Importance of in vitro assessment of total hip arthroplasty using hip simulator and preliminary results

Tribological performance of a metal-on-metal total hip arthroplasty was evaluated as a function of the diametral clearance between the femoral head and acetabular cup. Frictional torque results, measured by a pendulum apparatus, suggested that a threshold clearance existed. Below the threshold clearance, frictional torque increased nearly linearly as the clearance decreased. Beyond the threshold, the clearance effect was minimal. The wear results, measured using a hip simulator, showed that a running-in wear was present in the first million cycles. The subsequent steady-state wear rate was very low in all tested clearances. The highest running-in wear was associated with the largest clearance. These results demonstrated the usefulness of combining a pendulum test and a simulator wear test to fully characterize the clearance effect.

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Prospective study comparing functional outcomes and revision rates between hip resurfacing and total hip arthroplasty: preliminary results for 2 years

Orthopedic Reviews ◽

10.4081/or.2013.e20 ◽

2013 ◽

Vol 5 (3) ◽

pp. 20 ◽

Cited By ~ 3

Author(s):

Régis Pailhé ◽

Nicolas Reina ◽

Etienne Cavaignac ◽

Akash Sharma ◽

Valérie Lafontan ◽

...

Keyword(s):

Total Hip Arthroplasty ◽

Hip Arthroplasty ◽

Functional Outcomes ◽

Hip Resurfacing ◽

Harris Hip Score ◽

Preliminary Results ◽

Total Hip ◽

Group 2 ◽

Group 1

There is a need of independent prospective studies about modern generation of hip resurfacing implants. The aim of this propective observational study was to compare the functional outcomes and revision rates with hip resurfacing arthroplasty and total hip arthroplasty and to present the preliminary results at 2 years. Patients included were recruited prospectively in the <em>Partial Pelvic Replacement Hip Project </em>by a single surgeon between January 2007 and January 2010. Patients were assessed with the Harris Hip Score (HHS) and Postel-Merle d’Aubigné (MDA) score and Devane Score. The end point of the study was reoperation for any cause related to the prosthesis. At a mean follow up of 38.6 months there were a total of 142 patients with hip resurfacing (group 1) [100 Durom® (Zimmer Inc., Warsaw, IN, USA) and 42 Birmingham Hip Resurfacing® (Smith & Nephew, Memphis, TN, USA)] and 278 patients with total hip arthroplasty (group 2). The results showed significantly greater gain of HHS, MDA and Devane score with hip resurfacing procedures. However, considering all the complications, the rate was significantly higher in group 16.4% <em>vs</em> 1.79% in group 2 (P<0.0001). In group 1 we observed 6 complications only concerned males with Durom® implants. The follow up of this cohort is still on going and may deliver more information on the evolution of these results in time.

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In vitro and in vivo studies of pressurization of femoral cement in total hip arthroplasty

The Journal of Arthroplasty ◽

10.1016/0883-5403(93)90004-n ◽

1993 ◽

Vol 8 (6) ◽

pp. 585-591 ◽

Cited By ~ 23

Author(s):

Jeff P. Davies ◽

William H. Harris

Keyword(s):

Total Hip Arthroplasty ◽

Hip Arthroplasty ◽

In Vivo Studies ◽

Total Hip

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In vitro and in vivo evaluations of the fully porous Ti6Al4V acetabular cups fabricated by a sintering technique

RSC Advances ◽

10.1039/c9ra00638a ◽

2019 ◽

Vol 9 (12) ◽

pp. 6724-6732 ◽

Cited By ~ 3

Author(s):

Ji Li ◽

Wei Li ◽

Zhongli Li ◽

Yuxing Wang ◽

Ruiling Li ◽

...

Keyword(s):

Mechanical Properties ◽

Total Hip Arthroplasty ◽

Pore Size ◽

Hip Arthroplasty ◽

High Porosity ◽

Total Hip ◽

Large Pore ◽

Large Pore Size

The fully porous Ti6Al4V cup fabricated by the sintered technique showed high porosity, large pore size with good mechanical properties. It may be effective in achieving in vivo stability after the total hip arthroplasty.

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Stand up! Are normal weight-bearing forces sufficient for a 12/14 Morse taper locking in total hip arthroplasty?

Hip International ◽

10.1177/1120700020967000 ◽

2020 ◽

pp. 112070002096700

Author(s):

Suleman Qurashi ◽

Matthew H Pelletier ◽

Tian Wang ◽

Nicholas Bramich ◽

Jason Chinnappa ◽

...

Keyword(s):

Surface Roughness ◽

Total Hip Arthroplasty ◽

Hip Arthroplasty ◽

Weight Bearing ◽

Normal Weight ◽

Total Hip ◽

Ceramic Femoral Head ◽

Head Surface ◽

Cyclical Loading

Background: The aim of this study was to investigate total hip arthroplasty (THA) Morse taper pull-off strengths after impaction prior to cyclical loading compared to cyclical loading alone. The practical relevance of the experiment is to provide a perspective on what may be clinically satisfactory taper assembly given the spectrum of head tapping patterns used by surgeons, as well as compare traditional impaction performed in standard THA with alternate methods of taper engagement such as ‘ in situ assembly’ used in micro-invasive techniques. Methods: 36 taper constructs utilising a combination of cobalt-chrome alloy and ceramic-titanium alloy junctions were investigated in vitro in wet and dry conditions with cyclical loading of the constructs. Taper disengagement strengths with and without impaction were compared. Secondary investigation of the surface roughness of the heads and tapers was also assessed. Results: An impaction to a wet taper resulted in a greater pull off force compared to a dry taper with a CoCr head and taper combination. Impacting the head and dryness of the taper did not affect pull off forces of a ceramic femoral head on titanium taper. Pulling a head off a taper significantly alters the head surface roughness. Conclusion: Impaction of a taper does not provide any benefit over cyclical loading of a taper assembly alone for pull-off strength.

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