title: Reliability and Validity of the Footprint Assessment Method Using Photoshop CS5 Software.
abstract: BACKGROUND
  Several sophisticated methods of footprint analysis currently exist. However, it is sometimes useful to apply standard measurement methods of recognized evidence with an easy and quick application. We sought to assess the reliability and validity of a new method of footprint assessment in a healthy population using Photoshop CS5 software (Adobe Systems Inc, San Jose, California).
  
  
  METHODS
  Forty-two footprints, corresponding to 21 healthy individuals (11 men with a mean ± SD age of 20.45 ± 2.16 years and 10 women with a mean ± SD age of 20.00 ± 1.70 years) were analyzed. Footprints were recorded in static bipedal standing position using optical podography and digital photography. Three trials for each participant were performed. The Hernández-Corvo, Chippaux-Smirak, and Staheli indices and the Clarke angle were calculated by manual method and by computerized method using Photoshop CS5 software. Test-retest was used to determine reliability. Validity was obtained by intraclass correlation coefficient (ICC).
  
  
  RESULTS
  The reliability test for all of the indices showed high values (ICC, 0.98-0.99). Moreover, the validity test clearly showed no difference between techniques (ICC, 0.99-1).
  
  
  CONCLUSIONS
  The reliability and validity of a method to measure, assess, and record the podometric indices using Photoshop CS5 software has been demonstrated. This provides a quick and accurate tool useful for the digital recording of morphostatic foot study parameters and their control.
authors.forename: Lourdes
authors.initials: L
authors.lastname: Gutiérrez-Vilahú
authors.forename: Núria
authors.initials: N
authors.lastname: Massó-Ortigosa
authors.forename: Lluís
authors.initials: L
authors.lastname: Costa-Tutusaus
authors.forename: Myriam
authors.initials: M
authors.lastname: Guerra-Balic
mesh_terms: D000886:Anthropometry / Q000379:methods*; D005260:Female; D005528:Foot / Q000033:anatomy & histology* / Q000502:physiology; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D011187:Posture / Q000502:physiology*; D011312:Pressure; D015203:Reproducibility of Results; D012984:Software; D055815:Young Adult