Background: There is still some controversy regarding the method for fixing a soft tissue graft in the femoral tunnel of the ACL (Anterior Cruciate Ligament) reconstruction and the early rehabilitation is limited during the early postoperative period. Method: This study evaluated the coronal and sagittal T2-weighted MR(recovery>120° range of motion) after surgery. The distance was measured from the most upper point of the graft to the upper border of the superior cross-pin. To reduce the intra- and inter-observer bias, the measurements were taken twice by two orthopedic surgeons for all patients. Results: The inter-rater and intra-rater reliability ranged from 0.79 to 0.93. One of the 18 patients showed complete breakage of the 2 cross pins 8 weeks after surgery, even though it was intact 4 days postoperatively. From an analysis of the remaining 17 patients, there was no significant difference in the coronal and sagittal measurements taken at postoperative 4 days and 8 weeks (p=0.170~0.737). Conclusion: The expansion mechanism of cross-pin works well during the early healing period. However, further study on the strength of this fixation technique will be needed because 1 of the 18 patients showed broken pins.