Identification and glenohumeral hydrodilatation on frozen shoulder. A posterior approach for glenohumeral joint injection created an anatomical landmark approximately 1–2 cm below the posterolateral acromion and shifted to the medial, short-axis probe position (A). Echogenic needle insertion in-plane position from the lateral to the medial, penetrating the infraspinatus muscle and posterior capsule, injecting the steroid (40 mg triamcinolone acetonide) as 15–20 mL aquabidest (B).