Can Taking Oxycodine Be Safe For Chronic Knee Pain?

I'm A Thirteen Year Old Female Who Is Bipolar But Otherwise Healthy. Ever Since I Was Seven I've Been Plagued By Chronic Pain In My Right Leg. It's A Sharp Sort Of Ache. I Can Barely Put Any Pressure On It, And Have Since Been Walking With A Cane. I'm currently being treated with Oxycodine for the pain but I need answers! Caught your attention? Good! I'm desperate. Help please. I