Objective
To determine the optimal tibial insertion orientation for guiding the transverse drill lead angle and tibial positioner during reconstruction of a single-bundle anterior cruciate ligament (ACL).
Methods
A total of 48 patients (26 males; 22 females) with normal knee magnetic resonance imaging (MRI) were screened. Ultimately, 46 patients underwent bilateral knee MRI examination.
Results
For right vs the left knees, the tibial ACL insertion area was 120.10±5.40 mm2 and 119.46±6.59 mm2, respectively in males, and 114.76±7.01 mm2 and 113.68±8.30 mm2, respectively, in females. The angle between the long axis of the tibial ALC insertion area and the anteroposterior line of the tibial plateau was 20.47±3.91° and 20.95 ± 4.15°, respectively, in males, and 19.96±4.00° and 20.60±4.54°, respectively, in females. Additionally, the angle formed by the ACL and the tibial plateau in the sagittal plane was 43.82±4.56° and 44.76±3.58° respectively, in males, and 45.20±3.43° and 44.46±2.17°, respectively, in females. The distance between the midpoint of the tibial ACL insertion and the anterior edge of the tibial plateau in the sagittal plane was 21.59±2.32 mm and 21.79±2.02 mm, respectively, in males, and 18.93±1.12 mm and 20.13±1.84 mm, respectively, in females. Similarly, the length of this point from the posterior edge of the tibial plateau was 34.56±3.36 mm and 34.54±3.04 mm, respectively, in males, and 28.85±2.18 mm and 29.03±2.18 mm, respectively, in females. The coronal angle between the ACL and the tibial plateau was 66.37±4.44° and 66.49±4.96°, respectively, in males, and 66.70±4.84° and 66.39±2.79°, respectively, in females, and the length from the midpoint of the tibial ACL insertion in the coronal plane to the inner edge of the tibial plateau was 34.28±1.70 mm and 35.90±1.62 mm, respectively in males, and was 30.21±1.59 mm and 31.84±1.71 mm respectively, in females. The length of this point from the outer edge of the tibial plateau was also 43.82±2.09 mm and 41.70±1.85 mm, respectively, in males, and 37.50±1.72 mm and 35.64±2.29 mm, respectively, in females. Finally, the width of the tibial ACL insertion in the coronal plane was 9.90±1.66 mm and 9.54±1.64 mm, respectively in males, and 8.50±1.03 mm and 8.53±1.18 mm, respectively, in females.
Conclusion
This study determined the optimal drill lead angle for tibia positioning during ACL reconstruction in Chinese patients.