Volume 3, Issue 4, Pages (December 2017)

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Presentation transcript:

Volume 3, Issue 4, Pages 234-238 (December 2017) Fatigue fracture of a cemented Omnifit CoCr femoral stem: implant and failure analysis Noah Bonnheim, MS, Hannah Gramling, MS, Michael Ries, MD, Sanjai Shukla, MD, Beatrice Iliescu, MS, Lisa Pruitt, PhD Arthroplasty Today Volume 3, Issue 4, Pages 234-238 (December 2017) DOI: 10.1016/j.artd.2017.06.005 Copyright © 2017 The Authors Terms and Conditions

Figure 1 Radiograph of the primary implant reveal a mid-stem fracture, acetabular osteolysis, proximal implant migration, and a loose cement mantle. The location of fracture is denoted by the white arrow. Arthroplasty Today 2017 3, 234-238DOI: (10.1016/j.artd.2017.06.005) Copyright © 2017 The Authors Terms and Conditions

Figure 2 Photograph showing failure at the midportion of the stem, at approximately 38% of the stem length, measured from the collar. Arthroplasty Today 2017 3, 234-238DOI: (10.1016/j.artd.2017.06.005) Copyright © 2017 The Authors Terms and Conditions

Figure 3 Low-magnification photographs reveal a large apparent grain structure at the location of fracture. Arthroplasty Today 2017 3, 234-238DOI: (10.1016/j.artd.2017.06.005) Copyright © 2017 The Authors Terms and Conditions

Figure 4 Scanning electron microscopy images of the fracture surface show (a) intergranular fracture (b) regions of porosity. Arthroplasty Today 2017 3, 234-238DOI: (10.1016/j.artd.2017.06.005) Copyright © 2017 The Authors Terms and Conditions

Figure 5 Optical images of the etched surfaces cross-sectioned near the site of fracture showing (a) large dendritic grain structure and (b) uniformly distributed carbide precipitates within the grains and at the grain boundaries. Arthroplasty Today 2017 3, 234-238DOI: (10.1016/j.artd.2017.06.005) Copyright © 2017 The Authors Terms and Conditions

Figure 6 Implant model for the case of proximal bone support showing (a) 2-dimensional free-body diagram of the leg. The dimensions, a and b, were measured using patient radiographs whereas the distance from the greater trochanter to the leg center-of-mass, c, was estimated using established anthropometric data [18]. (b) Free-body diagram used to determine the resultant axial and shear forces, Ry and Rx, and moment (M) at the location of fracture. (c) Cross-sectional properties of the bone-cement-implant composite at the site of fracture, estimated using radiographic as well as physical implant measurements. Poly(methyl methacrylate) bone cement was assumed to fill the space between the implant and cortical bone. Arthroplasty Today 2017 3, 234-238DOI: (10.1016/j.artd.2017.06.005) Copyright © 2017 The Authors Terms and Conditions

Figure 7 Free-body diagram used to estimate implant stresses at the location of fracture for the case of fixation exclusively distal to the fracture site. Arthroplasty Today 2017 3, 234-238DOI: (10.1016/j.artd.2017.06.005) Copyright © 2017 The Authors Terms and Conditions