Thanks for writing to us.
The injuries in the knee do sometimes cause a permanent damage. But it is right now too early to choose a knee replacement
specially if he is pain free after the surgery. Taking a second opinion
will be helpful.
I hope this information has been both informative and helpful for you. You can consult me again directly through my profile URL http://bit.ly/Dr-Praveen-Tayal
Dr. Praveen Tayal