Is the Fovea Ulnaris Truly Isometric during Forearm Rotation?—An In Vivo Retrospective Analysis Using Superimpositions of Three-Dimensional Reconstructions

The fovea ulnaris is considered to be the center of rotation on ulnar head during forearm rotation. purpose this study was investigate whether truly isometric in vivo. three-dimensional reconstruction models 21 wrist computed tomography images taken supination and pronation were investigated. superimposed so that two heads same position. Numerous points set surface with a mean distance 0.2 mm between nearest points. Then, respect radius, (DFR) measured. defined as point shortest DFR. DFR less than mm. An found three cases not 18 cases. moved (DFR center) ranged from 0.1 2.4 position radioulnar direction significantly correlated translation amount located more ulnarly when or greater. isometricity foveal insertion TFCC may consistent appears shift increasing