Next Article in Journal
Phase Evolution, Filler-Matrix Interactions, and Piezoelectric Properties in Lead Zirconate Titanate (PZT)-Filled Polymer-Derived Ceramics (PDCs)
Next Article in Special Issue
Model-Based Roentgen Stereophotogrammetric Analysis to Monitor the Head–Taper Junction in Total Hip Arthroplasty in Vivo—And They Do Move
Previous Article in Journal
Nailing of Layers: A Promising Way to Reinforce Concrete 3D Printing Structures
Previous Article in Special Issue
Antimicrobial Silver Multilayer Coating for Prevention of Bacterial Colonization of Orthopedic Implants
Open AccessArticle

Retrieval Analysis of Modern Knee Tumor Megaendoprosthesis Shows Considerable Volumetric Metal Wear Generated at the Rotating Hinge

1
Laboratory of Biomechanics and Implant Research, Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, 69118 Heidelberg, Germany
2
Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, 69118 Heidelberg, Germany
3
ATOS Clinic Heidelberg, 69115 Heidelberg, Germany
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1519; https://doi.org/10.3390/ma13071519 (registering DOI)
Received: 28 February 2020 / Revised: 23 March 2020 / Accepted: 25 March 2020 / Published: 26 March 2020
Frequently occurring damage, as well as elevated blood metal ion levels, are reported in relation to a tumor and revision system for total knee arthroplasty (TKA), which applies a rotating hinge coupling with a metal-on-metal (MoM) articulation. As the patient collective for this specific system is small, there is no data on wear generated from the couplings. In this study, wear volume and influencing parameters were investigated at 44 retrieved TKAs with MoM couplings. A scoring system rating frequently occurring abrasive wear between 0 (no wear) and 3 (distinct wear) was established. The wear score was correlated to time in vivo, bone resection length, patient weight and polyethylene inlay damage. Volumetric wear was estimated applying coordinate measurements. An elevated wear score of two or higher was found in 43% of cases. The mean wear rate accounted to 7.8 mm3/year. The main influencing coefficient for the extent of wear is time in vivo. We found a tendency for higher wear scores with higher inlay degradation scores. Patient weight and bone resection length did not impact coupling wear. Assessment of wear damage by a semi-quantitative scoring system has proven to be a reliable option for non-destructive coupling evaluation. The generated wear volume is high. View Full-Text
Keywords: metal wear; retrieval study; metal-on-metal articulation; volumetric wear; megaendoprosthesis; total knee arthroplasty; bone tumor metal wear; retrieval study; metal-on-metal articulation; volumetric wear; megaendoprosthesis; total knee arthroplasty; bone tumor
Show Figures

Figure 1

MDPI and ACS Style

Bormann, T.; Jäger, S.; Kretzer, J.P.; Nebel, L.; Clarius, L.; Omlor, G.; Bitsch, R.; Lehner, B. Retrieval Analysis of Modern Knee Tumor Megaendoprosthesis Shows Considerable Volumetric Metal Wear Generated at the Rotating Hinge. Materials 2020, 13, 1519.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop