No anabolic steroid is established as a reliable treatment for healing damaged joints. Reduced pain does not prove that cartilage, tendons, or ligaments have repaired.
Deca, or nandrolone, is often discussed for joint discomfort. A small pilot study in men with low testosterone reported improvements in joint pain, but it did not establish that nandrolone rebuilt cartilage or healed injuries. That evidence is insufficient to recommend it as a joint treatment. PubMed
Doctors sometimes prescribe corticosteroids to reduce inflammation. These are different from bodybuilding steroids, and their role is to manage particular conditions rather than universally repair damaged joints. The NHS explains this distinction. NHS
The right treatment depends on what is causing the pain. Get persistent joint symptoms assessed and adjust painful exercises while you arrange care. Don’t use reduced pain as a reason to push through an injury.