Development and validation of an acoustic emission device to measure wear in total hip replacements in-vitro and in-vivo

2017 ◽  
Vol 33 ◽  
pp. 281-288 ◽  
Author(s):  
Anthony J. FitzPatrick ◽  
Geoffrey W. Rodgers ◽  
Gary J. Hooper ◽  
Tim B.F. Woodfield
Keyword(s):  
Acoustic Emission ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements ◽  
Development And Validation ◽  
Emission Device

Long-Term Survival of Stanmore Total Hip Replacements Inserted with Radiolucent Bone Cement

2002 ◽  
Vol 12 (3) ◽  
pp. 274-280
Author(s):  
J.A. Wimhurst ◽  
J.L. Hobby ◽  
C.P. Roberts ◽  
A.N. Gibbs ◽  
L.J. Deliss ◽  
...  
Keyword(s):  
Bone Cement ◽  
In Vivo Studies ◽  
Long Term Results ◽  
Term Survival ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements

Radio-opacifiers in bone cements are an accepted part of every-day practice. They have, however, been shown to be a potential cause of an increase in third body wear and to excite bone resorption in in vitro and in vivo studies. We reviewed the results of 228 consecutive Stanmore total hip replacements performed between 1981 and 1985 in 211 patients. All were inserted with radiolucent bone cement. Information regarding whether the prosthesis had been revised was available for all patients. Seventy-three patients (83 hips) were still alive and 41 patients (44 hips) were sufficiently healthy to attend clinic. Information regarding pain level was obtained from the remaining 32 patients. When revision of the implant was taken as the end-point, there was 95% ten-year survival, 91% fifteen-year survival and 75% eighteen-year survival. These long-term results of Stanmore THRs, performed in a district general hospital, with radiolucent bone cement, compare favourably with the other published series for this implant. We did not find the inability to see the bone cement a particular disadvantage when reviewing radiographs for signs of loosening.

scholarly journals Biotribology in Arthroplasty: Worn Surfaces Investigation on Ceramic Hip Femoral Heads Considering Wettability

2020 ◽  
Vol 10 (24) ◽  
pp. 8919
Author(s):  
Saverio Affatato ◽  
Alessandro Ruggiero
Keyword(s):  
Amplitude Distribution ◽  
Average Roughness ◽  
Surface Evolution ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Roughness Profile ◽  
Femoral Heads ◽  
Hip Replacements ◽  
Worn Surfaces

Ceramic-on-ceramic bearings for total hip replacement are considered the best choice to avoid problems such as osteolysis and wear, mainly related to soft bearings. The aim of this work was to investigate in a comparative way different kinds of ceramic femoral heads for total hip replacements from a biotribological point of view, discussing the results obtained in terms of topographies, presence of metal transfer (MT) phenomena, and wettability on their worn surfaces in a tribological framework. Different ceramic femoral heads derived from in vitro wear tests, retrieved form patients, and brand new total hip replacements were investigated. The patients group had an average age of 60 years (ranging from 27 to 83). In most cases, the cause of failure was aseptic loosening of the acetabular component. Roughness analyses were performed to measure the tribological surface evolution of the material; an SEM and EDS investigation on the explanted heads proves and quantified MT, while the wettability was measured through a novel optical laboratory set-up with the aim to furnish useful data in the framework of synovial lubrication phenomena acting in the tribosystem. For the average roughness measurements on explanted specimens were considered three parameters (Ra = the average area between the roughness profile and its mean line; Rt = the vertical distance from the deepest valley to the highest peak of the roughness profile; and Rsk = it is the skewness and it is a measure of the asymmetry of the amplitude distribution function. In other words, the skewness indicates whether a surface is dominated by peaks or by valleys) and their values were: Ra 0.22 ± 0.12 μm, Rt 34.5 ± 13.5 μm and Rsk −0.01 ± 11.3; on the new specimens we measured Ra 0.01 ± 0.001 μm, Rt 0.12 ± 0.09 μm, and Rsk = 5.67 ± 8.7; for the in vitro specimens they were Ra 0.05 ± 0.12 μm, Rt 0.71 ± 1.4 μm and Rsk 7.73 ± 20.6. The wettability angle measurements showed hydrophilic surfaces for all femoral heads considered in this study with small differences between the three investigated categories, allowing to discuss their effects on the biobearings’ lubrication phenomena.

Quantification of self-polishing in vivo from explanted metal-on-metal total hip replacements

2011 ◽  
Vol 44 (5) ◽  
pp. 513-516 ◽  
Author(s):  
Thomas J. Joyce ◽  
Harry Grigg ◽  
David J. Langton ◽  
Antoni V.F. Nargol
Keyword(s):  
Total Hip ◽  
Total Hip Replacements ◽  
Metal On Metal ◽  
Hip Replacements

In vivo wear of bilateral total hip replacements: conventional versus crosslinked polyethylene

2005 ◽  
Vol 125 (8) ◽  
pp. 555-557 ◽  
Author(s):  
Christian Heisel ◽  
Mauricio Silva ◽  
Thomas P. Schmalzried
Keyword(s):  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements

In Vivo Polyethylene Wear of Bilateral Total Hip Replacements - Cemented versus Uncemented Modular Sockets

2010 ◽  
Vol 20 (4) ◽  
pp. 447-452 ◽  
Author(s):  
Rebecca J. Kampa ◽  
Andrew Hacker ◽  
Emmett Griffiths ◽  
John W. Rosson
Keyword(s):  
Polyethylene Wear ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements

scholarly journals Design Study on Customised Piezoelectric Elements for Energy Harvesting in Total Hip Replacements

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3480
Author(s):  
Hans-E. Lange ◽  
Rainer Bader ◽  
Daniel Kluess
Keyword(s):  
Energy Harvesting ◽  
Power Output ◽  
Piezoelectric Element ◽  
Element Model ◽  
Design Study ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements ◽  
Therapeutic Measures

Energy harvesting is a promising approach to power novel instrumented implants that have passive sensory functions or actuators for therapeutic measures. We recently proposed a new piezoelectric concept for energy harvesting in total hip replacements. The mechanical implant safety and the feasibility of power generation were numerically demonstrated. However, the power output for the chosen piezoelectric element was low. Therefore, we investigated in the present study different geometry variants for an increased power output for in vivo applications. Using the same finite element model, we focused on new, customised piezoelectric element geometries to optimally exploit the available space for integration of the energy harvesting system, while maintaining the mechanical safety of the implant. The result of our iterative design study was an increased power output from 29.8 to 729.9 µW. This amount is sufficient for low-power electronics.

Non-invasive early detection of failure modes in total hip replacements (THR) via acoustic emission (AE)

2021 ◽  
Vol 118 ◽  
pp. 104484
Author(s):  
Christine Lee ◽  
Lu Zhang ◽  
Dalton Morris ◽  
Kai Yuan Cheng ◽  
Remya Ampadi Ramachandran ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Early Detection ◽  
Failure Modes ◽  
Total Hip ◽  
Non Invasive ◽  
Total Hip Replacements ◽  
Hip Replacements

In vitro measurement of strain in the bone cement surrounding the femoral component of total hip replacements during simulated gait and stair-climbing

1996 ◽  
Vol 14 (5) ◽  
pp. 769-777 ◽  
Author(s):  
Daniel O. O'Connor ◽  
Dennis W. Burke ◽  
Murali Jasty ◽  
Ronald C. Sedlacek ◽  
William H. Harris
Keyword(s):  
Bone Cement ◽  
Femoral Component ◽  
Stair Climbing ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements
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