Ergonomic investigation of bent-handle fabric scissors

Abstract

BACKGROUND: The traditional design of fabric cutting scissors frequently causes excessive ulnar deviation of the wrist which, together with repetitive and long-term use of the tool, may contribute to the development of musculoskeletal problems, particularly in the upper extremities. OBJECTIVE: The aim of this study was to compare a new bent-handle fabric scissors with a traditional one. METHODS: The study investigated the effects of a new bent-handle fabric scissors on several hand performance capabilities (hand dexterity, pinch grip strength, wrist postures and hand/finger discomfort) and tool's usability (using System Usability Scale - SUS) and compared it against the effects of traditional design. RESULTS: The results indicated that the bent-handle fabric scissors was superior to the traditional design as it resulted in more neutral wrist deviation, higher usability scores and less hand/finger discomfort ratings. No significant difference was found between the two designs with regard to the hand dexterity and strength exertions. CONCLUSIONS: The findings provide evidence that the ergonomic principle of "bending the tool, not the wrist" can perhaps be employed advantageously for the design of fabric cutting scissors to reduce wrist deviations and discomfort and to improve the tool's usability.