Bone erosion | An intra-articular break of the bone profile that is detectable in at least two perpendicular planes |
Joint effusion | A compressible anechoic intra-articular area |
Synovial hypertrophy | An uncompressible hypoechoic intra-articular area |
Power-Doppler signal | Intra-articular coloured spots |
Soft tophus-like lesion | A deposit showing an inhomogeneously echoic “echotexture” |
Hard tophus-like lesion | A deposit appearing as a hyperechoic band generating a posterior acoustic shadow |
Mixed tophus-like lesion | A deposit showing ultrasound features of both soft and hard tophus |
Double contour | A focal or diffuse enhancement of the superficial margin of the articular cartilage whose reflectivity is independent of the angle of insonation |
Hyperechoic spots | Spots <1 mm in size with the same echogenicity of the bony cortex |