How a compression sleeve works is it disperses the force equally on the elbow and forearm to help reduce the pain. It also helps improve blood flow and that's why you see athletes wearing sleeves on their calves, elbows, and ankles. However, you need to try different braces to find the one that's right for your condition and goal.
The compression sleeve should be tight enough without restricting movement. This will help drive more blood flow to the area without cutting off circulation.