Ultrasound
Both tendons of the 1st extensor compartment of the wrist show continuity. However, the extensor pollicis brevis tendon is thicker than the abductor pollicis longus tendon. The extensor pollicis brevis tendon is compressed between the radius bone and part of the radius intramedullary nail outside the bone. The abductor pollicis longus tendon passes over the radius nail. There is no tenosynovitis. There is a reverberation artifact due to the nail tip.
The transverse plane loop runs from the proximal to the distal direction. An arrow is pointed to the extensor pollicis brevis tendon.
The asymptomatic side was examined for comparison. It shows that the normal abductor pollicis longus tendon is larger than the extensor pollicis brevis in the cross-section.