New Materials for Mobile Bearing Knee Prosthesis — Titanium Nitride Counterface Coatings for Reduction of Polyethylene Wear

2002 ◽  
pp. 349-351 ◽  
Author(s):  
V. C. Jones ◽  
D. D. Auger ◽  
M. H. Stone ◽  
J. Fisher
Keyword(s):  
Titanium Nitride ◽  
Polyethylene Wear ◽  
Knee Prosthesis ◽  
Mobile Bearing ◽  
New Materials

scholarly journals Functionality and Safety of an Ultra-Congruent Rotating Platform Knee Prosthesis at 5.6 Years: More than 5- Year Follow-Up of the e.motion® UC-TKA

2013 ◽  
Vol 7 (1) ◽  
pp. 152-157 ◽  
Author(s):  
Jean-Baptiste Chavoix
Keyword(s):  
Adverse Events ◽  
Knee Injury ◽  
Polyethylene Wear ◽  
Knee Prosthesis ◽  
Mobile Bearing ◽  
Small Sample ◽  
Rotating Platform ◽  
Radiolucent Lines ◽  
Total Knee

Background: Mobile bearing TKA prostheses were designed to minimize polyethylene wear by increasing implant conformity and reducing stresses between the articulating prosthesis components. It is the purpose of this study to assess the mid-term functionality and clinical outcome associated with a highly congruent mobile platform design, the e.motion® UC total knee prosthesis. Material and Methods: Functional and clinical outcomes were assessed after an average of 5.6 years (5.1 – 6.0 years) after total knee arthroplasty in 28 patients (24 women), aged 77.8±7.5 years. The Knee injury and Osteoarthritis Outcome Score (KOOS) was assessed. Secondary outcomes included the Knee Society Score (KSS), radiological evaluation of radiolucent lines and recording of adverse events. Results: The average KOOS subscore for the activities of daily life was 77.8 points after 5.6 years. Both the clinical and functional KSS improved at 2.4 and 5.6 years. Two patients showed radiolucent lines at 5.6 years. Adverse events over 5.6 years included 3 subluxations, 1 tilting and 1 misalignment of the patella. None of the prostheses were revised. Conclusion: This pilot study shows promising outcomes for the e.motion® UC prosthesis. In the small sample, the implant performed comparably to the LCS prosthesis (the gold standard). There were no loosenings or revisions observed at 5.6 years.

scholarly journals Titanium-Nitride Coating of Orthopaedic Implants: A Review of the Literature

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Ruud P. van Hove ◽  
Inger N. Sierevelt ◽  
Barend J. van Royen ◽  
Peter A. Nolte
Keyword(s):  
Titanium Nitride ◽  
Polyethylene Wear ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Coating Process ◽  
Orthopaedic Implant ◽  
Cohesive Failure ◽  
Orthopaedic Implants ◽  
Tin Coating ◽  
Titanium Nitride Coating ◽  
English Medical Literature

Surfaces of medical implants can be enhanced with the favorable properties of titanium-nitride (TiN). In a review of English medical literature, the effects of TiN-coating on orthopaedic implant material in preclinical studies were identified and the influence of these effects on the clinical outcome of TiN-coated orthopaedic implants was explored. The TiN-coating has a positive effect on the biocompatibility and tribological properties of implant surfaces; however, there are several reports of third body wear due to delamination, increased ultrahigh molecular weight polyethylene wear, and cohesive failure of the TiN-coating. This might be due to the coating process. The TiN-coating process should be optimized and standardized for titanium alloy articulating surfaces. The clinical benefit of TiN-coating of CoCrMo knee implant surfaces should be further investigated.

Polyethylene Wear in Mobile-Bearing Prostheses

Orthopedics ◽  
2002 ◽  
Vol 25 (2) ◽  
Author(s):  
Douglas J Kilgus
Keyword(s):  
Polyethylene Wear ◽  
Mobile Bearing

scholarly journals Intermediary multicentric prospective and comparative analysis of 435 Mobile bearing Total Knee Arthroplasties of Ultra Congruent stabilization mechanism versus Peg and Cam stabilization mechanism A point-in-time analysis of the OrthowaveTM6 database

2020 ◽  
pp. 4-11
Author(s):  
J.M. Durand ◽  
P. Viale ◽  
P. Massin ◽  
J.L. Cotte ◽  
C. Jardin
Keyword(s):  
Functional Performance ◽  
Knee Prosthesis ◽  
Average Length ◽  
Mobile Bearing ◽  
Control Analysis ◽  
Stabilization Mechanism ◽  
New Device ◽  
Patient Profile ◽  
Total Knee

