Measurement of the time course of bending of the back in the sagittal plane
| Autor: | D. W. L. Hukins, K. E. Davies, M. I. V. Jayson, A. P. Menezes |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Adult
Male Time Factors Movement Kinematics Bending Displacement (vector) Position (vector) Photography medicine Humans Orthopedics and Sports Medicine Plumb bob Aged Back Reproducibility business.industry Reproducibility of Results Middle Aged Flashing Geodesy Sagittal plane medicine.anatomical_structure Back Pain Surgery business |
| Zdroj: | European Spine Journal. 4:24-28 |
| ISSN: | 1432-0932 0940-6719 |
| DOI: | 10.1007/bf00298414 |
| Popis: | A simple, inexpensive method has been developed for measuring the position of the back, projected onto the sagittal plane, during flexion. Light-emitting diodes (LEDs) were attached to the skin overlying the T6, L1, L3 and L5 vertebrae. They started to flash, at a controlled frequency, at the beginning of movement from an upright to a flexed position. The positions of the markers together with the initial (upright) and final (flexed) positions of the back were recorded on a single photograph. A plumb line provided a vertical reference. Times were determined from the flashing frequency. Vertical and horizontal components of the position were measured from the photograph; their resultant represented total displacement at a given instant in time. The results were scaled so that the displacements were expressed as a fraction of their maximum value, and time was expressed as a fraction of the total movement time. The reproducibility of the technique was tested by making repeated measurements from a single healthy volunteer. At any instant, the horizontal, vertical and resultant displacements of the T6 marker could be determined to within 7% of their maximum values; the resultant displacement of the L5 marker could be determined to within 10%. The results from the other markers were less reliable. |
| Databáze: | OpenAIRE |
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