Contrast Fomentation (Hot and Cold). Contrast bath---It is a form of treatment knee is applied warm water followed by the immediate application of the knee with ice water. This procedure is repeated several times, alternating hot and cold. Note that the treatment should always end in the ice water, as heat will induce the body's inflammatory response, while cold helps to decrease inflammation.

Hi... Don't worry about previous surgery it would have healed by now.. Now this could be afresh injury due to slip.. Revert back with full details to help you better... Where is the pain...till what level you can bend freely without pain..is there any kind of restricted feeling...how severe the pain is while attempting to bend... As if now... Keep lot of icing in your knee painful area... Keep it compressed with compression bandage.. Take Anti inflammatory tabs if you have one prescribed to you earlier... Revert back with details...