This clinical trial is focused on patients undergoing Total Hip Arthroplasty, commonly known as hip replacement surgery. The study is investigating the effects of a treatment involving two medications: Ropivacaine Hydrochloride and Adrenaline. Ropivacaine Hydrochloride is a local anesthetic, which means it helps numb the area to reduce pain, while Adrenaline is often used to prolong the effects of anesthetics and reduce bleeding.

The purpose of the study is to determine if injecting these medications directly into the hip joint before surgery can reduce the need for additional pain medication after the operation. This is compared to a placebo injection, which does not contain active medication. The study will involve patients receiving their hip replacement surgery and will monitor their need for extra pain relief in the hours and days following the procedure.

Participants in the study will receive either the medication or a placebo before their surgery. The study will track how many patients require additional pain medication after the operation, as well as other factors like pain levels, side effects, and overall satisfaction with the pain management. The goal is to see if this approach can improve pain control and recovery for patients undergoing hip replacement surgery.