Hi Rob!
I used to work on cardiovascular/orthopaedic unit in a hospital. Have a read.
You should be worried IF :
- your calf is hard to the touch
- your calf is warm/hot
- your calf/lower leg is swollen (mostly the difference is >3cm)
- if your calf is tender to the touch
- you have pitting oedaema
Then you MIGHT have a DVT, which is common after surgery, mostly orthopaedic surgery, because you're most likely immobilized which increases the chance of getting a DVT. A DVT is a Deep Vein Thrombosis or a blood cloth (in your lower leg). Most surgeons give Fractionned Heparine such as Clexane
R or Fraxiparine
R SC (SubCutaeneous) or other types (those were brand names we use over here where I live). Do you have someone in the family with cardiovascular problems? Then you are at higher risk. Also females who are taking the pil (anticonceptives) are also at higher risk.
BEST THING is to get it checked out, because IF you have a DVT you should put your leg up high in the sky (matter of speaking

), stop taking the pill (females) and take anticoagulantia. Walking further on a DVT can cause a PE which is a Pulmonary embolism and I really don't wish that to someone.
Lower leg bruising and warmth are normal after ortho knee surgery. Most times the lower leg and ankle get swollen and get any possible color from black over blue to yellow. My lower leg was swollen big time after my knee surgery and my OS gave me Fraxiparine
R to be on the safe side (well, I had to give it myself

).
So to be on the safe side... get it checked out by a Dr! That way you'll know for sure!!!
Take care
Helena