Talk to Orthopedic Surgeon on Knee Cap Dislocation

Four days ago, I slipped, and my left knee dislocated to the side. This had happened before, but my knee would usually go back into place on its own. However, this time it didn’t return to its position and stayed completely out of place. Then my father manually set it back, and we went to the hospital. The doctor examined it, and the X-ray showed that the bone was in the correct position. The doctor advised me to wear a leg immobilizer for 10–12 days. It’s been 4 days now, and I’m still wearing it, but I’m not satisfied what if, after removing the immobilizer, my knee slips out of place again after some time?