title: [The MR tomography of avascular necrosis of bone: the primary findings and the follow-up observations after core decompression].
abstract: OBJECTIVE
  To assess the signal changes of avascular bone necrosis after core decompression.
  
  
  METHODS
  17 patients with avascular epiphyseal necrosis were examined by MRI using T1-weighted spin echo sequences before and after gadopentetate dimeglumine application, T2-weighted spin echo sequences and in some patients with fat-saturated 2D gradient echo sequences up to 22 months after core decompression.
  
  
  RESULTS
  All patients but one recovered from symptoms after core decompression. Although the signal morphology of the necrotic area remained unchanged in the majority of the cases, a decrease of the joint effusion was observed as well as an ongoing signal increase after gadopentetate dimeglumine application. The last examinations displayed similar signal characteristics as on the preoperative scans; however, a reduction of the necrotic zone became evident.
  
  
  CONCLUSIONS
  The decrease of joint effusion indicates successful core decompression, while a persistent signal increase after gadopentetate dimeglumine application reflects the viability of the necrotic area as well as an ongoing healing process.
authors.affiliation: Klinik für Radiologische Diagnostik, RWTH Aachen.
authors.forename: G
authors.initials: G
authors.lastname: Adam
authors.forename: P
authors.initials: P
authors.lastname: Keulers
authors.forename: J
authors.initials: J
authors.lastname: Forst
authors.forename: J
authors.initials: J
authors.lastname: Neuerburg
authors.forename: M
authors.initials: M
authors.lastname: Kilbinger
authors.forename: R W
authors.initials: RW
authors.lastname: Günther
mesh_terms: D000328:Adult; D000368:Aged; D001853:Bone Marrow / Q000601:surgery*; D005260:Female; D005270:Femur Head / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D005271:Femur Head Necrosis / Q000175:diagnosis / Q000601:surgery; D005500:Follow-Up Studies; D006801:Humans; D006811:Humerus / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods; D008297:Male; D008875:Middle Aged; D010020:Osteonecrosis / Q000175:diagnosis* / Q000601:surgery; D011184:Postoperative Period; D011446:Prospective Studies; D011859:Radiography
vernacular_title: MR-Tomographie avaskulärer Knochennekrosen: Primärbefunde und Verlaufsbeobachtungen nach Markraumdekompression.