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Radiological measurements of the wrist in intraoperative positions

Purpose: The purpose of this study was to investigate and quantify the effects of the intraoperative position on radial inclination, ulnar variance, and the position of the ulnar styloid in normal human wrists.

Methods: Plain radiographs were taken of 30 adult volunteers (15 male, 15 female) in 3 positions: a standard wrist imaging position and two different intraoperative positions (supine with the palm of the hand in contact with the cassette and supine with the dorsum of the hand in contact with the cassette).

Results: The results showed that the ulnar styloid migrated in both intraoperative positions, and radial inclination was increased in the supine position with the palm of the hand in contact, especially in males.

Conclusions: The results of this study indicate that forearm rotation in the intraoperative position may affect the accuracy of radiographic measurements. Type of study/level of evidence: Diagnostic, III

Author(s): Hidehiko Horiuchi, Hironobu Koseki, Masanori Yamaguchi, Takashi Higuchi, Hitoshi Iwanaga, Ritsu Tsujimoto, Makoto Osaki