Does Corton injection inside is harmful or not? In knee arthritis, many times a person has had knee arthritis for years and is progressing with a series of treatments, and now something happens that, for example, a part of the cartilage is torn off due to wear and tear, and the inside of the knee becomes inflamed. Many times, people who are facing knee arthritis come and report that they have been diagnosed with knee arthritis for two or three years, but they have suddenly experienced an increase in pain during three years. Or in the same way, for example, the meniscus of the patients is damaged or torn, and these people are a group that maybe anti-inflammatory injections such as cortone or ketorolac, which is a non-cortone anti-inflammatory, will help their arthritis pain at this stage and they can return to their previous level of activities. But do these injections cause osteoporosis? In response, it should be said that intra-articular corticosteroid injections are not related to osteoporosis because they do not enter the systemic part and we do not have much reproducibility for them.