Australian physicians and orthopaedic surgeons have perfected many knee braces for football sports injuries. Dr Merv Cross, regarded as the finest knee surgeon in Australia source: http://www.bestkneesurgeon.com.au presents their effectiveness following practitioner knee operation.
The non hinge sort of knee braces are pretty much what I call "mind braces". They just actually help your knee in your brain. There are exceptions such as, if you've got a knee cap issue the non hinged braces works and the pressure of the non hinge braces can help the athlete discontinue thinking about the pain and it's also awesome.
The springy sort of knee braces will not assist you to prevent 99% of knee injuries or damage.