ABSTRACT
AIM: The main goal of this study was to asses the possibility of using mass production structured-light 3d scanner to asses human body posture. MATERIALS AND METHODS: The study was conducted on a healthy 23 year old volunteer and a lay-figure. The experiment consisted of 28 3D scans, divided into three separate tests. RESULTS: The largest deviation observed in the first two trials was 24.42 mm. While the largest deviation observed in the third trial was 49.91 mm. CONCLUSIONS: Data obtained with the mass production structured-light 3d scanner may have comparable or better performance than commercially available systems for the assessment of BP.
Subject(s)
Anthropometry/instrumentation , Imaging, Three-Dimensional/instrumentation , Light , Physical Examination/instrumentation , Posture/physiology , Adult , Anatomic Landmarks , Equipment Design , Humans , Imaging, Three-Dimensional/methods , Physical Therapy Modalities/instrumentation , Pilot Projects , Reference Values , Reproducibility of Results , Spinal Curvatures/diagnosis , Young AdultABSTRACT
The mechanism of creation and pathomechanics of lateral spinal deformation is still not fully explained. Modern medical imaging techniques give scientists possibility to understand some aspects, but vast majority of those techniques is based on static trials. A motion capture system belongs to techniques which enable visualization of a spine during dynamic trials; however, due to lack of appropriate computational model, it is unsuitable for scoliosis imaging. A few years ago our group has proposed a kinematic model of the spine to be used with Vicon Motion Capture System, which was based on Bézier curves. That model allowed for much more precise investigation of spinal kinematics during dynamic trials as compared with other computational models. However, it did not allowed to restrict only selected movements for particular segments of the spine (e.g. axial rotation for lumbar spine). The aim of the current work is to improve the proposed model in order to be able to restrict selected movements according to the knowledge concerning spinal anatomy and spinal range of motion. The new kinematic model of the spine was written in BodyBuilder for Biomechanics Language. For the purpose of visualization also an accurate graphical representation of each vertebra (polygon mesh) was computed and adapted to be compatible with the kinematic model. Using a new version of the model it is possible to perform precise analysis of movement of all vertebrae during such dynamic activities as e.g. gait and forward or lateral bending, as well as to present the results not only on the charts, but also as a 3D animation of movements of a realistically looking spine. The paper describes the new kinematic model and the process of creating graphical representation of the vertebrae. Also sample results obtained using that model are presented.
