Placement of intra-articular injections verified by ultrasonography and injected air as contrast medium

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Figure 1  .

(A) Ultrasonography of a metatarsophalangeal (MTP) joint before injection. The distended capsule is seen (black arrows). (B) Ultrasonography of MTP joint after injection of sterile air (white arrows) and 2 ml steroid. Only the volume of air that is in the needle itself is injected (~0.05 ml).