title: Compared with magnetic resonance imaging, radiographs underestimate the magnitude of negative ulnar variance.
abstract: It is unclear how to interpret ulnar variance (UV) as determined by magnetic resonance imaging (MRI). Using a radiology database, we retrospectively assessed UV on MRI and compared it with UV on radiographs. MR images of 163 wrists (158 patients) were reviewed. Mean (SD) UV was -0.16 (2.43) mm on radiographs, -0.62 (2.41) mm on T1-weighted (bone-to-bone) MRI, and -0.50 (2.38) mm on gradient- echo or short tau inversion recovery (cartilage-to-cartilage) MRI. Compared with MRI, radiographs significantly underestimated the magnitude of negative UV. There was no difference in UV between different hand positions in MRI. Further research is needed to validate the measurement of UV on MRI and to determine its clinical utility.
authors.affiliation: South Shore Orthopedics, Hingham, MA. jkadzielski@partners.org.
authors.forename: John
authors.initials: J
authors.lastname: Kadzielski
authors.forename: Ali A
authors.initials: AA
authors.lastname: Qureshi
authors.forename: Roger
authors.initials: R
authors.lastname: Han
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yoshioka
authors.forename: Philip
authors.initials: P
authors.lastname: Blazar
mesh_terms: D000328:Adult; D006225:Hand / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D011859:Radiography; D012189:Retrospective Studies; D014457:Ulna / Q000000981:diagnostic imaging* / Q000473:pathology; D014955:Wrist Joint / Q000000981:diagnostic imaging* / Q000473:pathology