الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
MRI T2 mapping of the cartilage is a non-invasive functional imaging technique delivering cartography of the T2 relaxation time of the cartilage without any contrast injection. It is sensitive to tissue anisotropy, and provides compositional information on the cartilage collagen network, water content and proteoglycans concentration. This study included 30 cases, 20 patients clinically presented with ankle pain (13 females & 7 males) & suspicious to have articular cartilage lesion and 10 volunteers’ (5 males & 5 females) as a control group. Their ages ranged from 20-60 years with a mean age of 40 years. The aim of this work is to evaluate the role of advanced MRI using T2 mapping sequence in assessment of osteochondral lesions of the ankle joint. All patients were subjected to full history taking, clinical examination, routine MRI examination & T2 mapping sequence. All MRI studies were obtained using MRI machine (GE) 1.5 Tesla system Scanner using special software. Firstly, the standard imaging planes of the ankle joint were evaluated with focusing on its articular cartilage at different imaging sequences, and then sagittal T2 maps were generated using a special software technique. Thereafter, these standard planes were evaluated together with sagittal T2 maps for the same regions of interest and articular cartilage was evaluated using color scale from red to blue. Intact articular cartilage was defined by the normal signal intensity in different pulse sequences with uniform thickness, while in T2 maps normal ankle articular cartilage at different sites generally below 60 milliseconds which corresponds to the green to yellow zone on the color scale in our study. Agreement between MRI only VS MRI with T2 mapping sequence had done .there is moderate significant agreement between MRI only VS MRI with T2 mapping sequence.