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2D3Dpitching
- 1. 2D vs. 3D motion analysis: The Baseball Pitcher Billy Reilly MSPT, CSCS
- 2. Problem • Currently gold standard is 3D motion capture(ie Cortex) but not easily accessible to population • 2D analysis available and cost effective but only small amount of studies study validity and even smaller percentage on baseball. • Standard parameters set are based on 3D capture and marker positions
- 3. Gap in Knowledge • How does 2D analysis(Dartfish) compare to 3D analysis during pitching? • Is 2D analysis valid/reliable? • Saggital • Frontal • Transverse • If it is, can parameters set by 3D apply to 2D?
- 4. Purpose • To determine intra and inter rater reliability of 2D capture on pitchers • Determine what the reliable measures are and create set parameters for others to follow
- 5. Study Aim • Compare measures to see what is reliable • Determine if we can feasibly set parameters based off 2D.
- 6. Proposed Methods • 2-3 raters measuring with Dartfish videos obtained here in lab(measure/re-measure) • Compare inter/intrarater reliability • If certain measurements can be reliably obtained- catalog measurements to determine trends/parameters
- 8. Video analysis software increases the interrater reliability of video gait assessments in children with cerebral palsy S. Borel, P. Schneider, C.J. Newman * Gait & Posture 33 (2011) 727–729 • Shows good inter/intra-rater reliability • Only sagittal measurements • Small sample size • Not Baseball Specific
- 9. The evaluation of an inexpensive, 2D, video based gait assessment system for clinical use U. Chris Ugbolue, Valerie M. Pomeroy, Enrica Papi, Philip J. Rowe, Konstantinos T. Kaliarntas, Andrew Kerr, Leo Earl Gait & Posture 38 (2013) 483–489 • Good intra/interrater reliability • Only sagittal plane • Small sample size • Does show good correlation between 2D and 3D • States multiplanar measurements difficult to capture
- 10. An analysis of functional shoulder movements during task performance using Dartfish movement analysis software Leenesh Khadilkar, Joy C. MacDermid, Kathryn E. Sinden, Thomas R. Jenkyn, Trevor B. Birmingham, and George S. Athwal Int J Shoulder Surg. 2014 Jan-Mar; 8(1): 1–9. • Moderate to good inter/intrarater reliability • Small sample size • Does not use anatomical landmarks for marker placement. (perhaps helpful for multisegment motions, i.e. thoracolumbar ext in combo with shoulder flexion. Does not appear as reliable
- 11. Reliability of 2-Dimensional Video Assessment of Frontal-Plane Dynamic Knee Valgus During Common Athletic Screening Tasks Allan Munro, Lee Herrington, and Michael Carolan Journal of Sport Rehabilitation, 2012, 21, 7-11 • Good intra/interrater reliability in frontal plane • Does not measure in tranverse or sagittal plane • Not baseball specific
- 12. Concurrent validity and reliability of two- dimensional video analysis of hip and knee joint motion during mechanical lifting Beth S Norris, PT, OCS, PhD, and Sharon L Olson, PT, PhD Physiotherapy Theory and Practice, 27(7):521–530, 2011 • High reliability and validity of sagittal measurements of hip and knee flexion • Small sample size • Only sagittal
- 13. Current Research • These Studies help support use of 2D analysis in sagittal and frontal plane • Multi-planar and transverse planes not supported or measured. • Some maybe be measuring dynamic multijoint motions but not baseball specific
- 14. Objectives • Determine validity of measures between 2D and 3D analysis • Determine reliability between raters • Develop set parameters with 2D analysis to provide a quicker, more cost effective way to measure pitching mechanics