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A method for measuring joint kinematics designed for accurate registration of kinematic data to models constructed from CT data.

Abstract：

:A method for measuring three-dimensional kinematics that incorporates the direct cross-registration of experimental kinematics with anatomic geometry from Computed Tomography (CT) data has been developed. Plexiglas registration blocks were attached to the bones of interest and the specimen was CT scanned. Computer models of the bone surface were developed from the CT image data. Determination of discrete kinematics was accomplished by digitizing three pre-selected contiguous surfaces of each registration block using a three-dimensional point digitization system. Cross-registration of bone surface models from the CT data was accomplished by identifying the registration block surfaces within the CT images. Kinematics measured during a biomechanical experiment were applied to the computer models of the bone surface. The overall accuracy of the method was shown to be at or below the accuracy of the digitization system used. For this experimental application, the accuracy was better than +/-0.1mm for position and 0.1 degrees for orientation for linkage digitization and better than +/-0.2mm and +/-0.2 degrees for CT digitization. Surface models of the radius and ulna were constructed from CT data, as an example application. Kinematics of the bones were measured for simulated forearm rotation. Screw-displacement axis analysis showed 0.1mm (proximal) translation of the radius (with respect to the ulna) from supination to neutral (85.2 degrees rotation) and 1.4mm (proximal) translation from neutral to pronation (65.3 degrees rotation). The motion of the radius with respect to the ulna was displayed using the surface models. This methodology is a useful tool for the measurement and application of rigid-body kinematics to computer models.

journal_name

J Biomech

journal_title

Journal of biomechanics

authors

Fischer KJ,Manson TT,Pfaeffle HJ,Tomaino MM,Woo SL

doi

10.1016/s0021-9290(00)00195-0

keywords:

subject

Has Abstract

pub_date

2001-03-01 00:00:00

pages

377-83

issue

eissn

0021-9290

issn

1873-2380

pii

S0021929000001950

journal_volume

pub_type

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A method for measuring joint kinematics designed for accurate registration of kinematic data to models constructed from CT data.