Cortisone (often combined with a numbing medication) is injected into the ankle joint. There is strong evidence showing that performing these under ultrasound guidance is more effective compared to non image guided injections.
Ankle Arthiritis
USG guided Ankle joint intra-articular injection
Musculoskeletal Ultrasound + Regenerative Medicine for the Foot and Ankle - ExEd Institute
The Course of Tarsal Tunnel Syndrome after Ultrasound-Guided Injections
Injection of the ankle joint through an anteromedial approach
Blog and News, Sonoscope
Ankle osteoarthritis (OA) - also known as talo-crural joint (TCJ) osteoarthritis - Ultrasound Guided Injections
Musculoskeletal ultrasound and guided injections Solihull & Birmingham
Ankle injection: what are the options for ankle arthritis?
Ultrasound Guided Injection, Hip & Shoulder Guided Injection Technique - PainTherapyCare
Ultrasound Guided Injection - Portland, OR: Sports Health Northwest, Inc