Fig. 1
From: Value of musculoskeletal ultrasound in assessment of rheumatoid hand function
MSUS of some of present study patients. a Dorsal longitudinal scan of a metacarpophalangeal joint. Yellow arrow indicates joint cavity enlargement due to hypoechoic synovial fluid as well as hyperechoic synovial thickening with bulging over the tops of the periarticular bones (grade 2 synovial hypertrophy). b Dorsal longitudinal scan of radiocarpal and midcarpal joints. Yellow arrows indicate joint cavity enlargement due to hypoechoic synovial fluid as well as hyperechoic synovial thickening (grade 2 synovial hypertrophy). c Volar transverse view of middle finger at metacarpal bone showing flexor tendon sheath widening (grade 2 tenosynovitis). d Dorsal longitudinal scan of a wrist joint showing interruption of cortical bone (erosion) measuring 2.9 mm (grade 2). Green arrows indicate distention of extensor carpi-ulnaris sheath involving synovial effusion and synovial hypertrophy (hypoechoic and hyperechoic respectively) (grade 1 tenosynovitis). RT, right; LT, left; RCJ, radio-carpal joint; MCJ, mid-carpal joint; MCP, metacarpal joint; MCP, metacarpophalangeal joint; FDP&S, flexor digitorum profundus and superficialis; ECU, extensor carpi-ulnaris; P, pisiform