University of Twente Student Theses


3D leg and knee alignment measurement methods & planning of guided correction osteotomies

Heggeler, BSc R.M. ten (2022) 3D leg and knee alignment measurement methods & planning of guided correction osteotomies.

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Abstract:Leg and knee alignment analysis related to knee disorders is currently performed in 2D, while there is an increasing interest in 3D alignment analysis (e.g. PSG usage). Furthermore, with the current 2D-alignment measurement method (2D-AMM) multiplanar leg and knee deformities cannot be analysed adequately. However, based on our systematic literature review, there is currently no consensus on a 3D-AMM for alignment parameters or coordinate systems to perform 3D alignment analysis. By use of the systematic review, a 3D-AMM was developed for 18 alignment parameters, of which the relation to the 2D-AMM was investigated. The 3D-AMM was proven superior in reproducibility to the gold standard 2D-AMM, and significant different parameter values were found between the 2D- and a 3D-AMM. Together with the high variability in reported 3D-AMMs causing different alignment parameter values between studies, 3D reference values cannot be adopted from literature or 2D. Consequently, a preoperative planned malalignment correction cannot yet be performed optimally. Nevertheless, the unanimous reproducible 3D-AMM allows for accurate leg and knee alignment analysis and correction planning in all three anatomical planes simultaneously. Together with optimal PSG criteria developed to reproduce the preoperatively planned correction, it offers perspective to achieve good long-term result for a patient.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:44 medicine, 50 technical science in general
Programme:Technical Medicine MSc (60033)
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