Measurement of an intact knee kinematics using gait and fluoroscopic analysis

Abstract

A method has been introduced in this paper to measure the kinematics of a knee joint and to use it as a boundary condition to model the knee's mechanical behaviour. A mobile C-Arm fluoroscopy system (Ziehm Vision R) and a CCD camera were used for the measurement of a patient's knee kinematics. The fluoroscopic images were recorded with 12 fps and then sent to Matlab software (Mathworks, Natick, MA, USA) for image processing. In parallel, CT scan images of the knee bones were used to create the 3D anatomical geometry of the knee by aid of Mimics software (Materialise NV). However, the geometrical model of the two medial and lateral menisci was generated from MRI data. The 3D geometrical model of the knee was then sent to Abaqus finite element software (Simulia Dassault Systems) to analyse the knee joint contact loads by introducing the boundary condition which was obtained from fluoroscopic images. The finite element model was used to evaluate the stress distribution on the cartilages during the gait. The result was then compared with the experimental data of gait analysis. The comparison between the results showed a close agreement between the two outcomes.

Implementation of a gait cycle loading into healthy and meniscectomised knee joint models with fibril-reinforced articular cartilage

“…Currently, very few FE studies report knee joint stresses and strains which have been evaluated during a gait cycle (although Yang et al 2010;Netravali et al 2011;Saveh et al 2011 have done so). However, those models lack a realistic material characterisation of cartilage, i.e.…”

“…However, those models lack a realistic material characterisation of cartilage, i.e. cartilage tissue has been considered to be a linear elastic and isotropic material (Yang et al 2010;Netravali et al 2011) or even rigid (Saveh et al 2011). In reality, cartilage tissue includes strain-and timedependent material properties, caused by the collagen fibrils, fluid and proteoglycans (PGs).…”

The KneeKG system: a review of the literature

“…A number of assessment tools frequently utilized in orthopedic research (pivot-shift analyzer [16], various rotatory assessment devices [3,19], gait assessment [27]) meet these requirements of precision, reproducibility, and objectivity that are often lacking in manual examination. In spite of these advantages, adaptation of such techniques from the laboratory into clinical practice has been slow and difficult, particularly in regard to gait analysis [29].…”

In vivo Kinematics Assessment of Bulged Disk Cervical Vertebral

“…The extracting 3D motion from the 2D radiograph is performed based on a technique which matches the single-plane X-ray imaging with 3D models. The kinematic measurements using this method comes with sufficient accuracy based on the precision of registration technique [8], The current study uses a fluoroscopic scanning method along with registration technique of a single-plane image to the 3D model [6,9] to obtain in-vivo dynamic CT data.In previous study, Anderst et al [10] have collected data from 19 healthy subjects in their research. They have created a three dimensional (3D) model of each vertebra from the segmented bone tissue using CT data.…”

“…The cervical spine's CT data was obtained for each patient with slice thickness 0.6 (mm). Using the DICOME files of the CT data, the cervical bones were segmented using Mimics (Materialise, Leuven, Belgium) commercial software [8,12]. The segmentation process was performed on CT gray scaled images using a thresholding algorithm.…”