Lets have a look at an example of the knee turning inwards which leads to pressure excessive pressure on the inside of the knee cap and the muscles on the outside:
The problem with this is that the load is not spread evenly across the knee surface and then transferred straight to the feet. Instead it is spread across the outside and causes abnormaly stresses on a small area of the joint. Initially this leads to stiffness and knee pain. In time, it will cause premature wear or Osteoarthritis.
It can be difficult to spot these things your self and geting a friend to check your alignment whilst on the rollers can be a very useful diagnostic tool.
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