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Comparison of MRI and arthroscopic graded knee cartilage damage. Prospective study

The objectivesof this study were: to assess and classify the various types of articular cartilage lesions using MRI and to compare MRI findings with the arthroscopic findings. A prospective study was performed on 45 patients with clinical findings of ACL rupture. MRI of the knee was performed and arthroscopy for reconstruction of the ACL during which the condition of the cartilage was evaluated. In total of 45 examinees 315 articular surfaces were analyzed and lesions were classified during arthroscopy according to the Outbridge, and for MRI using Shahriaree’s modification of Outbridge classification. On MRI a total of 168 articular cartilage lesions were found, and during arthroscopy 125 cartilage damages were observed. Arthroscopic and MRI staging was the same in 117 cases (93.6%). According to the localization of cartilage damage, the biggest matches of arthroscopic and MRI findings were for medial patellar facet (92.3%) and femoral trochlea (91.7%), and lowest were for the medial tibial condyle (75%) and lateral patellar facet (70%). MRI can detect and display cartilage damage that is still not visible arthroscopically. This lesions can be classified in two stages: 1a, which represents lesions in the superficial part extending up to the half of the thickness of cartilage, and 1b, which represents the lesions encompassing the full thickness of cartilage but with intact cartilage surface. Ability to detect cartilage damage prior to the onset of morphological changes will allow us to monitor the development of lesions and follow up the success of treatment.

MRI; articular cartilage

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