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Table 2 Signal intensity, echo duration and interval between signals at each site for each grade of cartilage from 20 knees

From: Ultrasound properties of articular cartilage in the tibio-femoral joint in knee osteoarthritis: relation to clinical assessment (International Cartilage Repair Society grade)

  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
  1. 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.