Common risk factors in Knee Replacement procedure include infections, blood clotting, complications arising due to anesthesia or transfusion, allergy to metal components etc. On a national average, fewer than two per cent of patients experience knee joint infection or other major difficulties.
Blood clotting in leg veins is one of the most common complications but it can be effectively prevented with medications and low impact exercises. Always consult your orthopedic surgeon about the same.