Severe Knee Pain after Dogs Ran Into It.

Patient: About 2 months ago my dogs ran straight into my knee all I heard was a loud pop before my knee gave out, there was severe pain and I couldn’t feel my leg from the knee down for about 3-4 minutes. It hurt to walk that night and the following day for a few weeks. I can no longer kneel or put pressure on that knee cap and after standing for long periods of time my whole leg starts to hurt and when I go to bend my knee there is a sometimes severe pain in the joint area. What have I done? I have worn non supportive braces and am now trying to wear a hinge supporting brace. What have I done, and what can I do to help it heal faster?