Clinical History:
M57 with on-going volar aspect pain & swelling over FCR tendon & STT joint 4 months after injury.
Imaging:
Diagnosis:
FCR tendontis, partial-thickness tendon tear and tenosynovitis secondary to SST joint arthrosis
Discussion:
Ultrasound shows:
- FCR ‘tendonitis’ appreciated as fusiform hypoechoic tendon swelling at scaphoid level with associated hyperaemia (yellow arrow);
- Superimposed shallow partial-thickness tear of FCR tendon appreciated as an abrupt focal hypoechoic interruption in fibre continuity with associated tendon contour change at the deep surface (white arrow);
- Predisposing osteoarthrosis at the adjacent STT joint appreciated as a roughened volar articular margin of distal pole scaphoid and accompanying small subchondral cyst (white arrowhead); and
- Associated chronic FCR tenosynovitis appreciated as thickened tenosynovium (yellow arrowheads) and peritendon hyperaemia (Power Doppler).
NOTE: scaph = scaphoid, rad = radius
