Volume 4, Issue 3, Pages (September 2018)

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Presentation transcript:

Volume 4, Issue 3, Pages 270-274 (September 2018) Catastrophic failure of tripolar constrained liners due to backside wear: a novel failure mode Christopher W. Jones, MD, PhD, Michael-Alexander Malahias, MD, Elexis Baral, BS, Timothy Wright, PhD, Thomas P. Sculco, MD, Peter K. Sculco, MD Arthroplasty Today Volume 4, Issue 3, Pages 270-274 (September 2018) DOI: 10.1016/j.artd.2018.04.002 Copyright © 2018 The Authors Terms and Conditions

Figure 1 (a) Simultaneous bilateral THA with cemented stem and cementless cup. (b) Revision of the right hip to a tripolar constrained acetabular liner after multiple dislocations. (c) High degree of eccentric polyethylene wear with contact of the intermediary metal head with the inner surface of the acetabular component. (d) Final revision with a modular dual mobility (MDM) liner. Arthroplasty Today 2018 4, 270-274DOI: (10.1016/j.artd.2018.04.002) Copyright © 2018 The Authors Terms and Conditions

Figure 2 (a) Postoperative radiograph of a primary THA with the use of constrained tripolar liner. (b) Anteroposterior radiograph showing a broken and displaced constraining ring with moderate eccentric polyethylene wear. (c) Final postoperative radiographs after revision to an MDM liner. Arthroplasty Today 2018 4, 270-274DOI: (10.1016/j.artd.2018.04.002) Copyright © 2018 The Authors Terms and Conditions

Figure 3 Retrieved constrained liners from (a) case 1 and (b) case 2. Both implants were severely damaged, consistent with failure caused by extreme backside wear. Arthroplasty Today 2018 4, 270-274DOI: (10.1016/j.artd.2018.04.002) Copyright © 2018 The Authors Terms and Conditions