Final answer:
Steroid injections for shoulder conditions are administered based on the specific ailment: rotator cuff tendinitis, severe shoulder OA, or AC arthritis, and are performed by orthopedic or sports medicine professionals.
Step-by-step explanation:
The appropriate anatomic location for a steroid injection depends on the condition being treated. Rotator cuff tendinitis, which involves inflammation and irritation of the tendons in the shoulder joint, may benefit from a steroid injection into the subacromial space to reduce inflammation and provide pain relief. For severe osteoarthritis (OA) of the shoulder, an intra-articular steroid injection could be considered to relieve pain by reducing inflammation within the joint.
In the case of acromioclavicular (AC) joint arthritis, a steroid injection may be administered into the AC joint. Orthopedic specialists or sports medicine professionals typically perform these injections to maximize the benefits and minimize potential complications.