Fig. 23.

Complication related to orthopaedic hardware. Transverse greyscale (a) and colour Doppler (b) sonograms obtained over the dorsal aspect of the proximal phalanx of the third finger in a patient with previous surgical fixation of a displaced fracture of P1. The images show the heads (arrowheads) of two screws extruding from the cortex of the phalanx (PP). Impingement of the screws on the adjacent soft tissues is associated with a hypoechoic area of inflammation (asterisks). In b, note local hyperaemia