Manufacturing lot affects polyethylene tibial insert volume, thickness, and surface geometry
- PMID: 23636769
- DOI: 10.1177/0954411913486755
Manufacturing lot affects polyethylene tibial insert volume, thickness, and surface geometry
Abstract
To perform wear measurements on retrieved joint replacement implants, a reference geometry of the implant's original state is required. Since implants are rarely individually scanned before implantation, a different, new implant of the same kind and size is frequently used. However, due to manufacturing variability, errors may be introduced into these measurements, as the dimensions between the retrieved and reference components may not be exactly the same. The hypothesis of this study was that new polyethylene tibial inserts from different manufacturing lots would demonstrate greater variability than those from the same lot. In total, 12 new tibial inserts of the same model and size were obtained, 5 from the same lot and the remainder from different lots. The geometry of each tibial insert was obtained using microcomputed tomography. Measurements of tibial insert volume, thickness, and three-dimensional surface deviations were obtained and compared between tibial inserts from the same and different manufacturing lots. Greater variability was found for the tibial inserts from different manufacturing lots for all types of measurements, including a fourfold difference in volume variability (p < 0.001) and a maximum of 0.21 mm difference in thickness (p < 0.001). Investigators should be aware of this potential confounding error and take steps to minimize it, such as by averaging together the geometries of multiple new components from different manufacturing lots for use as the reference geometry.
Keywords: Total knee replacement; dimensioning and tolerances; implant retrieval study; manufacturing; microcomputed tomography.
Similar articles
-
Determination of reference geometry for polyethylene tibial insert wear analysis.J Arthroplasty. 2011 Apr;26(3):497-503. doi: 10.1016/j.arth.2010.01.096. Epub 2010 Mar 26. J Arthroplasty. 2011. PMID: 20347254
-
How do CAD models compare with reverse engineered manufactured components for use in wear analysis?Clin Orthop Relat Res. 2012 Jul;470(7):1847-54. doi: 10.1007/s11999-011-2143-0. Clin Orthop Relat Res. 2012. PMID: 22016002 Free PMC article.
-
Surface extraction can provide a reference for micro-CT analysis of retrieved total knee implants.Knee. 2014 Aug;21(4):801-5. doi: 10.1016/j.knee.2014.04.009. Epub 2014 Apr 26. Knee. 2014. PMID: 24853191
-
In vitro quantification of wear in tibial inserts using microcomputed tomography.Clin Orthop Relat Res. 2011 Jan;469(1):107-12. doi: 10.1007/s11999-010-1490-6. Clin Orthop Relat Res. 2011. PMID: 20676810 Free PMC article.
-
Pop-top tibial component: elimination of back-side wear with potential modularity.Surg Technol Int. 2004;13:253-60. Surg Technol Int. 2004. PMID: 15744698 Review.
Cited by
-
Wear Distribution Detection of Knee Joint Prostheses by Means of 3D Optical Scanners.Materials (Basel). 2017 Mar 30;10(4):364. doi: 10.3390/ma10040364. Materials (Basel). 2017. PMID: 28772725 Free PMC article.
-
Radiostereometric Analysis Permits In Vivo Measurement of Very Small Levels of Wear in TKA.Clin Orthop Relat Res. 2019 Jan;477(1):80-90. doi: 10.1097/CORR.0000000000000399. Clin Orthop Relat Res. 2019. PMID: 30794231 Free PMC article.
-
Relationship of surface damage appearance and volumetric wear in retrieved TKR polyethylene liners.J Biomed Mater Res B Appl Biomater. 2017 Oct;105(7):2053-2059. doi: 10.1002/jbm.b.33684. Epub 2016 Jul 12. J Biomed Mater Res B Appl Biomater. 2017. PMID: 27401236 Free PMC article.
-
CORR Insights®: Radiostereometric Analysis Permits In Vivo Measurement of Very Small Levels of Wear in TKA.Clin Orthop Relat Res. 2019 Jan;477(1):91-94. doi: 10.1097/CORR.0000000000000454. Clin Orthop Relat Res. 2019. PMID: 30179960 Free PMC article. No abstract available.
-
Inter and intra-system size variability of reverse shoulder arthroplasty polyethylene inserts.Int J Shoulder Surg. 2016 Jan-Mar;10(1):10-4. doi: 10.4103/0973-6042.174512. Int J Shoulder Surg. 2016. PMID: 26980984 Free PMC article.
MeSH terms
Substances
LinkOut - more resources
Full Text Sources
Other Literature Sources