hi,i appreciate your concern about ur knees.it seems your knees are having degenerative arthritis (OA) when the space between patella and femur bone is reduced,it gives pain on bending,this movement is needed for getting up,sitting down andalso sitting on ground.you are also sugested to do blood ch eckup to ruleout crystal arthropathy and other arthritis conditions which can cause more pains and swellings.i usually give safe painkillers cource to patients along with warmor ice therapy,knee orthrosis to give knee rest.non surgical treatments are available now with promising results.thanks.i will be happy to answer future quary.