Equipment for the Hennepin Technique Intra-articular anesthetic *: 20 mL of 1% lidocaine, 20-mL syringe, 2-inch 20-gauge needle, antiseptic solution (eg, chlorhexidine, povidone iodine), gauze pads Shoulder immobilizer or sling and swathe * Patients are offered analgesia; however, if the patient wishes, one reduction attempt without analgesia may be done.