MRI Study Of The Effect Of Ligaments Around The Ankle Joint

OBJECTIVE Explore the best MRI scanning display level of ankle ligaments in different positions under the condition of optimization of scanning parameters and scanning sequence. Therefore find high resolution and clear scanning images to provide more accurate diagnostic information for clinic.METHODS Selected the optimization of scanning parameters and scanning sequence based on the MR scanning of six males' ankles by five kinds of MR sequences and three kinds of scanning planes respectively. Then scanned 34 ankles of healthy volunteers by MRI-T1 WI according to the above-mentioned positions and methods. Make a statistical analysis by?2test on displayed results of different position but the same orientation scored.RESULTS(1)The imaging resolution was improved by utilization of the small FOV(130mm), thinner thickness(2.0/1.0), larger matrix(410x510) and the flexible surface coil. Different planes and sequences were valuable when they are used to show the normal anatomy or the abnormal features of the ligament and the others. T1W1 and PDW could well display the normal anatomy, T2W1 and T2W-SPAIR could well display the tissue abnormality.(2)ATTL shows best on the the natural position-coronal and the full plantar flexion-coronal images, accounting for 26% and 36% of 3 groups, and there is no difference between them(P>0.05). PTTL shows best in the full dorsal flexion-transverse, accounting for 66% of 3 groups. NTL displays the best on its full plantar flexion-coronal image and full dorsal flexion-transverse section. The difference is significant between the two(P<0.05). CTL shows best in the full dorsal flexion-coronal images, and full dorsal flexion-transverse image, accounting for 35% and 26% of 3 groups. There exists significant difference between the two(P<0.05).(3)ATFL shows highly rate, 39% and 37% of 3 groups, on full dorsal flexion-transverse images and the natural position-transverse images, and the statistical results shows no significant difference between them(P>0.05). And no significant differences(P>0.05) between on full dorsal flexion-coronal displays and natural position-coronal displays. PTFL on natural position-coronal and the full dorsal flexion-transverse images displays best, which accounts for 49% and 34% of 3 groups, there is a significant difference between them(P<0.05). No significant differences between all sagittal images(P>0.05). CFL on the natural position-transverse displays well, which accounts for 47% of 3 groups, and there is no significant differences among all the different sagittal images(P>0.05).(4)Transverse section of anterior tibiofibular ligament and posterior tibiofibular lig in different position displays well. TTF on the dorsal flexion-transverse and the natural position can be scanned well, which accounts for 29% and 37% of 3 groups, and there is a significant difference between the two(P<0.05). Coronal and transverse section of interosseous ligaments in different position displays better.CONCUSION The imaging resolution is improved by utilization of high resolution MRI instrument and the flexible surface coil on the condition of small FOV, thinner thickness and larger matrix. Different planes and sequences are valuable to show the normal anatomy or the abnormal features of the ligament and the others. In different positions and sections of ankle ligament, MRI can clearly show the ankle ligament anatomical structure to improve the accuracy of clinical diagnosis.