In addition: age of patient; state of general health and mobility; current level of weight bearing allowed by surgeon? ; ammount of pain present?; temperature of knie around the site of OP? Ability of patient to be compliant and actually carry out your instructions without supervision. If cooling helps I'd advise against aggressive too icey cooling. We use "quark" poultices here in Switzerland which translates as "formaggio tipo ricotta" and the patients do it at home themselves when needed. Just take it out the fridge (not freezer) plaster the quark on and let it cool the knee.
I had one lady who somehow thought 6 weeks was enough to get back to normal and she tried going up and down stairs again and again between my treatments to make things get stronger..a disaster and I don't know where she got the idea from. Another did hardly anything and was massively overweight and unfit but her knee was brilliant....so think a bit laterally as you continue. Good luck