Athletic sustained an injury around the knee joint suspecting cartilage damage, which of the following is an investigation of choice -

MRI is the investigation of choice for ligamentous and mensical injury of the knee. Arthroscopy has the advantage that, if a lesion is identified, it can be treated at the same time. The usual protocol for sports injury in a suspected case is to diagnose the injury by MRI and plan the management accordingly. After that diagnostic arthroscopy is done just before the arthroscopic surgery and all the pathologies are dealt with.