title: Imaging of osseous and cartilaginous intraarticular bodies in the knee: comparison of MR imaging and MR arthrography with CT and CT arthrography in cadavers.
abstract: OBJECTIVE
  To compare magnetic resonance (MR) imaging and MR arthrography with computed tomography (CT) and CT arthrography in the detection of intraarticular bodies in the knee.
  
  
  METHODS
  Cuboid (3- or 6-mm-long sides) osseous and cartilaginous bodies were implanted in 16 cadaveric knee specimens. MR imaging was performed with T1-weighted spin-echo (SE), T2-weighted SE, proton-density-weighted SE, gradient recalled acquisition in the steady state (GRASS), and spoiled GRASS sequences. MR arthrography was performed in two phases with saline and 2 mmol/L gadopentetate dimeglumine. CT and CT arthrography were performed in the transaxial plane.
  
  
  RESULTS
  MR arthrography yielded the highest accuracy for the detection of osseous and cartilaginous bodies combined (92%) and was significantly (P < .01) better than MR imaging (57%-70%), CT arthrography (80%), and CT (74%). Accuracy of CT arthrography was significantly better than that of MR imaging and that of CT. Accuracy of saline-enhanced MR arthrography was significantly inferior (P < .001) to that of gadolinium-enhanced MR arthrography.
  
  
  CONCLUSIONS
  MR arthrography is the best imaging technique for detection of individual intraarticular bodies. CT arthrography is the second most accurate method. Spoiled GRASS and T2-weighted SE sequences are the most accurate at MR imaging. The presence of intraarticular fluid and performance of saline-enhanced MR arthrography improve detectability of intraarticular bodies.
authors.affiliation: Department of Radiology, Veterans Administration Medical Center, San Diego, CA 92161, USA.
authors.forename: J
authors.initials: J
authors.lastname: Brossmann
authors.forename: K W
authors.initials: KW
authors.lastname: Preidler
authors.forename: B
authors.initials: B
authors.lastname: Daenen
authors.forename: R A
authors.initials: RA
authors.lastname: Pedowitz
authors.forename: R
authors.initials: R
authors.lastname: Andresen
authors.forename: P
authors.initials: P
authors.lastname: Clopton
authors.forename: D
authors.initials: D
authors.lastname: Trudell
authors.forename: M
authors.initials: M
authors.lastname: Pathria
authors.forename: D
authors.initials: D
authors.lastname: Resnick
mesh_terms: D001175:Arthrography; D002102:Cadaver; D003287:Contrast Media; D004338:Drug Combinations; D019786:Gadolinium DTPA; D006801:Humans; D007594:Joint Loose Bodies / Q000175:diagnosis* / Q000000981:diagnostic imaging; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000473:pathology; D008279:Magnetic Resonance Imaging / Q000379:methods; D008536:Meglumine; D009942:Organometallic Compounds; D004369:Pentetic Acid / Q000031:analogs & derivatives; D012680:Sensitivity and Specificity; D012965:Sodium Chloride; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media; D004338:Drug Combinations; D009942:Organometallic Compounds; D012965:Sodium Chloride; D008536:Meglumine; D004369:Pentetic Acid; D019786:Gadolinium DTPA