First Aid treatment of the knee should follow the P.R.I.C.E regime. Simple pain killers obtained over the counter can help in the initial days after surgery such as paracetamol and ibuprofen.
P – Protect the limb – Splint / Don’t walk on the limb
R – Rest
I – Ice the knee (Cover the skin always with a towel and ice packs or bags of frozen peas are great)
C – Compression – Stretchy bandages to help reduce the swelling
E – Elevate the leg.