The Rolflex TONIC total knee implant was launched in early 2016. It is a cruciate sacrificing design and offers a choice of 2 cruciate substituting mechanism according to the UC (Ultra-Congruent) concept or to the PS (Postero-stabilisation with peg and cam) concept. The PS choice can be associated to a fixed tibial bearing or to a mobile tibial bearing, while the UC choice can only be associated to a mobile tibial bearing. The international use of UC total knee prosthesis is low: according to the 2019 AJRR report the UC variant was up at 4.5% of use in 2018, while the PS variant accounted for the largest frequency of use at 51.6%. The second most used type of TKA was the cruciate retaining (CR) variant at 43.8% of use. There is currently no CR variant in the Rolflex TONIC portfolio. In order to inform of any differences in terms of etiology, indications, patient profile, surgical choices, and clinical and functional performance between the PS and the UC cruciate substituting mechanisms, this document will analyze only the mobile bearing variants of the Roflex TONIC UC and PS. The patients implanted with Fixed bearing PS will not be included in this analysis. A prospective clinical follow-up of the Rolflex TONIC has been organized by the sponsor (Evolutis, Briennon, France) to evaluate the safety and performance of this new device. This study includes the implants used since June 2016 and up to December 2018. The study design will review the patients at 2, 5 and 10 years of follow-up. At the date of this intermediary report, the 2 years review is not yet terminated. The 2 years report is expected for early 2021 when all patients included will show more than 2 years of FU. Therefore, this intermediary analysis should only be viewed as a security control analysis in search for any anticipated deviation in the expected results. The average length of follow- up will remain short until all patients will be reviewed at 2 years of minimal FU, yet it will evidence if any short or mid-term complication occurred, and how good is the recovery of the patients estimated through an IKS and an OXFORD scores.

Does low-constraint mobile bearing knee prosthesis give satisfactory results for severe coronal deformities? A five to twelve year follow up study

2017 ◽  
Vol 41 (7) ◽  
pp. 1369-1377 ◽  
Author(s):  
Jaroslaw Czekaj ◽  
Camdon Fary ◽  
Thierry Gaillard ◽  
Sebastien Lustig
Keyword(s):  
Knee Prosthesis ◽  
Mobile Bearing ◽  
Follow Up Study ◽  
Low Constraint

Mobility and Stability of the Intact and Replaced Knee

2015 ◽  
Author(s):  
John Goodfellow ◽  
John O'Connor ◽  
Hemant Pandit ◽  
Christopher Dodd ◽  
David Murray
Keyword(s):  
Total Knee Replacement ◽  
Knee Replacement ◽  
Final Section ◽  
Sagittal Plane ◽  
Polyethylene Wear ◽  
Mobile Bearing ◽  
Theoretical Background ◽  
Cruciate Retaining ◽  
Prosthetic Knee ◽  
Total Knee

Having demonstrated in Chapter 2 that a fully conforming mobile bearing can minimise polyethylene wear, in this chapter we show that a mobile bearing prosthesis, unconstrained in the sagittal plane, can restore natural mobility and stability. For surgeon readers who are less interested in the theoretical background, it might be advisable to go straight to Chapter 4, Indications, or to start by reading the final section of this chapter, The Loaded Prosthetic Knee. If that proves interesting, the surgeon might attempt The Unloaded Prosthetic Knee. For the more research minded surgeon or engineer, it seems more logical to start with the Unloaded Natural Knee (the longest section of the chapter) and to read from there. The chapter may also be of interest to those surgeons embarking on the use of a bi-cruciate retaining total knee replacement.

scholarly journals A Technical Tip to Avert Meniscal Rotation and Dislocation in a Mobile Bearing Unicompartmental Knee Arthroplasty

2020 ◽  
Vol 3 (1) ◽  
pp. 42-48
Author(s):  
Vijay Kumar ◽  
Mayur Nayak ◽  
Rajan Panthee ◽  
Rahul Yadav ◽  
Siddhartha Marendupaka
Keyword(s):  
Case Report ◽  
Surgical Technique ◽  
Blood Loss ◽  
Polyethylene Wear ◽  
Vertical Wall ◽  
Mobile Bearing ◽  
Common Complication ◽  
Unicondylar Knee Replacement ◽  
Tibial Cut ◽  
Bearing Dislocation

The Oxford (Oxford® partial knee; Biomet) mobile bearing medial unicondylar knee replacement (OUKR) is a preferred choice by surgeons due to minimal blood loss, reduced pain, and better range of motion. Commonly observed complications include aseptic loosening, polyethylene wear, bearing dislocation, and periprosthetic fractures. A bearing dislocation can be prevented by ensuring that there is correct tracking of bearing during the trial reduction as well as no loss of entrapment. We present a case report in a 50-year-old patient undergoing bilateral OUKR wherein it was observed that the meniscal bearing upon the flexion of the knee joint had the tendency to dislocate. Upon revising the vertical tibial recut according to the anterior superior iliac spine, the meniscus was found to have a normal excursion. Mobile bearing dislocation is a unique complication of mobile bearing OUKR. Surgical technique is of paramount importance in ensuring a successful OUKR. The vertical tibial cut is made to accommodate the vertical wall of the tibial component. Meniscal displacement is quite a common complication and can occur due to multiple causes. Inaccurate vertical tibial cut may be one such reason leading to tibial dislocation.

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