Maarten Koper, MD, Rob Verdijk, MD, PhD, Koen Bos, MD, PhD

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Presentation transcript:

Asymptomatic intraprosthetic dual mobility cup dislocation with increased metal ion levels Maarten Koper, MD, Rob Verdijk, MD, PhD, Koen Bos, MD, PhD Arthroplasty Today Volume 5, Issue 1, Pages 38-42 (March 2019) DOI: 10.1016/j.artd.2018.12.001 Copyright © 2018 The Authors Terms and Conditions

Figure 1 Anteroposterior radiograph (a) before the first revision of the left total hip prosthesis. The eccentric head of the Charnley prosthesis clearly demonstrates wear. Anteroposterior radiograph (b) after the first total revision and placement of the Avantage cemented dual mobility cup. Arthroplasty Today 2019 5, 38-42DOI: (10.1016/j.artd.2018.12.001) Copyright © 2018 The Authors Terms and Conditions

Figure 2 Regular control shows an eccentric femoral metal head caused by an intraprosthetic dislocation. There is no total dislocated hip, and there is no sign of polyethylene component outside the metal shell (bubble sign). (a) Anteroposterior view. (b) Adduction view. (c) Abduction view. (d) Lateral view. Arthroplasty Today 2019 5, 38-42DOI: (10.1016/j.artd.2018.12.001) Copyright © 2018 The Authors Terms and Conditions

Figure 3 Perioperative photograph of the revision operation. The black tissue around the prosthesis shows the amount of metallic debris. An intraprosthetic dislocation was found as shown by the dislodged femoral metal head from the high molecular weight cross-linked polyethylene liner. Arthroplasty Today 2019 5, 38-42DOI: (10.1016/j.artd.2018.12.001) Copyright © 2018 The Authors Terms and Conditions

Figure 4 (a) Metal head and shell with cement immediately after the revision. (b) The undamaged highly cross-linked polyethylene liner. (c) Surface abrasions of the articulating part of the metal head. (d) Close up of the severe wear in the metal shell. Arthroplasty Today 2019 5, 38-42DOI: (10.1016/j.artd.2018.12.001) Copyright © 2018 The Authors Terms and Conditions

Figure 5 Direct postoperative radiograph after the second revision of the left total hip prosthesis. (a) Anteroposterior view. (b) Lateral view. Arthroplasty Today 2019 5, 38-42DOI: (10.1016/j.artd.2018.12.001) Copyright © 2018 The Authors Terms and Conditions

Figure 6 (a) Light micrograph showing typical histologic features of dense lymphohistiocytic aggregates (stain, hematoxylin and eosin, original magnification ×400). (b) Polarized micrograph showing black birefringent crystalline material (original magnification ×400). This received an ALVAL score of 8 (3 for synovial lining, 3 for inflammatory infiltrate, and 2 for tissue organization). ALVAL, aseptic lymphocytic vasculitis-associated lesion. Arthroplasty Today 2019 5, 38-42DOI: (10.1016/j.artd.2018.12.001) Copyright © 2018 The Authors Terms and Conditions