Two year study by the University of Rhode Island Physical Therapy Department
Synopsis: The Right Brush showed significantly less stress on the thumb area and the
many muscles of the hand using the Right Brush compared to a standard brush.
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The Right Brush’s ergonomic design is made for your hand.
PHYSICAL THERAPIST' JOY TWELVES REPORT
Using the traditional paint brush requires the wrist to be in a position of ulnar deviation (angled toward the small finger - frontal plane) while flexing and extending the wrist - sagittal plane - during the motion of painting. The elbow is crowded in toward the body making it difficult to use the larger stronger muscles of the upper arm and shoulder.
Using the new “Right Brush” allows the wrist to be in a more neutral position (no deviation) during the flexing and extending of the wrist. This places less stress on the many small joints of the wrist. In addition, this position of the wrist encourages use of the larger muscles of the upper arm and shoulder because the elbow is now able to swing free of the body (abduct). With the entire upper extremity in use, the larger stronger muscle groups of the shoulder will assist in the painting motion, thus avoiding fatigue and stress on the smaller muscles of the wrist and forearm. Repetitive stress injuries can thus be avoided.
MASTER OF SCIENCE IN PHYSICAL THERAPY, RHODE ISLAND
The Right Brush's Ergonomic Design is Made for Your Hand (PDF 2 page report)
Report from the National Institute of Occupational Safety and Health
Factsheet: Carpal Tunnel Syndrome, June 1997 - http://www.cdc.gov/niosh/ctsfs.html
What is Carpal Tunnel Syndrome (CTS)?
The carpal tunnel receives its name from the 8 bones in the wrist, called carpals, that form a tunnel like structure. The tunnel is filled with flexor tendons which control finger movement. It also provides a pathway for the median nerve to reach sensory cells in the hand. Repetitive flexing and extension of the wrist may cause a thickening of the protective sheaths which surround each of the tendons. The swollen tendon sheaths, or tenosynovitis, apply increased pressure on the median nerve and produce Carpal Tunnel Syndrome (CTS).
NIOSH recommendations for controlling carpal tunnel syndrome have focused on ways to relieve awkward wrist positions and repetitive hand movements, and to reduce vibration from hand tools. NIOSH recommends redesigning tools or tool handles to enable the user's wrist to maintain a more natural position during work.