Table 4 Magnetic resonance imaging outcomes after the 2-year follow-up period^a

Cartilage status^b, n

 Medial facet of the patella

  Preoperative Gr 0 / 1 / 2 / 3 / 4

0 / 6 / 9 / 4 / 1

0 / 6 / 6 / 5 / 0

n.s.

  Postoperative Gr 0 / 1 / 2 / 3 / 4

0 / 3 / 10 / 5 / 2

0 / 5 / 6 / 6 / 0

n.s.

  p Value

0.02

n.s.

 Lateral facet of the patella

  Preoperative Gr 0 / 1 / 2 / 3 / 4

0 / 10 / 7 / 3 / 0

0 / 12 / 5 / 0 / 0

n.s.

  Postoperative Gr 0 / 1 / 2 / 3 / 4

0 / 9 / 8 / 3 / 0

0 / 11 / 6 / 0 / 0

n.s.

  p Value

n.s.

n.s.

 Medial facet of the trochlea

  Preoperative Gr 0 / 1 / 2 / 3 / 4

0 / 17 / 2 / 1 / 0

0 / 15 / 1 / 1 / 0

n.s.

  Postoperative Gr 0 / 1 / 2 / 3 / 4

0 / 16 / 3 / 1 / 0

0 / 15 / 1 / 1 / 0

n.s.

  p Value

n.s.

NA

 Lateral facet of the trochlea

  Preoperative Gr 0 / 1 / 2 / 3 / 4

0 / 13 / 6 / 1 / 0

0 / 12 / 3 / 2 / 0

n.s.

  Postoperative Gr 0 / 1 / 2 / 3 / 4

0 / 13 / 6 / 1 / 0

0 / 12 / 3 / 2 / 0

n.s.

  p Value

NA

NA

ICRS grade progression, n

 Medial facet of the patella

6

2

n.s.

 Lateral facet of the patella

1

1

n.s.

 Medial facet of the trochlea

1

0

n.s.

 Lateral facet of the trochlea

0

0

NA

Bone contusion, n

 Medial facet of the patella

8

5

n.s.

 Lateral facet of the patella

1

0

n.s.

 Medial facet of the trochlea

4

2

n.s.

 Lateral facet of the trochlea

1

0

n.s.

Cross-sectional area of the femoral tunnel, mm²

 1: Postoperative, 1 day, CT

30.4 ± 1.3

30.6 ± 1.1

n.s.

 2: Postoperative, 2 years, MRI

42.6 ± 6.0

43.7 ± 4.4

n.s.

Femoral tunnel enlargement (%)

 1 vs 2

50.6 ± 21.2

52.7 ± 15.5

n.s.

 p Value

< 0.01

< 0.01

Graft signal intensity, n

 Patellar insertion Low / Intermediate / High

8/11/2001

7/7/2003

n.s.

 Mid-substance Low / Intermediate / High

14 / 6 / 0

10/7/2000

n.s.

 Femur insertion Low / Intermediate / High

13 / 7 / 0

10/6/2001

n.s.