The Study: Postural spinal balance defined by net intersegmental moments: Results of a biomechanical approach and experimental errors measurement.
- The authors were trying to look at the error in measurement when "analyzing Human posture through sagittal intersegmental moments."
- The use of three dimensional imaging methods has improved the ability to measure posture.
- But radiographs may not always represent the true alignment of the patient.
- "Postural evaluation is commonly performed using full-spine radiographs."
- They used two volunteers.
- The data was collected "during three different sessions with one week interval".
- 36 markers were attached to a subject and then the subject was placed in a free standing position and the location of these markers was determined using an optoelectronic system with infrared cameras. Their feet were also positioned on force plates.
- After this had been done in a free standing posture it was done in a "radiographic" posture. In other words, the standing upright posture that would be used in a full-spine radiograph.
- Each session consisted of 4 times of standing in the free standing position and data was collected during several seconds (there was a walk between each collection) and then data was collected for one time in the "radiographic" posture.
- "Analysis between free standing and "radiographic" posture was done by comparison of mean spinal net moments..."
- "For one volunteer the 'radiographic' posture was associated to significant changes compared to the free standing position."
- The authors concluded that using this method was technically feasible. They felt that "postural variability over time" was more of an error than any problem with the method of measurement.
This is an effort to look at a method to obtain information regarding posture that does not include imaging.
This is an article which is interested in postural alignment. The authors feel this is important because, as they note in the introduction, multiple studies have shown correlations between Health Related Quality of Life scores and sagittal radiographic parameters. Although interesting for researchers it appears to be too complex for ordinary use in the average clinical setting.
Reviewer: Roger Coleman DC
Editor’s Comments: While I understand the reason for the study, I hope our readers will intuitively realize that they already have at their disposal the most accurate method available for measuring postural balance…spinal radiography.
Editor: Mark R. Payne DC
Reference: Blondel B, Viehweger E, Moal B, Tropiano P, Jouve JL, Lafage V, Dumas R, Fuentes S, Bollini G, Pomero V. Postural spinal balance defined by net intersegmental moments: Results of a biomechanical approach and experimental errors measurement. See comment in PubMed Commons belowWorld J Orthop 2015 Dec 18;6(11):983-90. doi: 10.5312/wjo.v6.i11.983. eCollection 2015 Dec 18.
Link to Abstract: https://www.ncbi.nlm.nih.gov/pubmed/26716095