title: Correlation of MR imaging findings and open exploration of medial patellofemoral ligament injuries in acute patellar dislocations.
abstract: The purpose of this investigation was to correlate magnetic resonance (MR) images of medial patellofemoral ligament (MPFL) injuries with gross macroscopic findings. Twenty-seven knees with MPFL injury following an initial patellar dislocation were examined using axial proton-density and T2-weighted fast spin-echo MR imaging. MR findings were subsequently correlated with open exploration. MPFL injury was observed in 26 (96%) of the 27 knees. From the MR images, discontinuity, irregularity and/or high-signal intensity changes anterior to the femoral attachment were seen in 13 (82%) of the 16 knees with substantial-tear type injuries of the MPFL. In 8 (80%) of the 10 knees with avulsion-tear type injuries, detachment of the MPFL from the femoral attachment, accompanied with or without high-signal intensity changes, was confirmed. MPFL injury types could be accurately diagnosed on 21 (81%) out of 26 knees using MR imaging. MR imaging was an acceptable method in diagnosing MPFL injury types.
authors.affiliation: Department of Orthopaedic Surgery, Kawasaki Municipal Hospital, 12-1, Shinkawa-dori, Kawasaki-ku, Kawasaki 210-0013, Japan. ednomura@ea.mbn.or.jp
authors.forename: E
authors.initials: E
authors.lastname: Nomura
authors.forename: Y
authors.initials: Y
authors.lastname: Horiuchi
authors.forename: M
authors.initials: M
authors.lastname: Inoue
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D005260:Female; D005269:Femur / Q000293:injuries* / Q000473:pathology* / Q000601:surgery; D006801:Humans; D004204:Joint Dislocations / Q000473:pathology* / Q000601:surgery*; D007719:Knee Joint / Q000473:pathology* / Q000601:surgery*; D008023:Ligaments, Articular / Q000293:injuries* / Q000473:pathology* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D017888:Medial Collateral Ligament, Knee / Q000293:injuries* / Q000473:pathology* / Q000601:surgery; D017847:Patellar Ligament / Q000293:injuries* / Q000473:pathology* / Q000601:surgery; D012680:Sensitivity and Specificity