Abstract
We read with interest the article by Chalmers et al. [1] and congratulate them on their work. They present the early (minimum 2 years) survival of 3D-printed titanium tibial metaphyseal cones used during revision total knee arthroplasty for a case series of 163 patients. However, there are limitations due to the heterogenicity of the cohort assessed, that may not be fully addressed by their regression model, and the problems of reporting survival of an augment when used in combination with total knee prosthesis.
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