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Scientific AbstractsFriday, 12 June 2015 645visualized 3D Doppler findings in relation to the tendon sheath were plotted on a schematic drawing ( Fig. 1A and 1B). Results: The overall distribution of feeding vessels was comparable at the level of Lister's tubercle and the level at the pisiforme for the extensor tendons. For the flexor tendons, feeding vessels were more frequent at the level of Lister's tubercle, as shown in Fig. 1A and 1B. Overall feeding vessels were less frequent for compartment V and VI at the level of Lister's tubercle. Feeding vessels were seen less at the superficial location for the extensor tendons, except for compartment I. Radial and dorsal vessels were rare in the tendon sheath of flexor digitorum superficialis and profundus. Intertendineus feeding vessels were mainly seen in the tendon sheath of flexor digitorum superficialis and profundus. Conclusions: Feeding vessels in close relation to the extensor and flexor tendon sheaths were common in the wrist of healthy participants and may be a cause of misinterpretation due to artefacts. These vessels should be taken into consideration when diagnosing tenosynovitis in the wrist. References: [1] Terslev L, Torp-Pedersen S, Qvistgaard E, von der Recke P, Bliddal H. Doppler ultrasound findings in healthy wrists and finger joints. Ann Rheum Dis. 2004 [2] Lillegraven S, Boyesen P, Hammer HB, Ostergaard M, Uhlig T, Sesseng S, et al. Tenosynovitis of the extensor carpi ulnaris tendon predicts erosive progression in early rheumatoid arthritis. Ann Rheum Dis. 2011 [3] Torp-Pedersen ST, Terslev L. Settings and artefacts relevant in colour/power Doppler ultrasound in rheumatology. Ann Rheum Dis. 2008

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