Document Detail

Use of the iPhone for Cobb angle measurement in scoliosis.
MedLine Citation:
PMID:  22065167     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The Cobb technique is the universally accepted method for measuring the severity of spinal deformities. Traditionally, Cobb angles have been measured using protractor and pencil on hardcopy radiographic films. The new generation of mobile 'smartphones' make accurate angle measurement possible using an integrated accelerometer, providing a potentially useful clinical tool for assessing Cobb angles. The purpose of this study was to compare Cobb angle measurements performed using a smartphone and traditional protractor in a series of 20 adolescent idiopathic scoliosis patients.
METHODS: Seven observers measured major Cobb angles on 20 pre-operative postero-anterior radiographs of Adolescent Idiopathic Scoliosis patients with both a standard protractor and using an Apple iPhone. Five of the observers repeated the measurements at least a week after the original measurements.
RESULTS: The mean absolute difference between pairs of smartphone/protractor measurements was 2.1°, with a small (1°) bias toward lower Cobb angles with the iPhone. 95% confidence intervals for intra-observer variability were ±3.3° for the protractor and ±3.9° for the iPhone. 95% confidence intervals for inter-observer variability were ±8.3° for the iPhone and ±7.1° for the protractor. Both of these confidence intervals were within the range of previously published Cobb measurement studies.
CONCLUSIONS: We conclude that the iPhone is an equivalent Cobb measurement tool to the manual protractor, and measurement times are about 15% less. The widespread availability of inclinometer-equipped mobile phones and the ability to store measurements in later versions of the angle measurement software may make these new technologies attractive for clinical measurement applications.
Matthew Shaw; Clayton J Adam; Maree T Izatt; Paul Licina; Geoffrey N Askin
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Publication Detail:
Type:  Journal Article     Date:  2011-11-09
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:  21     ISSN:  1432-0932     ISO Abbreviation:  Eur Spine J     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-06-04     Completed Date:  2012-10-01     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  9301980     Medline TA:  Eur Spine J     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1062-8     Citation Subset:  IM    
Paediatric Spine Research Group, Queensland University of Technology and Mater Health Services, Brisbane, Australia.
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MeSH Terms
Cellular Phone*
Scoliosis / diagnosis*
Spine / abnormalities*

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

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