Knocked knees or genu valgum is a condition that both knees turned inward instead of being straight. Usually the person’s feet will also turn inward to what is commonly observed as ‘duck’s feet’. This is quite common in children. As the child grows up, the legs would generally revert to their normal position. However, if it is observed that the child, reaching teenage years still have knocked knees, the common recommendation is to use either corrective surgery or orthotics.
In adults, there is generally no suggested cure for knocked knees. You may think that knocked knees is harmless- it just does not look good when you are walking.
But on a physiological level, knocked knees causes uneven weight distribution on your knees and adults with knocked knees would likely face chronic knee pain which may eventually led to osteoarthritis when approaching middle age. Intensive exercises such as running, mountain climbing, weight training using squats, etc could do more harm than good- causing more pressure placed on the knee. Even constant stretches, if done wrongly may end up causing muscles surrounding the knees to be overstretched and therefore loses its ability to support the shock effectively- causing the knees to have to bear more brunt of the weight.
There is a very good article written by Dr Jolie Bookspan offering advice on how to fix knock knees without using surgery and orthotics. Dr Jolie had developed methods to fix injuries and improve training are used by military and top rehab centers around the world.
She advocates a number of methods that I believe would be very helpful:
There are also other useful articles related to injury and how to relieve conditions such as slipped disk.