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Quantifying Thumb Opposition Utilizing a Video Technique

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ABSTRACT

Thumb rotation is an essential component of circumduction needed to achieve pulp-to-pulp contact. To evaluate opponensplasty, a special device was developed to quantify thumb rotation. This new technique, using a special jig to hold the hand and video analysis, is described.

Twenty-seven healthy volunteers (12 females and 15 males) were tested to obtain normative data. Thumb rotation was measured as the difference in angle between the thumb in abduction and extension and maximal circumduction. Rotation angles varied from 70º-110º. No gender or right/left differences in rotation angles were detected.

Comparing rotation of the noninjured to the injured hand in evaluating opponensplasty can be used as an accurate measurement of thumb circumduction and opposition. The new, noninvasive technique presented offers quantitative data.