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How Do Orthoses Impact Ease of Donning, Handwriting, Typewriting, and Transmission of Manual Torque? A Study of Three Prefabricated Wrist-Hand Orthoses (JPO033-3A)
Journal of Prosthetics and Orthotics: Volume 33, Issue 3
Keyword(s)
JPO033-3A
Introduction: Many upper-limb injuries have work-related causes such as continued use of computers, typing activities, mouse manipulation, and repetitive movements performed for long periods. This study evaluated the performance of wrist-hand orthoses in manual tasks and in transmission of torque measurement during canned glass opening.
Methods: Thirty healthy participants performed donning, typing, and handwriting tasks and transmission of manual torque. The procedures were performed in four conditions: with three different orthoses and with no orthosis as a control.
Results: The results showed a significant difference in the time of manual writing (P < 0.001) and in the number of words per minute (P < 0.001) in the typing task with and without orthoses. The perceived difficulty in performing typing (P < 0.001) and manual writing (P < 0.001) was lower with no orthoses and higher for canvas orthosis and the two neoprene orthoses. Transmission of manual torque also decreased with the orthoses compared with using no orthosis (P < 0.001). Among the orthoses, the canvas fabric orthosis yielded a lower performance compared with the two different neoprene fabric orthoses for all the tasks.
Conclusions: There are effects of the materials used and the orthosis design when performing handwriting typing tasks and twisting tasks (transmission of manual torque), as well as the correctness of how users donned the orthosis.
Methods: Thirty healthy participants performed donning, typing, and handwriting tasks and transmission of manual torque. The procedures were performed in four conditions: with three different orthoses and with no orthosis as a control.
Results: The results showed a significant difference in the time of manual writing (P < 0.001) and in the number of words per minute (P < 0.001) in the typing task with and without orthoses. The perceived difficulty in performing typing (P < 0.001) and manual writing (P < 0.001) was lower with no orthoses and higher for canvas orthosis and the two neoprene orthoses. Transmission of manual torque also decreased with the orthoses compared with using no orthosis (P < 0.001). Among the orthoses, the canvas fabric orthosis yielded a lower performance compared with the two different neoprene fabric orthoses for all the tasks.
Conclusions: There are effects of the materials used and the orthosis design when performing handwriting typing tasks and twisting tasks (transmission of manual torque), as well as the correctness of how users donned the orthosis.
Credit Information
2.0 Credits (Scientific)
Author(s)
Ana Lya M. Ferrari, MSc; Fausto O. Medola, PhD; Frode E. Sandnes, PhD
Description
The wrist plays an important role in the upper-limb movement as a connection between the forearm and the hand. Because 90% of the upper-limb function is executed by the hands, the wrist functionality is highly important. Several pathologies can affect the functionality of the upper limbs such as carpal tunnel syndrome, subacromial bursitis, and articular dysfunctions such as osteoarthritis and rheumatoid arthritis. Some of these medical conditions can result from work-related activities involving loads and repetitive movements over prolonged time intervals. Repetitive strain injuries (RSIs) are among the most frequent causes of work-related hand and wrist diseases.3 One relevant example would be the intensive use of computers that has been related to musculoskeletal disorders, especially when the duration of use exceeds 20 hrs per week. Extensive computer use is a common scenario for many people in modern life. Gerr et al. reported incidences of musculoskeletal disorders in the upper limbs after the first year of approximately 50% of employees that worked with computers.