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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(A,B) Parallel Schanz pins placed in the proximal and distal femur; (C,D) internal rotation of the distal segment after removal of the distal interlocking screws; (E) the smartphone application measured a 20° correction.