ABSTRACT
Compared with a conventional keyboard, the results from Marklin’s et al. (1999) study indicate that split fixedangle and split adjustable-angle keyboards reduced mean ulnar deviation of the right and left wrists. The split adjustable-angle keyboard reduced mean, maximum and minimum ulnar deviations by ~8º compared with the conventional keyboard. Compared with the conventional keyboard, the split adjustable-angle keyboard decreased mean ulnar angle from 13.3 to 5.7º for the left wrist and 10.7 to 2.5º for the right wrist. These differences in mean, maximum and minimum ulnar deviation were statistically significant. The split fixed-angle keyboard reduced mean, maximum and minimum ulnar deviation angles significantly by ~10º (mean left wrist: 16.5 to 5.8º; mean right wrist: 7.9º ulnar to 1.2º radial). Note that for all keyboards ulnar deviation of the right wrist was significantly less than the left wrist. This difference ranged from 3 to 7º.
