title: Diagnostic accuracy of Magnetic Resonance Imaging in assessment of Meniscal and ACL tear: Correlation with arthroscopy.
abstract: OBJECTIVE
  To determine the diagnostic accuracy of magnetic resonance imaging (MRI) in injuries related to anterior cruciate ligament and menisci and compare its effectiveness with that of arthroscopy.
  
  
  METHODS
  This retrospective cross-sectional study was conducted in the department of Radiology & Medical Imaging of Dallah Hospital, Riyadh, Kingdom of Saudi Arabia from September 2012 to March 2014. Fifty four patients (including 30 men and 24 women) with internal derangement of knee referred from the orthopedic consulting clinics underwent MR imaging followed by arthroscopic evaluation. The presence of meniscal and ligamentous abnormality on the imaging was documented by two trained radiologist. Findings were later compared with arthroscopic findings.
  
  
  RESULTS
  The sensitivity, specificity and accuracy of MR imaging for menisci and ACL injury were calculated: 100% sensitivity, 88.4% specificity, 90% positive predictive value, 100% negative predictive value, and 94.4% accuracy were noted for medial meniscal injury. Similarly, MR had sensitivity of 85.7%, specificity of 95%, positive predictive value of 85.7%, negative predictive value of 95%, and accuracy of 92.5% for lateral meniscal injuries. Likewise, anterior cruciate ligament had 91.6% sensitivity, 95.2% specificity, 84.6% positive predictive value, 97.5% negative predictive value, and 94.4% accuracy.
  
  
  CONCLUSIONS
  MRI is extremely helpful in identifying meniscal and anterior cruciate ligaments tears. MR imaging has high negative predictive value making it better choice as screening tool compared to diagnostic arthroscopic evaluation in most patients with soft tissue trauma to knee.
authors.affiliation: Dr. Jamal Yaqoob, MBBS, MCPS, FCPS, FRCR. Consultant Radiologist, Department of Radiology, Dallah Hospital, Riyadh, Kingdom of Saudi Arabia.
authors.forename: Jamal
authors.initials: J
authors.lastname: Yaqoob
authors.affiliation: Dr. Muhammad Shahbaz Alam, MBBS, FCPS. Specialist Radiologist, Department of Radiology, Dallah Hospital, Riyadh, Kingdom of Saudi Arabia.
authors.forename: Muhammad Shahbaz
authors.initials: MS
authors.lastname: Alam
authors.affiliation: Dr. Nadeem Khalid, MBBS, MSc, FRCS. Consultant Orthopedic Surgeon, Department of Orthopedics, Dallah Hospital, Riyadh, Kingdom of Saudi Arabia.
authors.forename: Nadeem
authors.initials: N
authors.lastname: Khalid
keywords: Anterior Cruciate Ligament (ACL); Lateral Meniscus; Magnetic Resonance Imaging (MRI); Medial Meniscus; Posterior Cruciate Ligament (PCL)