant to be placed upon the periosteal surface, and no data exists on the effectiveness of surface texturing in conditions that mimic NHP headposts.…”

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confidence: 97%

Surface roughness enhances the osseointegration of titanium headposts in non-human primates

Hacking¹,

Boyraz²,

Powers³

et al. 2012

Journal of Neuroscience Methods

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“…Nevertheless, several geometric characteristics obtained are in accordance with clinical observations. The minimization of displacement function f d leads to stems with wedge design to improve axial stability, and some sections are almost rectangular and the elbow is more accentuated to improve rotational stability [50,51]. With the minimization of contact stress function f t stem tip is small and circular to avoid direct contact with the cortical bone [52] and proximal sections are thicker to reduce stress at calcar region.…”

Section: Resultsmentioning

confidence: 99%

Bone Implant Design Using Optimization Methods

Fernandes

Ruben

Folgado

2010

Biomechanics of Hard Tissues

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Total hip arthroplasty (THA) is a successful treatment for joint and bone diseases as well as in fracture repair [1]. It involves the replacement of the natural joint by an artificial one, composed of a femoral stem and an acetabular component as shown in Figure 10.1. The femoral component can be classified as cemented or uncemented depending on the mode of fixation. Cemented stems are fixed using a bone cement layer between the femur and the implant, while cementless stems are placed directly in contact with the bone. In this case, the biological fixation is promoted by the stem coating such as hydroxyapatite or in general a porous surface.In the first 10 years after surgery, the THA success is greater than 80%; nevertheless, it is possible to indentify some causes of failure. Aseptic loosening is the main cause for failure, being responsible for approximately 60% of revisions [1,4]. This failure can be due to mechanical problems such as excessive bone loss [5], inefficient initial stability [6], or cement mantle fatigue [7]. Thigh pain is another important mechanical cause for implant failure, with more than 6% of incidence [4]. On the other hand, deep infection is the major biological problem with more than 5% of prevalence [1,4]. Actually, the majority of failures of the THA are related to mechanical factors.Regarding the mode of fixation, cemented stems are globally more durable than cementless ones, with a 90% survival rate after 12 years. For uncemented implants this rate is less than 80% [1]. However, some cementless stems achieve more than 95% survival rate after 12 years. In fact, cementless stems with good initial stability and osseointegration exhibit a superior performance [8]. Cemented stems are preferred for elderly people, but, for patients less than 60 years old, the number of uncemented stems has increased, particularly, in the past few decades. In the early 1990s cementless stems represented only 20% of THA and in 2005 this value increased to approximately 45% [1].As stated above, the long-term implant success is strongly related to mechanical factors. For cementless stems the initial mechanical conditions on bone-implant interface (primary stability) are very important for success of the prosthesis. In

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The Tapered Press Fit Total Hip Arthroplasty

Cited by 40 publications

References 13 publications

Bone Integration of New “Stemless” Hip Implants (Proxima Vs. Nanos). A DXA Study: Preliminary Results

Bone Integration of New “Stemless” Hip Implants (Proxima Vs. Nanos). A DXA Study: Preliminary Results

Surface roughness enhances the osseointegration of titanium headposts in non-human primates

Bone Implant Design Using Optimization Methods

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