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Femoral anatomical frame: assessment of various definitions

Della Croce, Ugo and Camomilla, Valentina and Leardini, Alberto and Cappozzo, Aurelio (2003) Femoral anatomical frame: assessment of various definitions. Medical Engineering and Physics, Vol. 25 (5), p. 425-431. eISSN 1873-4030. Article.

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DOI: 10.1016/S1350-4533(03)00032-8


The reliability of the estimate of joint kinematic variables and the relevant functional interpretation are affected by the uncertainty with which bony anatomical landmarks and underlying bony segment anatomical frames are determined. When a stereo-photogrammetric system is used for in vivo studies, minimising and compensating for this uncertainty is crucial. This paper deals with the propagation of the errors associated with the location of both internal and palpable femoral anatomical landmarks to the estimation of the orientation of the femoral anatomical frame and to the knee joint angles during movement. Given eight anatomical landmarks, and the precision with which they can be identified experimentally, 12 different rules were defined for the construction of the anatomical frame and submitted to comparative assessment. Results showed that using more than three landmarks allows for more repeatable anatomical frame orientation and knee joint kinematics estimation. Novel rules are proposed that use optimization algorithms. On the average, the femoral frame orientation dispersion had a standard deviation of 2, 2.5 and 1.5 ° for the frontal, transverse, and sagittal plane, respectively. However, a proper choice of the relevant construction rule allowed for a reduction of these inaccuracies in selected planes to 1 ° rms. The dispersion of the knee adduction-abduction and internal-external rotation angles could also be limited to 1 ° rms irrespective of the flexion angle value.

Item Type:Article
ID Code:6950
Uncontrolled Keywords:Movement analysis, stereophotogrammetry, anatomical landmarks, anatomical frames, precision, joint kinematics
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-INF/06 Bioingegneria elettronica e informatica
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze biomediche
Copyright Holders:© 2003 IPEM
Deposited On:12 Jan 2012 14:00

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