Table 2 Ultrasound findings of the material in 44 patients.

Grey‐scale US
Effusion	35/44 (80%)
Synovial proliferation	39/44 (89%)
Effusion or synovial proliferation or both	42/44 (95%)
Grey‐scale pathology or PDU+ or both	43/44 (98%)
PDU+	34/44 (77%)
PDU+ in histological inflammation	29/35 (83%)
PDU+ in any histological reaction	34/43 (79%)
PDU+ in other pathological synovial reactions than inflammation	5/8 (62.5%)

PDU, power Doppler ultrasound; PDU+, positive power Doppler signal found in the synovium; US, ultrasound.