Synovial thickness (grey-scale US) | Extent of vascularity (PDUS, CEUS) | Peri- and intratendinous vessel detection (PDUS, CEUS) | Intensity of peri- to extratendinous vascularity (CEUS) | |
---|---|---|---|---|
Grade 0 | <2 mm | No vascularity | No vascularity | No vascularity |
Grade 1 | 2 to 4 mm | Extent <50%a | Solely peritendinous | Peri- <extratendinous |
Grade 2 | >4 mm | Extent ≥50%a | Peri- and intratendinous | Peri ≥ extratendinous |