title: MR evaluation of human anterior cruciate ligament autograft on oblique axial imaging.
abstract: OBJECTIVE
  The purpose was to observe the changing MR appearance of stable anterior cruciate ligament (ACL) grafts on oblique axial images.
  
  
  METHODS
  Fifty-five knees in 44 patients were studied with MRI 1-54 months after arthroscopic ACL reconstruction with double-looped autogenous semitendinosus and gracilis tendons. Knees with poor stability were excluded from this study. Examinations were performed at 0.2 T with SE proton density and T2-weighted sagittal and oblique axial images.
  
  
  RESULTS
  High signal intensity areas covered the grafts 1-3 months after surgery. The high signal subsequently extended into the intertendinous bundles. The entire graft gradually became a low signal intensity bundle again after 12 months. Grafts were classified by their appearance on the oblique axial images.
  
  
  CONCLUSIONS
  We conclude that high signal intensity can be seen within stable ACL grafts.
authors.affiliation: Department of Orthopedic Surgery, Hiroshima University School of Medicine, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Murakami
authors.forename: Y
authors.initials: Y
authors.lastname: Sumen
authors.forename: M
authors.initials: M
authors.lastname: Ochi
authors.forename: E
authors.initials: E
authors.lastname: Fujimoto
authors.forename: N
authors.initials: N
authors.lastname: Adachi
authors.forename: Y
authors.initials: Y
authors.lastname: Ikuta
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D016118:Anterior Cruciate Ligament / Q000473:pathology* / Q000601:surgery; D000070598:Anterior Cruciate Ligament Injuries; D001182:Arthroscopy; D005500:Follow-Up Studies; D006801:Humans; D007718:Knee Injuries / Q000175:diagnosis / Q000601:surgery; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods / Q000706:statistics & numerical data; D008592:Menisci, Tibial / Q000601:surgery; D008875:Middle Aged; D013710:Tendons / Q000637:transplantation; D000070600:Tibial Meniscus Injuries; D013997:Time Factors; D014182:Transplantation, Autologous