Rotation in the interphalangeal thumb joint in vivo.
PURPOSE: To investigate rotation at the thumb interphalangeal (IP) joint in vivo to optimize the position of fusion of this joint. METHODS: Standardized photographs were taken of 176 thumbs end-on (88 asymptomatic volunteers) placed on a custom-made splint with the IP joint at 40 degrees . Three blinded investigators measured rotation at the IP joint from these photographs as the angle between a line aligning the eponychial folds and a line aligning the proximal phalanx condyles. Gender, age...Expand abstract
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