To examine the consistency between postoperative CT scan and intraoperative arthroscopic measurement in evaluating femoral tunnel position for anterior cruciate ligament （ACL）reconstruction，both using the apex of the deep cartilage（ADC）as the marker.
The position of the center of femoral tunnel was decided in the complete femoral stub. Then the length from the ADC to the anterior cartilage margin（L1）and to the center of femoral tunnel（l1），as well as the center to the distal cartilage margin（D1）were measured under arthroscopy and on post-operative CT scan（L2，l2 and D2）. Moreover，P1 and P2 were calculated through l1/L1 and l2/L2.
Study Type
OBSERVATIONAL
Enrollment
52
Ma Yong
Beijing, Beijing Municipality, China
RECRUITINGlength from ADC to anterior cartilage margin (L1) under arthroscopy
length from ADC to anterior cartilage margin (L1) under arthroscopy
Time frame: during operation
length from ADC to the center of femoral tunnel (l1) under arthroscopy
length from ADC to the center of femoral tunnel (l1) under arthroscopy
Time frame: during operation
length from the center of femoral tunnel to the distal cartilage margin(D1) under arthroscopy
length from the center of femoral tunnel to the distal cartilage margin(D1) under arthroscopy
Time frame: during operation
length from ADC to anterior cartilage margin (L2) on CT
length from ADC to anterior cartilage margin (L2) on CT
Time frame: 1 day after operation
length from ADC to the center of femoral tunnel (l1) on CT
length from ADC to the center of femoral tunnel (l1) on CT
Time frame: 1 day after operation
length from the center of femoral tunnel to the distal cartilage margin(D1) on CT
length from the center of femoral tunnel to the distal cartilage margin(D1) on CT
Time frame: 1 day after operation
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