title: An analysis of functional shoulder movements during task performance using Dartfish movement analysis software.
abstract: OBJECTIVE
  Video-based movement analysis software (Dartfish) has potential for clinical applications for understanding shoulder motion if functional measures can be reliably obtained. The primary purpose of this study was to describe the functional range of motion (ROM) of the shoulder used to perform a subset of functional tasks. A second purpose was to assess the reliability of functional ROM measurements obtained by different raters using Dartfish software.
  
  
  METHODS
  Ten healthy participants, mean age 29 ± 5 years, were videotaped while performing five tasks selected from the Disabilities of the Arm, Shoulder and Hand (DASH). Video cameras and markers were used to obtain video images suitable for analysis in Dartfish software. Three repetitions of each task were performed. Shoulder movements from all three repetitions were analyzed using Dartfish software. The tracking tool of the Dartfish software was used to obtain shoulder joint angles and arcs of motion. Test-retest and inter-rater reliability of the measurements were evaluated using intraclass correlation coefficients (ICC).
  
  
  RESULTS
  Maximum (coronal plane) abduction (118° ± 16°) and (sagittal plane) flexion (111° ± 15°) was observed during 'washing one's hair;' maximum extension (-68° ± 9°) was identified during 'washing one's own back.' Minimum shoulder ROM was observed during 'opening a tight jar' (33° ± 13° abduction and 13° ± 19° flexion). Test-retest reliability (ICC = 0.45 to 0.94) suggests high inter-individual task variability, and inter-rater reliability (ICC = 0.68 to 1.00) showed moderate to excellent agreement.
  
  
  CONCLUSIONS
  KEY FINDINGS INCLUDE: 1) functional shoulder ROM identified in this study compared to similar studies; 2) healthy individuals require less than full ROM when performing five common ADL tasks 3) high participant variability was observed during performance of the five ADL tasks; and 4) Dartfish software provides a clinically relevant tool to analyze shoulder function.
authors.affiliation: School of Physical Therapy, University of Western Ontario, London, Ontario, Canada.
authors.forename: Leenesh
authors.initials: L
authors.lastname: Khadilkar
authors.affiliation: Co-Director, Clinical Research Lab, Hand and Upper Limb Centre, St Joseph's Health Centre, London ; Professor, School of Rehabilitation, McMaster University, Hamilton, Ontario, Canada.
authors.forename: Joy C
authors.initials: JC
authors.lastname: MacDermid
authors.affiliation: School of Rehabilitation Sciences, McMaster University, Hamilton, Ontario, Canada.
authors.forename: Kathryn E
authors.initials: KE
authors.lastname: Sinden
authors.affiliation: Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario, Canada ; Co-Director, Wolf Orthopaedic Biomechanics Lab, Fowler Kennedy Sport Medicine Clinic, London, Ontario, Canada.
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Jenkyn
authors.affiliation: Co-Director, Wolf Orthopaedic Biomechanics Lab, Fowler Kennedy Sport Medicine Clinic, London, Ontario, Canada ; School of Physical Therapy, University of Western Ontario, London, Ontario, Canada.
authors.forename: Trevor B
authors.initials: TB
authors.lastname: Birmingham
authors.affiliation: Hand and Upper Limb Centre, St Joseph's Health Centre, London, Ontario, Canada.
authors.forename: George S
authors.initials: GS
authors.lastname: Athwal
keywords: DASH; Dartfish; functional range of motion; reliability; shoulder