Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Rigorous Mathematical Derivation of Inclination Angle for Single Cut Rotational Osteotomy for Tibia Deformity Correction

Version 1 : Received: 8 June 2024 / Approved: 11 June 2024 / Online: 11 June 2024 (12:03:50 CEST)

How to cite: Qatu, M.; Al-Jamal, M.; Mouzaihem, H. Rigorous Mathematical Derivation of Inclination Angle for Single Cut Rotational Osteotomy for Tibia Deformity Correction. Preprints 2024, 2024060698. https://doi.org/10.20944/preprints202406.0698.v1 Qatu, M.; Al-Jamal, M.; Mouzaihem, H. Rigorous Mathematical Derivation of Inclination Angle for Single Cut Rotational Osteotomy for Tibia Deformity Correction. Preprints 2024, 2024060698. https://doi.org/10.20944/preprints202406.0698.v1

Abstract

Background: To rigorously derive easy to use formulae for the inclination angle for single cut rotation osteotomy that can be used for tibia deformity correction. Method: Three theorems were proven using trigonometric identities and concepts of linear algebra. These were rigorously shown. The three concepts were how to convert deformities in an AP/Lateral plane to an oblique plane deformity with a true angular magnitude of deformity; how to project an angular quantity from one plane to another; and the calculation of the inclination angle for the oblique osteotomy plane. All figures in this article were created by the authors of this paper. Results: From the formula derived, a statistical t-test was performed that showed no significant difference between the formula derived in this paper and the original Sangeorzan paper charts (p=0.0079). Conclusions: The formulae described in this article are a method to accurately calculate the inclination angle of the osteotomy for a single cut rotational osteotomy for tibial deformity correction. Clinical Relevance: The article gives a deeper understanding of fundamental concepts behind deformity correction and provides an easy-to-use mathematical formula to calculate the osteotomy inclination for single cut rotational osteotomies.

Keywords

osteotomy; deformity; oblique; rotation; angulation

Subject

Medicine and Pharmacology, Orthopedics and Sports Medicine

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