Figure 4
From: Sonographic swelling of pronator quadratus muscle in patients with occult bone injury
Sonographic transverse image of the examined part of the distal forearm, including anatomical reference and measurements of PQ thickness, using a 17-MHz transducer. Left hand of the same volunteer with Figure 2. We referred to the line tangential to the convex aspect of the ulna, which was drawn from the ulnar rim of the radius. PQ: pronator quadratus; R: radius; U: ulna; full-lined arrow: maximum thickness of PQ.