1 One or both of your parents or several other blood relatives are significantly overweight. If both of your parents have obesity, your likelihood of developing obesity is as high as 80%.  You can't lose weight even when you increase your physical activity and stick to a low-calorie diet for many months.
How long will my knee replacement last is a common question for those with long term knee pain. Replacements used to last 7- 10 years but now knee replacements can last 10-25 years. Listen to your doctor, do your physical therapy and be good to your body. Lifestyle plays an important part in the longevity of the knee replacement. Activity level and body weight will also affect knee health.
How Is An Individual Patient Evaluated for Knee Replacement? Most total knee replacement patients are 60 to 80 years old -- but there are patients who are younger or older that do very well following surgery. Each individual patient must be evaluated to determine if knee replacement surgery is their best option.