2015 ISAKOS Biennial Congress ePoster #1008

The Reliability and Validity of Magnetic Resonance Imaging in Comparison to Arthroscopy in Knee Injuries

Huseyin Ozkan, MD, Ankara TURKEY
Nuray Can, MD, Kars TURKEY
Eyyup Emre Bahtiyar, MD, Ankara TURKEY
Muhammed Hanifi Gemci, MD, Ankara TURKEY
Engin Yalcin, MD, Ankara TURKEY
Kenan Koca, MD, Ankara, ANKARA TURKEY
Servet Tunay, Prof., Ankara TURKEY

Gulhane Military Medical Academy, ANKARA, TURKEY

FDA Status Cleared

Summary: We aimed to compare knee arthroscopy findings and MRI reports of the patients and to evaluate the reliability and validity of MRI for diagnosing knee injuries. The sensitivity and NPV of MRI was low but PPV was relatively high especially for osteochondral lesions, plicas and lateral menisceal tears. In the light of this, we can consider using MRI as a negative diagnostic tool for knee injuries

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Abstract:

Purpose

Magnetic resonance imaging (MRI) which is a non-invasive and radiation-free imaging modality is frequently using by orthopaedic surgeons for diagnosing knee injuries. The aim of this study was to compare knee arthroscopy findings and MRI reports (daily practice reports from different centers) of the patients and to evaluate the reliability and validity of MRI for diagnosing knee injuries.

Materials And Methods

The retrospective research involved 186 patients (154 male, 32 female) with knee injury who underwent MRI followed by arthroscopic surgery between January 2011 – January 2014. The mean age of the patients was 25.7 (range, 16 to 79). MRI reports of the patients were daily practice reports from different centers. Arthroscopic surgery was performed in same clinic by three experienced orthopaedic surgeons. To compare the results of MRI we used arthroscopy which is the gold standard for diagnosis.

Results

For the identification of anterior cruciate ligament (ACL) injuries the sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of MRI were 95.7%, 57.7%, 65.5%, 94.0% respectively. For medial menisceal tears they were 88.4%, 53.4%, 63.7%, 83.3%. For the evaluation of lateral menisceal tears sensitivity was 46.4%, specificity was 82.1%, PPV was 42.6% and NPV was 84.3%. The sensitivity, specificity, PPV and NPV were 32.1%, 92.5%, 53.1%, 83.6% for osteochondral lesions of the patella; 19.0%, 98.3%, 50.0%, 93.0% for osteochondral lesions of the femoral notch; 31.0%, 89.5%, 53.7%, 76.8% for osteochondral lesions of femoral condyles and 15.2%, 91.7%, 29.2%, 82.9% for suprapatellar plica respectively.

Conclusions

The sensitivity and NPV of MRI was low but PPV was relatively high in our research especially for osteochondral lesions, plicas and lateral menisceal tears. In the light of this, we can consider using MRI as a negative diagnostic tool for knee injuries.