Jaw pain relief: does adding gel to surgery help?

This study looks at two treatments for a jaw joint condition called disc displacement without reduction, which causes pain and trouble opening the mouth. Fifty-two adults who haven't gotten better with standard care will be randomly assigned to get either arthroscopic surgery alone or surgery plus an injection of hyaluronic acid (a lubricating gel). The goal is to see which approach better reduces pain and improves how wide the mouth can open.