Athletes often present with a long history of pain and multiple previous operations. This makes determining the exact source of the pain difficult. I often use trigger point injections to try to localize the pain. For example, assume an athlete presents with pain that is near the origin of the adductor longus tendon. If that tendon is injected with lidocaine (a local anesthetic) and the pain gets better, then that would be strong evidence that the adductor longus is the source of the pain. In a similar manner other structures can be injected such as the ilio inguinal nerve, the genital nerve, the spermatic cord, the symphysis pubis, etc With sequential trigger point injection, the etiology of chronic pain can often be identified then the appropriate treatment can be started.