Figure 12: (a) Needle inser tion into the center of calcium with in-plane method. (b) Fenestration with backward and forward movement. (c) Fenestration with rotation. (d) Fenestration out-of-plane. (e) Fenestration with two needles. (f) Subacromial bursa injection of steroid. Reprinted with permission from Philip Peng Educational Series