Animation of in vitro biomechanical tests

Cripton, Peter A.; Sati, M.; Orr, Tracy E.; Bourquin, Yvan; Dumas, Geneviève; Nolte, Lutz P.

doi:10.1016/s0021-9290(01)00054-9

Cited by 24 publications

(29 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The helical axes of motion of the spine have mostly been averaged over large displacements [5,8,12,13,14,15,16,19,22,23]. In these cases, the stochastic calculation error, which is inversely proportional to the displacement magnitude, is small [3,23], whereas the deterministic error is large.…”

mentioning

confidence: 99%

Finite helical axes of motion are a useful tool to describe the three-dimensional in vitro kinematics of the intact, injured and stabilised spine

et al. 2004

View full text Add to dashboard Cite

IntroductionKinematical methods are widely used to describe the function of the healthy spine, the effect of degeneration or trauma, or the quality of treatment procedures. For in vitro experiments on the spine, usually three angles are reported, typically Cardanic/Eulerian angles or projection angles. Prerequisite for a description of these is a predefined, anatomical coordinate system. The coordinate system generally used for the study of the spine spans the frontal, sagittal and transverse planes. The three Cardanic/ Abstract The finite helical-axes method can be used to describe the three-dimensional in vitro kinematics of the spine. However, this method still suffers from large stochastic calculation errors and poorly conceived visualisation techniques. The aim of the present study, therefore, was to improve the currently used finite helical axes description, by use of a less error-prone calculation algorithm and a new visualisation technique, and to apply this improved method to the study of the threedimensional in vitro kinematics of the spine. Three-dimensional, continuous motion data of spinal motion segments were used to calculate the position and orientation of the finite helical axes (FHAs). The axes were then projected on plane antero-posterior, lateral and axial radiographs in order to depict the relation to the anatomy of each individual specimen. A hinge joint was used to estimate the measurement error of data collection and axes calculation. In an exemplary in vitro experiment, this method was used to demonstrate the ability of a prosthetic disc nucleus to restore the three-dimensional motion pattern of lumbar motion segments.In the validation experiment with the hinge joint, the calculated FHAs were lying within ±2.5 mm of the actual joint axis and were inclined relative to this axis at up to ±1.5°. In the exemplary in vitro experiment, the position and orientation of the FHAs of the intact specimens were subject to large inter-individual differences in all loading directions. Nucleotomy of the lumbar segments caused the axes to spread out, indicating complex coupled motions. The implantation of the prosthetic disc nucleus, for the most part, more than reversed this effect: the axes became oriented almost parallel to each other. The experiments showed that the present improved description of finite helical axes is a valid and useful tool to characterise the three-dimensional in vitro kinematics of the intact, injured and stabilised spine. The main advantage of this new method is the comprehensive visualisation of joint function with respect to the individual anatomy.

show abstract

mentioning

confidence: 99%

Finite helical axes of motion are a useful tool to describe the three-dimensional in vitro kinematics of the intact, injured and stabilised spine

et al. 2004

View full text Add to dashboard Cite

show abstract

“…This technique produces accurate animations of complex dynamic joint motions and geometries, using commercial software. Other published methods have examined static positions and passive motions, or require custom software (Cripton et al, 2001;Dennis et al, 1996). The minimum interbone distances supplement the animations by quantifying the joint gap.…”

Section: Discussionmentioning

confidence: 99%

“…In vitro 3D animations and models have been based on motion of the forearm at various static positions (Fischer et al, 2001), dynamic vertebral motion (Cripton et al, 2001), passive motion of extremities (Van Sint Jan et al, 2002), and passive motion of carpal bones (Patterson et al, 1998). In vivo motions have been modeled using biplanar radiographs at static joint angles (Asano et al, 2001), high-speed biplanar radiographs in a canine (You et al, 2001), and 3D model fitting of fluoroscopic videos (Dennis et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional modeling and animation of two carpal bones: a technique

Green

Werner

Wang

et al. 2004

Journal of Biomechanics

View full text Add to dashboard Cite

“…This approach considers rotations covering all six degrees of freedom but does not depend on any predefined coordinate system (Woltring et al , 1985). Thus, HA defines a movement of a rigid body by reducing it into a rotation about and translation along a single axis (Cripton et al , 2001). The HA location can be computed for any portion of movement defined by a given start and end position.…”

Section: Introductionmentioning

confidence: 99%

Can parameters of the helical axis be measured reliably during active cervical movements?

Barbero

Falla

Clijsen

et al. 2017

Musculoskeletal Science and Practice

View full text Add to dashboard Cite

Convex hull area (CHA) and mean angle (MA) have been proposed to describe the behaviour of the helical axis during joint kinematics. This study investigates the intra-and inter-session reliability of CHA and MA during active movements of the cervical spine. Twenty-seven healthy volunteers (19 women) aged 23±2.8 years participated. Each volunteer was tested on two sessions. All participants were instructed to perform the following active movements of the cervical spine: rotation, flexion/extension and lateral bending, each performed to full range and repeated ten consecutive times. Cervical movements were registered with an electromagnetic tracking system. For each participant, each movement and each session, range of motion (ROM), CHA and MA were extracted. ROM showed high intra-and inter-session reliability during all cervical spine movements using this method. Overall, the intra-and inter-session reliability of the helical axis parameters varied depending on the movement direction and ranged from fair to almost perfect. The intra-and inter-session reliability of CHA and MA were almost perfect during rotation whereas the intra-and inter-session reliability of CHA was substantial during lateral bending and intra-and inter-session reliability of MA ranged from fair to substantial during flexion/extension and lateral bending. This is the first study to evaluate the reliability of helical axis measures during active movements of the cervical spine. The results show that CHA and MA are promising descriptors of cervical kinematics which could be applied in future studies to evaluate neck function in patients with cervical spine disorders.

show abstract

Animation of in vitro biomechanical tests

Cited by 24 publications

References 14 publications

Finite helical axes of motion are a useful tool to describe the three-dimensional in vitro kinematics of the intact, injured and stabilised spine

Finite helical axes of motion are a useful tool to describe the three-dimensional in vitro kinematics of the intact, injured and stabilised spine

Three-dimensional modeling and animation of two carpal bones: a technique

Can parameters of the helical axis be measured reliably during active cervical movements?

Contact Info

Product

Resources

About