Fig. 4
Ultrasound images (a short axis section and b long axis section) at the site of flexor tendon injury in the thumb demonstrating the swollen disrupted tendon (white star, a) with an echogenic foreign body inside possibly woody in nature (black arrows, a and b); this was confirmed intra-operatively (c) preoperative photography for the injured thumb showing cutaneous maceration with exposed tendons down to the thumb base