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. 2023 Mar 16;143(10):6021–6031. doi: 10.1007/s00402-023-04824-y

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© The Author(s) 2023

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Fig. 4 — Typical a, c 2D and b, d 3D images of unworn and worn areas on retrieved Alivium femoral heads. The difference in surface roughness is evident in 2D images; in 3D images, the colour scale defines the magnitude of roughness