Qingyuan LI, Jay Hoon PARK, Yohan LEE, Jihyeung KIM, Kee Jeong BAE, Goo Hyun BAEK

Measurement of compensatory wrist joint rotation using three-dimensional motion analysis in patients with unilateral proximal congenital radioulnar synostosis

Objective: This study aims to investigate compensatory rotational movements of the wrist joint in patients with proximal congenital radioulnar synostosis (CRUS), using a valid and reliable three-dimensional (3D) motion analysis technique.Methods: A total of 26 patients (6 females, 14 males; mean age=15.3 years; and age range=6-32 years) who were diagnosed withunilateral proximal CRUS but were not operated were enrolled in this study. Patients were then categorized into 2 groups: GroupI included 5 patients younger than 10 years, and Group II included 15 patients older than 10 years. Eighteen light-reflective skinmarkers were placed on the bony landmarks of both upper limbs, and both distal forearms were fixed using a U-shaped device tominimize forearm rotation. Each patient grasped the handle of an instrument that used a goniometer to measure wrist rotation;maximal passive pronation and supination angles of the wrist were measured in this manner and also using 3D motion analysis.Results: There was a significant correlation between measurements by the goniometer and 3D motion analysis (r=0.985, p

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