title: MR appearance of the temporal evolution and resolution of spontaneous osteonecrosis of the knee: a case report.
abstract: Spontaneous osteonecrosis of the knee (SONK) is a feared condition of unknown cause, in its classic form appearing in the medial femoral condyle in middle-aged or elderly subjects. Diagnosis with radiography is notoriously difficult with a long latency before typical changes appear. Magnetic resonance imaging (MRI) is regarded as a diagnostic tool with the possibility to give an earlier diagnosis with improved chances for treatment. However, also with MRI there may be an initial diagnostic blind spot before typical changes appear. Little is known about the temporal evolution of the MRI changes. In the current case report, a case of SONK is reported where serial imaging with MRI was performed, from initial symptoms to eventual resolution after almost three years.
authors.affiliation: Department of Radiology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden; Department of Clinical Sciences, Lund University, Lund, Sweden.
authors.forename: Mats
authors.initials: M
authors.lastname: Geijer
authors.affiliation: Department of Orthopedic Surgery, Skåne University Hospital and Lund University, Lund, Sweden.
authors.forename: Jan
authors.initials: J
authors.lastname: Jureus
authors.affiliation: Department of Radiology, Akademiska Hospital, Uppsala, Sweden.
authors.forename: Mari
authors.initials: M
authors.lastname: Hanni
authors.affiliation: Department of Radiology, Akademiska Hospital, Uppsala, Sweden.
authors.forename: Adel
authors.initials: A
authors.lastname: Shalabi
keywords: Osteonecrosis; knee; magnetic resonance imaging (MRI)