scholarly journals Effect of interposed tissue and contamination on the initial stability of a highly porous press‐fit acetabular cup

2019 ◽  
Vol 37 (5) ◽  
pp. 1117-1122 ◽  
Author(s):  
Daniel H. Wiznia ◽  
Garrett Joyal ◽  
Gregg Schmidig ◽  
Raga Rajaravivarma ◽  
Raja Lokesh ◽  
...  
Keyword(s):  
Acetabular Cup ◽  
Press Fit ◽  
Initial Stability ◽  
Highly Porous

Contact Mechanics Analysis and Initial Stability of Press-Fit Metal-on-Metal Hip Resurfacing Prostheses

2005 ◽  
Author(s):  
I. Udofia ◽  
F. Liu ◽  
Z. Jin ◽  
P. Roberts ◽  
P. Grigoris
Keyword(s):  
Finite Element ◽  
Contact Mechanics ◽  
Bone Structure ◽  
Hip Resurfacing ◽  
Implant Stability ◽  
Acetabular Cup ◽  
Press Fit ◽  
Initial Stability ◽  
Metal On Metal

To ensure potential long-term stability and survivorship for metal-on-metal hip resurfacing prostheses, implant migration would need to be minimised to encourage bone in-growth. This study uses the finite element method to investigate the effects of the surgical press-fit procedure on the bearing and interfacial contact mechanics, and on the initial stability of a metal-on-metal (MOM) hip resurfacing prosthesis. The finite element models simulated the press-fit procedure using different amounts of interference between the cup-bone (1–2mm). The resurfacing prosthesis was implanted anatomically into a 3-D bone model. Resultant hip joint loads were applied to the model through muscle and subtrochanteric forces. Results showed that increasing the friction and the interference between the cup and bone resulted in significant reductions in the relative micromotion between the cup and bone. This would ensure the immediate post-operative stability of the acetabular cup and provide adequate conditions for potential long-term bone in-growth and implant stability. The contact mechanics at the bearing surfaces, which has a large effect on tribological performance, was found to be little affected by changes at the cup-bone interface. These findings are consistent with the general satisfactory short and medium-term clinical results of metal-on-metal hip resurfacing prostheses. This study suggests that interference, friction and a mechanically sound bone structure are important parameters to promote implant stability and support.

scholarly journals Press-fit acetabular cup fixation: Principles and testing

1999 ◽  
Vol 213 (1) ◽  
pp. 33-39 ◽  
Author(s):  
W Macdonald ◽  
L V Carlsson ◽  
G J Charnley ◽  
C M Jacobsson
Keyword(s):  
Acetabular Cup ◽  
Press Fit ◽  
Fixation Principles

Effect of cementless acetabular cup geometry on strain distribution and press-fit stability

1997 ◽  
Vol 12 (2) ◽  
pp. 207-212 ◽  
Author(s):  
Michael D. Ries ◽  
Mark Harbaugh ◽  
Jeff Shea ◽  
Richard Lambert
Keyword(s):  
Strain Distribution ◽  
Acetabular Cup ◽  
Press Fit

scholarly journals Clinical evaluation of a novel press-fit acetabular cup using “Ein-Bild-Roentgen-Analysis” (EBRA): A positive short-term prognosis

2020 ◽  
Vol 22 ◽  
pp. 33-37
Author(s):  
B.A. Ishaque ◽  
J. Wieczorek ◽  
C.A. Fonseca Ulloa ◽  
J.B. Seeger ◽  
G.A. Ahmed ◽  
...  
Keyword(s):  
Clinical Evaluation ◽  
Acetabular Cup ◽  
Short Term ◽  
Press Fit

Enhancement of initial stability of press-fit femoral stems using injectable calcium phosphate cement: an in vitro study in dog bones

Biomaterials ◽  
2004 ◽  
Vol 25 (17) ◽  
pp. 3887-3894 ◽  
Author(s):  
E.M. Ooms ◽  
N. Verdonschot ◽  
J.G.C. Wolke ◽  
W.Van de Wijdeven ◽  
M.M.M. Willems ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Calcium Phosphate Cement ◽  
In Vitro Study ◽  
Vitro Study ◽  
Press Fit ◽  
Initial Stability ◽  
Femoral Stems

