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Measurements of wrist and finger postures: a comparison of goniometric and motion capture techniques.

Authors
Cook-JR; Baker-NA; Cham-R; Hale-E; Redfern-MS
Source
J Appl Biomech 2007 Feb; 23(1):70-78
NIOSHTIC No.
20032311
Abstract
A marker-based kinematic hand model to quantify finger postures was developed and compared to manual goniometric measurements. The model was implemented with data collected from static postures of five subjects. The metacarpal phalangeal (MCP) and proximal interphalangeal (PIP) joints were positioned in flexion of approximately 30, 60, and 90 degrees for 5 subjects. Wrist flexion/extension and ulnar/radial deviations were also examined. The model-based angles for the MCP and PIP joints were not statistically equivalent to the goniometric measurements, with differences of -1.8 degrees and +3.5 degrees, respectively. Differences between the two measurement methods for the MCP and PIP were found to be a function of the posture (i.e., 150, 120, or 90 degree blocks) used. Wrist measurements differed by -4.0 degrees for ulnar/radial deviation and +5.2 degrees for flexion/extension. Much of the difference between the model and goniometric measurements is believed due to inaccuracies in the goniometric measurements. The proposed model is useful for future investigations of finger-intensive activities by supplying accurate and unbiased measures of joint angles.
Keywords
Posture; Risk-analysis; Safety-monitoring; Musculoskeletal-system-disorders; Risk-factors; Safety-practices; Ergonomics; Biomechanics; Models; Biomechanical-modeling; Skeletal-movement
Contact
Department of Occupational Therapy, University of Pittsburgh, School of Health and Rehabilitation Sciences, 5012 Forbes Tower, University of Pittsburgh, Pittsburgh, PA 15260
CODEN
JABOEG
Publication Date
20070201
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-007826
Issue of Publication
1
ISSN
1065-8483
Source Name
Journal of Applied Biomechanics
State
PA
Performing Organization
University of Pittsburgh
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