title: Predictive value of magnetic resonance imaging in avascular necrosis following talar fractures.
abstract: Ischemic bone necrosis following talar fractures is a problematic complication and its early diagnosis is important. Patients with Hawkins Type II and III talar fractures received internal fixation using titanium alloy screws, and chronological bone changes were observed with Magnetic Resonance Imaging (MRI). With the Type II patient, Hawkins' sign was radiographically confirmed 2 months after the surgery. Furthermore, there were no changes of MR images for 2 years and a good clinical outcome was obtained. However, in the Type III patient, Hawkins' sign was negative and MRI revealed a low signal-intensity band on the talus 2 months after the surgery and then necrosis was radiographically confirmed; pain appeared 10 months later. These 2 cases suggest that MRI is a useful means for detecting bone necrosis with talar fractures in the early post-operative period.
authors.affiliation: Department of Orthopaedic Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan.
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Kubo
authors.forename: Keishi
authors.initials: K
authors.lastname: Kamata
authors.forename: Masahiko
authors.initials: M
authors.lastname: Noguchi
authors.forename: Shigehiro
authors.initials: S
authors.lastname: Inoue
authors.forename: Motoyuki
authors.initials: M
authors.lastname: Horii
authors.forename: Mikihiro
authors.initials: M
authors.lastname: Fujioka
authors.forename: Yasusuke
authors.initials: Y
authors.lastname: Hirasawa