scholarly journals In Vitro Evidence for Cell‐Accelerated Corrosion Within Modular Junctions of Total Hip Replacements

2019 ◽  
Vol 38 (2) ◽  
pp. 393-404 ◽  
Author(s):  
Divya Rani Bijukumar ◽  
Shruti Salunkhe ◽  
Dalton Morris ◽  
Abhijith Segu ◽  
Deborah J. Hall ◽  
...  
Keyword(s):  
Accelerated Corrosion ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements

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.

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

Micro-Separation in Vitro Produces Clinically Relevant Wear of Ceramic-Ceramic Total Hip Replacements

2000 ◽  
Vol 192-195 ◽  
pp. 529-532 ◽  
Author(s):  
J. Nevelos ◽  
E. Ingham ◽  
Crispin Doyle ◽  
Robert Streicher ◽  
A. Nevelos ◽  
...  
Keyword(s):  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements

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 An MRI-Based Patient-Specific Computational Framework for the Calculation of Range of Motion of Total Hip Replacements

2021 ◽  
Vol 11 (6) ◽  
pp. 2852
Author(s):  
Maeruan Kebbach ◽  
Christian Schulze ◽  
Christian Meyenburg ◽  
Daniel Kluess ◽  
Mevluet Sungu ◽  
...  
Keyword(s):  
Range Of Motion ◽  
Internal Rotation ◽  
Computer Aided Design ◽  
External Rotation ◽  
Patient Specific ◽  
Computational Framework ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Significant Difference ◽  
Hip Replacements

The calculation of range of motion (ROM) is a key factor during preoperative planning of total hip replacements (THR), to reduce the risk of impingement and dislocation of the artificial hip joint. To support the preoperative assessment of THR, a magnetic resonance imaging (MRI)-based computational framework was generated; this enabled the estimation of patient-specific ROM and type of impingement (bone-to-bone, implant-to-bone, and implant-to-implant) postoperatively, using a three-dimensional computer-aided design (CAD) to visualize typical clinical joint movements. Hence, patient-specific CAD models from 19 patients were generated from MRI scans and a conventional total hip system (Bicontact® hip stem and Plasmacup® SC acetabular cup with a ceramic-on-ceramic bearing) was implanted virtually. As a verification of the framework, the ROM was compared between preoperatively planned and the postoperatively reconstructed situations; this was derived based on postoperative radiographs (n = 6 patients) during different clinically relevant movements. The data analysis revealed there was no significant difference between preoperatively planned and postoperatively reconstructed ROM (∆ROM) of maximum flexion (∆ROM = 0°, p = 0.854) and internal rotation (∆ROM = 1.8°, p = 0.917). Contrarily, minor differences were observed for the ROM during maximum external rotation (∆ROM = 9°, p = 0.046). Impingement, of all three types, was in good agreement with the preoperatively planned and postoperatively reconstructed scenarios during all movements. The calculated ROM reached physiological levels during flexion and internal rotation movement; however, it exceeded physiological levels during external rotation. Patients, where implant-to-implant impingement was detected, reached higher ROMs than patients with bone-to-bone impingement. The proposed framework provides the capability to predict postoperative ROM of THRs.

scholarly journals A comparison of metal/metal and ceramic/metal taper‐trunnion modular connections in explanted total hip replacements

2021 ◽  
Author(s):  
Eileen S. Cadel ◽  
L.D. Timmie Topoleski ◽  
Oleg Vesnovsky ◽  
Charles R. Anderson ◽  
Robert H. Hopper ◽  
...  
Keyword(s):  
Total Hip ◽  
Total Hip Replacements ◽  
Metal Metal ◽  
Hip Replacements
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