Volume 4, Issue 2, Pages (June 2018)

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Presentation transcript:

Volume 4, Issue 2, Pages 153-157 (June 2018) Two pegs are better than one: rare mode of femoral component failure in unicompartmental arthroplasty requiring revision to total knee arthroplasty Ryan Stancil, MD, Nathan Summers, PA-C, Douglas Van Citters, PhD, MS, Adam Sassoon, MD, MS Arthroplasty Today Volume 4, Issue 2, Pages 153-157 (June 2018) DOI: 10.1016/j.artd.2017.10.004 Copyright © 2017 The Authors Terms and Conditions

Figure 1 Anteroposterior radiograph of right knee with no evidence of UKA failure. Arthroplasty Today 2018 4, 153-157DOI: (10.1016/j.artd.2017.10.004) Copyright © 2017 The Authors Terms and Conditions

Figure 2 Lateral radiograph of a right knee with a medial UKA. Note the lucency posterior to the single femoral peg. Arthroplasty Today 2018 4, 153-157DOI: (10.1016/j.artd.2017.10.004) Copyright © 2017 The Authors Terms and Conditions

Figure 3 Intraoperative photograph showing the clearly fractured and grossly loose femoral UKA component. Arthroplasty Today 2018 4, 153-157DOI: (10.1016/j.artd.2017.10.004) Copyright © 2017 The Authors Terms and Conditions

Figure 4 (a) Anteroposterior and (b) lateral radiographs of final TKA components at 1 year postoperatively. Arthroplasty Today 2018 4, 153-157DOI: (10.1016/j.artd.2017.10.004) Copyright © 2017 The Authors Terms and Conditions

Figure 5 Explanted Vanguard femoral UKA component. Arthroplasty Today 2018 4, 153-157DOI: (10.1016/j.artd.2017.10.004) Copyright © 2017 The Authors Terms and Conditions

Figure 6 Close-up of fracture through femoral UKA component with evidence of fatigue striations. Arthroplasty Today 2018 4, 153-157DOI: (10.1016/j.artd.2017.10.004) Copyright © 2017 The Authors Terms and Conditions

Figure 7 Close-up of the articular surface of the explanted femoral component with signs of scratching and burnishing. Arthroplasty Today 2018 4, 153-157DOI: (10.1016/j.artd.2017.10.004) Copyright © 2017 The Authors Terms and Conditions

Figure 8 Electron microscopy revealing crack initiation and propagation sites. Arthroplasty Today 2018 4, 153-157DOI: (10.1016/j.artd.2017.10.004) Copyright © 2017 The Authors Terms and Conditions

Figure 9 Electron microscopy showing crack around grain boundaries. Arthroplasty Today 2018 4, 153-157DOI: (10.1016/j.artd.2017.10.004) Copyright © 2017 The Authors Terms and Conditions

Figure 10 Microstructure overview showing the presence of carbide precipitates within the grains as well as intermetallic phases along the grain boundaries. Arthroplasty Today 2018 4, 153-157DOI: (10.1016/j.artd.2017.10.004) Copyright © 2017 The Authors Terms and Conditions