Hi, the artificial knee allows a person to do ordinary daily activities with less pain. It does not restore the same level of function that the person had before the damage to the knee joint began. The knee will not bend as far as it did before you developed knee problems, but the surgery will allow you to stand and walk for longer periods without pain. After surgery, you may be allowed to resume activities such as golfing, riding a bike, swimming, walking for exercise, dancing etc. Keeping in view the restriction on bending the knees, you may not extremely bend the knee but may learn to discover a new position on the top but with less bending of affected knee. That will help.
High flex knee replacements will allow extra bending for any activity that involves kneeling and squatting.
I have a friend that has has TKR and she loves being able to be on top again. I have nerve damage after my 12/31/09 replacement it is so bad I am unable stand the pain of this position. So I guess it just depends on how well your knee works. Research and try to get a knee that does more than Depuy knee.