Optimal Condition to Create Femoral Tunnel Considering Combined Influence of Knee Flexion and Transverse Drill Angle in Anatomical Single-Bundle ACL Reconstruction Using Medial Portal Technique: 3D Simulation Study

Table 1

Comparison of mean femoral tunnel lengths in each condition according to the flexion angle and transverse drill angle.

Flexion angle	Transverse drill angle
	MTA	MTA-10°	MTA-20°	P-
100° (mm)	23.5±3.0 (16.128.0)	19.9±4.1 (12.028.1)	15.2±3.7 (8.621.9)	<.001
110° (mm)	29.0±3.2 (22.739.4)	31.5±5.2 (16.345.1)	38.2±9.8 (11.451.6)	<.001
120° (mm)	32.3±3.0 (27.042.7)	36.2±3.9 (28.746.5)	46.1±9.1 (32.478.0)	<.001
130° (mm)	33.6±2.6 (28.241.5)	37.0±3.2 (29.647.2)	44.4±5.4 (34.059.6)	<.001
P-	<.001	<.001	<.001

MTA: maximum transverse drill angle without coming into contact with the medial condyle cartilage.
The lengths of tunnels (mm) are given as mean ± standard deviation (range).
-value for comparison of tunnel lengths between different transverse drill angles of MTA to MTA-20° in condition of fixed flexion angle.
-value for comparison of tunnel lengths between different flexion angles of 100° to 130° in condition of fixed transverse drill angle.