Table 2

Signal intensity, echo duration and interval between signals at each site for each grade of cartilage from 20 knees


Grade 0
Grade 1
Grade 2
Grade 3

Signal intensity (relative value, arbitrary units)
     Site A
1.51 ± 0.863
1.33 ± 0.775
1.05 ± 0.807
--
     Site B
2.60 ± 1.945
0.96 ± 0.433
0.73 ± 0.502
--
     Site C
--
--
0.82
0.57 ± 0.456
     Site D
1.30
0.72 ± 0.751
0.52 ± 0.483
0.14
     Site E
1.30 ± 0.788
0.37 ± 0.230
0.46
--
     Site F
--
--
0.84 ± 0.329
0.54 ± 0.402
     Site G
--
1.18 ± 0.218
0.63 ± 0.420
0.40 ± 0.169
Echo duration (μs)
     Site A
1.05 ± 0.136
1.23 ± 0.224
1.34 ± 0.438
--
     Site B
1.08 ± 0.201
1.28 ± 0.279
1.29 ± 0.392
--
     Site C
--
--
1.10
1.11 ± 0.336
     Site D
1.37
1.08 ± 0.301
1.29 ± 0.490
1.17
     Site E
1.12 ± 0.220
1.34 ± 0.376
0.97
--
     Site F
--
--
1.08 ± 0.083
1.04 ± 0.201
     Site G
--
1.25 ± 0.220
1.09 ± 0.235
1.20 ± 0.389
Interval between signals (μs)
     Site A
2.60 ± 0.694
3.07 ± 0.597
3.04 ± 0.672
--
     Site B
2.79 ± 0.441
2.82 ± 0.428
2.72 ± 0.562
--
     Site C
--
--
3.05
1.64 ± 0.504
     Site D
3.90
3.27 ± 0.525
3.34 ± 0.681
2.39
     Site E
2.77 ± 0.794
3.09 ± 0.747
3.68
--
     Site F
--
--
2.71 ± 0.787
1.87 ± 0.647
     Site G
--
1.79 ± 0.398
2.67 ± 0.619
2.49 ± 0.553

Data presented as mean ± standard deviation. For International Cartilage Repair Society grades, see Introduction. For anatomical location of sites, see Figure 1. The number of knees is shown in Additional file 1.

Kuroki et al. Arthritis Research & Therapy 2008 10:R78   doi:10.1186/ar2452