Document Detail

Measurement of the time course of bending of the back in the sagittal plane.
MedLine Citation:
PMID:  7749903     Owner:  NLM     Status:  MEDLINE    
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.
A P Menezes; K E Davies; D W Hukins; M I Jayson
Related Documents :
15964113 - Congenital cervical block vertebrae are associated with caudally adjacent discs.
10954643 - Mechanisms of action of lumbar supports: a systematic review.
16785183 - Control of soft tissue deformation during robotic needle insertion.
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society     Volume:  4     ISSN:  0940-6719     ISO Abbreviation:  Eur Spine J     Publication Date:  1995  
Date Detail:
Created Date:  1995-06-20     Completed Date:  1995-06-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9301980     Medline TA:  Eur Spine J     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  24-8     Citation Subset:  IM    
Department of Medical Biophysics, University of Manchester, UK.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Back / physiology*
Back Pain / physiopathology
Middle Aged
Movement / physiology*
Photography / methods*
Reproducibility of Results
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Posterior instrumentation in scoliosis.
Next Document:  Spinal mobility and posture: changes during growth with postural defects, structural scoliosis and s...