Different exercises produce different impacts on the knee joints. The best and safest exercises causing minimum impact on the knee for patients post knee replacement or knee arthritis are walking, biking, riding an exercise bike, and walking on the treadmill. In sports, one can play doubles tennis and not singles.

The maximum stress-producing exercises are jogging and golf swings.

Impact:

• Biking produces the minimum force.It yields an impact of about 1.3 times the body weight.
• Walking on a treadmill produces forces of 2.05 times the body weight.
• Walking on level ground yields forces of 2.6 times the body weight.
• Playing tennis generates forces of 3.1 to 3.8 times the body weight.Serving produces the highest impact.
• Jogging produces forces of 4.3 times body weight.
• Golf swings produce forces of 4.5 times body weight on the forward knee and 3.2 times the body weight on the other.