My MRI indicated a small meniscus tear on medial meniscus (inside) and a bone contusion on the posterior lateral tibuial plateau (outside). Doc wants to go in for the tear, but says there is nothing to do with the contusion. It isn't the tear that hurts or seems to lock up. When my knee locks up or gives out, it feels like the outer knee letting go. I am not looking forward to surgery if it's not even going to address the part that hurts. How can I be sure it's worth going in?