US-guided intra-articular knee injection on a short axis. (a) Probe and patient position to perform short-axis US-guided intra-articular knee injection. (b) Anatomical scheme and (c) US scan of short-axis intra-articular knee injection. P patella, F femur, arrowheads lateral joint capsule, asterisk suprapatellar joint recess, arrows needle, VL vastus lateralis. (d) US scan showing steroid (circles) intra-articular injection