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Carpal tunnel pressure during hand maneuvers.

Authors
Rempel-DM
Source
NIOSH 1996 Dec; :1-5
Link
NIOSHTIC No.
20001006
Abstract
Static loading of the fingertip to forces of 6, 9, and 12 N significantly increased carpal tunnel pressure above a no load state. The pressures remained elevated and constant as long as the load was present. The effect of loading on carpal tunnel pressure was independent of (and additional to) the effect of wrist posture. Postures of the wrist, thumb, finger, and forearm influence carpal tunnel pressure in complicated ways. For some joints and postures the direction and magnitude of effects are consistent across the health subjects tested (N=37). When tested in combinations most of the postures were found to have an interaction effect (e.g., wrist extension and finger flexion) although some did not (eg., ulnar-radial deviation and finger flexion). Some of the relationships between carpal tunnel pressure and joint postures (e.g., forearm rotation, extension-flexion, ulnar-radial deviation) and fingertip load can be described by simple mathematical models. However, the specific equations should be used with caution because for some joints and postures the variability between subjects is high. Carpal tunnel pressure during the performance of a repetitive task is influenced in a complicated manner by the pinch force applied during the task (e.g., moving cans) and the joint postures (e.g., keyboard work). for example, during typing the pressure rises above baseline and remains elevated for as long a typing continues. the magnitude of pressure increase is strongly influenced by wrist posture deviation from neutral.
Keywords
Carpal-tunnel-syndrome; Musculoskeletal-system-disorders; Ergonomics; Arm-injuries; Chronic-inflammation; Chronic-trauma
Contact
Ergonomics Program, University of California at San Francisco, 1301 South 46th Street, building 12, Richmond, California, 94804
Publication Date
19961218
Document Type
Final Grant Report
Funding Amount
162000
Funding Type
Grant
Fiscal Year
1997
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-000121
NIOSH Division
OEP
Priority Area
Musculoskeletal-system-disorders
Source Name
National Institute for Occupational Safety and Health
State
CA
Performing Organization
Division of Environmental and Occupational Medicine, University of California at San Francisco, Richmond, California
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