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Table 2 Location of the center and edge of the tibial tunnel footprint

From: Morphological changes in tibial tunnels after anatomic anterior cruciate ligament reconstruction with hamstring tendon graft

  Location (%) Shift (%) (b-a) P (a vs. b)
3 weeks post-op. a 1 year post-op. b
Anterior tunnels
Anterior-posterior direction
 Center 25.8 ± 3.1 26.7 ± 3.0 0.9 ± 1.0 n.s.
 Anterior edge 20.7 ± 2.9 21.4 ± 3.0 0.7 ± 1.5 n.s.
 Posterior edge 31.7 ± 3.3 32.8 ± 3.3 1.1 ± 1.2 n.s.
Medial-lateral direction
 Center 46.7 ± 2.9 47.4 ± 3.2 0.6 ± 1.2 n.s.
 Medial edge 40.0 ± 3.5 40.5 ± 3.8 0.5 ± 0.9 n.s.
 Lateral edge 54.0 ± 2.3 55.0 ± 2.4 0.9 ± 1.2 n.s.
Posterior tunnel
Anterior-posterior direction
 Center 39.6 ± 4.5 42.1 ± 4.3 2.5 ± 1.3 < 0.001 c
 Anterior edge 35.6 ± 4.5 37.0 ± 4.2 1.4 ± 0.9 < 0.001 c
 Posterior edge 44.1 ± 5.2 47.4 ± 6.6 3.6 ± 1.6 < 0.001 c
Medial-lateral direction
 Center 46.0 ± 3.0 47.6 ± 2.8 1.6 ± 1.0 < 0.001 c
 Medial edge 43.0 ± 3.5 44.1 ± 3.3 1.1 ± 1.0 n.s.
 Lateral edge 48.9 ± 3.0 51.1 ± 2.7 2.2 ± 1.2 < 0.001 c
  1. Mean ± standard deviation
  2. Post-op. postoperatively
  3. c statistically significant difference with the Wilcoxon signed-rank test (P < 0.05)