[Calculation of carpal-high index of normal hand]

The carpal-high index was calculated from figures measured on X-ray films of 200 normal hands of 100 healthy persons. In light of the measuring methods by Dr. Youm et al and Dr. Stahelin et al., reference points and lines were marked and drawn on radiograms taken with standard technic. The carpal-high index was 1.0. Its standard deviation was smaller than that of carpal-high ratio. The carpal-high index can be used as a scale to investigate progression or regression of unilateral carpal disease before or under treatment.