[Results] Left-handers wrote with the wrist flexion of 2.92 (±9.42) degrees. Right-handers wrote with wrist extension of 8.42 (±2.80) degrees. The degree of wrist flexion during writing was significantly higher for left-handers
than right-handers. [Conclusion] When a left-handed person writes, the degree of wrist flexion is greater than that
of a right-handed person. To protect the wrist from excessive flexion and to maintain wrist stability, it is necessary
to use an instrument that is designed for left-handed persons.
Key words:
Ergonomics design, Hand function, Left-hander