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Comput Methods Biomech Biomed Engin. 2016;19(5):484-92. doi: 10.1080/10255842.2015.1042464. Epub 2015 Jul 24.

Comparison of three formal methods used to estimate the functional axis of rotation: an extensive in-vivo analysis performed on the knee joint.

Author information

1
a Laboratorio di Biomeccanica e Innovazione Tecnologica, Istituto Ortopedico Rizzoli , Via di Barbiano 1/10, 40136 Bologna , Italy.
2
b Laboratorio di NanoBiotecnologie - NaBi, Istituto Ortopedico Rizzoli , Via di Barbiano 1/10, 40136 Bologna , Italy.
3
c The BioRobotics Institute, Scuola Superiore Sant'Anna , Pisa , Italy.
4
d Dipartimento di Ingegneria dell'Informazione , Università degli Studi di Brescia , Via Branze 38, 25123 Brescia , Italy.

Abstract

Estimating the main axis of rotation (AoR) of a human joint represents an important issue in biomechanics. This study compared three formal methods used to estimate functional AoR, namely a cylindrical fitting method, a mean helical axis transformation, and a symmetrical axis approach. These methods were tested on 106 subjects undergoing navigated total knee arthroplasty. AoR orientation in 3D and in the frontal and coronal planes provided by each method was compared to the transepicondylar axis direction. Although all the methods resulted effective, significant differences were identified among them, relatively to the orientation in 3D and in the frontal plane projection. This was probably due to the presence of secondary rotations during the first degrees of knee flexion.

KEYWORDS:

cylindrical fitting method; functional axis; knee kinematics; mean helical axis; navigated TKA; symmetrical axis approach

PMID:
26207419
DOI:
10.1080/10255842.2015.1042464
[Indexed for MEDLINE]

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