Artificial joints are one of the most successful treatments for arthritis; however, artificial joint failure is still a critical issue. For example, wear and corrosion at different modular junctions are thought to be instigators of artificial joint failure [1]. To achieve uniform and predictable contact between the stem and head, it is important to optimize the surface structure and properties, along with the angle mismatch, straightness, and conicity of the taper and trunnion [2,3]. The purpose of our work was to investigate the effect of geometric parameters on the surface responses of the modular junction.

We studied four different Co–Cr taper junction designs: A, B, and C with fine-machined tapers and coarse-machined trunnions, and D with ground tapers and trunnions. A had a negative taper angle mismatch (taper angle > trunnion angle), C had a positive one, and B and D had...

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