Abstract：Objective To explore the feasibility and comparability of MR, CT scan and radiograph in demonstrating the interosseous talocalcaneal ligament (ITCL) and the gap where the ligament lies.Methods The data of 41 cases admitted in the Third Hospital of Hebei Medical University from February 2008 to May 2010 were retrospectively studied. In 41 cases, male/female was 26/15, average age was 43 years(27-70)years, average height was 167 cm(152-185)cm. CT scan and X-ray film were performed on 30 healthy volunteers. In 30 cases, male/female were 15/15, average age was 23(21-24)years old, average height was 170(142-187)cm. MRI and CT scans of the ankle and foot were taken on the objects without trauma or injury in the ankle and foot, respectively. The sagittal and oblique coronal planes of MR and CT images were reconstructed, and the ITCL length was measured in the reconstructed images. Then radiographs of the foot were taken with X-ray beam in various directions. Adjusting the rotation angle, the tube tilted distally was taken as cephalic rotation and the tube tilted proximally was recorded as caudal rotation. Seven radiographs of each foot were taken consecutively at 15, 10, 5 degrees cephalic rotation, neutral position, 5, 10, and 15 degrees caudal rotation. The optimal ITCL gap was observed and measured on each radiograph. The data were compared with those obtained from CT or MR images.Results There was no significant difference between the ITCL lengths either on saggital or oblique coronal CT and MR images between both sides among the same gender. The length for male was longer than that for female on both saggital and oblique coronal CT and MR images. The ITCL length on saggital CT and MR images was shorter than that on oblique coronal CT images. On the saggital MR images, the average length of ITCL was 13.1 mm for males and 12.2 mm for females. On the oblique coronal MR images, the average length of ITCL was 14.7 mm for males and 13.7 mm for females. On the saggital CT images, the average length of ITCL gap was 13.1 mm for males and 12.3 mm for females. On the oblique coronal CT images, the average length of ITCL gap was 14.7 mm for males and 13.8 mm for females. The ITCL gap length of the left side was similar to that of right side obtained from the same X-ray beam rotation. The ITCL gap was demonstrated clearly on the 10 degrees cephalic rotation, with an average length of 13.1 mm for males and 12.4 mm for females.Conclusions The 10 degrees cephalic rotation lateral radiographs of the foot can clearly demonstrate the gap, on which the gap length measured is not significantly different from the length measured on CT and MR sagittal images.
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2015, Vol. 20 
