Zilretta is an extended-release steroid injection given directly into a joint. Its active ingredient is triamcinolone acetonide, which is a corticosteroid. It is meant to reduce inflammation within the joint.
What makes Zilretta different from a regular steroid shot is how it releases the medicine. The steroid is encapsulated within very small, biodegradable particles called microspheres. These tiny particles slowly release the medicine over time, rather than dumping it all into the joint at once.
The main idea behind Zilretta is simple: reduce joint inflammation more gradually. It does not rebuild cartilage or repair the joint itself. Instead, it reduces inflammation within the joint environment, making the area less inflamed.
A Zilretta injection is usually considered for knee pain relief. It’s made specifically for the knee joint, not as a general steroid shot for every joint in the body.
Simply put, it may be discussed when knee pain persists even after basic care. That can include exercise, changes in activity, weight management, and over-the-counter pain medicine. If knee pain persists during walking, stair climbing, or normal daily activities, making your life harder, Zilretta may be the next option to consider.
After a Zilretta injection, most people go home the same day and then watch how the knee responds over the next few days and weeks. Some people notice improvement sooner, while others need more time.
In general, it helps to keep the knee moving with normal activity unless your doctor tells you otherwise. Staying active can help with knee function. You should also let your doctor know if you notice a strong reaction at the Zilretta knee injection site, more swelling, fever, worsening pain with swelling, or trouble moving the knee.
You should not get Zilretta in Chicago, IL, if you have an allergy to corticosteroids, triamcinolone acetonide, or any other ingredient in the medication. That is the main reason it should not be used.
It’s also important to remember that Zilretta is a knee joint injection for osteoarthritis pain, so it is not a general steroid shot for any other area of the body. Before treatment, we would review your allergies, medications, and medical history to make sure this option is the right choice for you.
At Painless Medical Practice in Chicago, IL, we first ensure that Zilretta injections are the right choice for your knee. Our clinic is led by Jaroslav Tymouch, MD, the Founder of Painless Medical Practice, so your care is guided by an experienced physician who considers the full picture.
We keep care simple and personal. That means we provide clear answers, a treatment plan that fits your needs, and no extra visits if they are not necessary. If you need trusted pain management in Chicago, IL, we’re here to help you understand your options, including a Synvisc One injection when appropriate.
Schedule an appointment with our Chicago team to discuss the next steps for your knee pain.









Zilretta is an extended-release steroid injection given directly into the knee joint. It is designed to reduce inflammation and relieve pain associated with osteoarthritis.
Relief may begin within a few days, but for some people it can take longer. Results vary depending on how the knee responds to the treatment.
Yes, Zilretta is a corticosteroid injection that contains triamcinolone acetonide, used to reduce inflammation in the joint.
Zilretta injection is used to relieve knee pain caused by osteoarthritis, especially when other treatments like exercise, medications, or activity changes have not provided enough relief.
Zilretta injection may be a good option for people with knee osteoarthritis who still have pain after basic treatments and find that it interferes with daily activities.
