Knee replacement surgery may help you if other arthritis treatments don't work and you have any of the following: 1. You can't walk very long or very 2. You can't get in or out of a chair 3. Your knee is bowed in or out 4. Moderate to severe pain when you're resting More info - http://simoncoffey.com.au/partial-vs-total-knee-replacement-which-is-better/