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Table 5 shows a summary of the average depth of oedema, grade of lesion on MRI and at arthroscopy and the type of MR sequences used (n = 10)

From: The importance of early arthroscopy in athletes with painful cartilage lesions of the ankle: a prospective study of 61 consecutive cases

Outerbridge grade on arthroscopy Average depth of oedema (cm) Grade (on MRI) Sagittal sequence used for measurement
4 1.00 3 T2 Turbo spin-echo
4 2.58 4 Fat saturated Fast spin-echo
4 2.17 4 Fat saturated Fast spin-echo
4 1.50 3 Short time inversion recovery (STIR)
4 1.48 3 T2 SE
3 0.95 2 Fast spin-echo
2 1.47 3 Fat saturated Fast spin-echo
1 1.25 3 Spin-echo
1 1.00 2 T2 Turbo spin-scho
1 1.40 3 Fat saturated Fast spin-echo