Initial stability of a highly porous titanium cup in an acetabular bone defect model

2018 ◽  
Vol 23 (4) ◽  
pp. 665-670 ◽  
Author(s):  
Kensei Yoshimoto ◽  
Yasuharu Nakashima ◽  
Miyo Wakiyama ◽  
Daisuke Hara ◽  
Akihiro Nakamura ◽  
...  
Keyword(s):  
Bone Defect ◽  
Porous Titanium ◽  
Defect Model ◽  
Acetabular Bone ◽  
Acetabular Bone Defect ◽  
Initial Stability ◽  
Highly Porous

Double-Modular Hip Device Design Susceptible to Stress Corrosion Failure

2009 ◽  
Author(s):  
Sara A. Atwood ◽  
Eli W. Patten ◽  
Kevin J. Bozic ◽  
Lisa A. Pruitt ◽  
Michael D. Ries
Keyword(s):  
Femoral Head ◽  
Femoral Anteversion ◽  
Metal Alloy ◽  
Leg Length ◽  
Acetabular Cup ◽  
Corrosion Failure ◽  
Total Hip ◽  
Press Fit ◽  
Free Mobility ◽  
Hip Replacements

Total hip replacements restore pain-free mobility to approximately 200,000 patients in the U.S. each year [1]. A typical hip system comprises a metal alloy stem, a femoral head (ceramic or metal alloy), and a polyethylene acetabular cup fit into a metal alloy backing. A modular press-fit Morse taper is commonly used to attach the femoral head to the stem. There are also more recent designs that incorporate a second interface at the neck-stem junction (Figure 1). Increased modularity in total hip replacement design allows the surgeon to intraoperatively preserve patient anatomy such as leg length and femoral anteversion and better balance the surrounding soft tissue for optimal biomechanics. However, modularity also increases the number of mechanical junctions and interfaces in the device which may lead to complications such as corrosion, wear, and fracture.

scholarly journals Good mid-term results with the trident peripheral self-locking cup: a clinical evaluation and migration measurement with EBRA

2020 ◽  
Author(s):  
Dietmar Dammerer ◽  
Philipp Blum ◽  
David Putzer ◽  
Andreas Tscholl ◽  
Michael C. Liebensteiner ◽  
...  
Keyword(s):  
Trial Registration ◽  
Inclusion Criteria ◽  
Acetabular Cup ◽  
Term Outcome ◽  
Long Term Outcome ◽  
Press Fit ◽  
Medical Histories ◽  
Migration Analysis ◽  
Radiological Analysis

Abstract Introduction The most common cause of failure in total hip arthroplasty (THA) is aseptic loosening. Uncemented cup migration analysis by means of Einzel–Bild–Roentgen–Analyse (EBRA) has shown to be a good predictive indicator for early implant failure if the cup migrates more than 2 mm within 4 years after surgery. In this study, we performed a migration analysis of an uncemented peripheral self-locking (PSL) press-fit cup after 4 years follow-up. Materials and methods We retrospectively reviewed all patients who received a trident PSL press-fit cup at our department between 2004 and 2017. A total of 636 patients were identified. As inclusion criteria for radiological analysis, a minimum follow-up of 2 years was defined. We reviewed medical histories and performed radiological analysis using EBRA software. EBRA measurements and statistical investigations were performed by two independent investigators. Results A total of 149 cups in 146 patients (female 82; male 64) met our inclusion criteria. Mean age at surgery was 65 years (33–89). We found a significant improvement in the WOMAC score pre- to postoperative (p < 0.0001). EBRA migration analysis showed a mean total migration of 0.6 mm (0.0–8.2) over our follow-up period of 4 years. Of the investigated cups, 69.8% showed a migration rate smaller than 2 mm in the investigated follow-up. Conclusion The acetabular cup used in our study provides low migration at final follow-up. Therefore, a good long-term outcome can be expected for the PSL cup. Trial registration Trial registration number is 20181024-1875 and date of registration is 2018-10-24.

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