Ultrasound guided steroid injection of the wrist joint. a. The wrist joint (*) is seen placing the transducer in the longitudinal axis of the radius, in between the distal epiphysis of the radius (E) and the proximal carpal bones (C). It is important to differentiate the joint space (*) from the distal growth plate of the radius (G). b. Simulated wrist joint injection in a mannequin showing the advancement of the needle using an “out-of-plane” approach. c. The needle (arrow) is advanced into the joint space, keeping the distal radial epiphysis (E) as a reference.