Running

• Running places a lot of repetitive impact on the knees, and should not be done.
  
  

Jumping

• Sports or activities that involve jumping should not be done either. These also place a lot of impact on the knees.
  
  

Twisting

• The knee cannot be twisted, as this places too much lateral pressure on the joints. Sports with side-to-side motions, like racquetball, tennis and skiing, should not be done.
  
  

Kicking

• Repetitive kicking motions, such as in kickboxing, can also be problematic to the knee.
  
  

Weight

• Anything that places a lot of weight on the knee should also be avoided. Some examples would be heavy squats, moving heavy objects or kneeling on hard surfaces.
  
  

Prevention/Solution

• Activities that are allowed do not put any stress or tension on the knees. Some examples of these would be cross country skiing, bike riding and swimming.