Even if you feel fit and healthy, you may be asked to lose weight before knee replacement surgery if you are heavier. Much of the research on complications following knee replacement surgery has been focused on patients with a high body mass index (BMI). In fact, Queen’s Medical Center will not allow the scheduling of any surgery of patients with a BMI greater than 40. This is because patients who are heavier are at higher risk for the following complications:
– Component loosening
– Poor wound healing
– Blood clots
– Pulmonary embolism (blood clot travels to the lung)
Typically, we ask patients to aim for a BMI that is less than 40 prior to surgery. We would prefer patients to obtain a BMI less than 35 as this will significantly lower your risk profile.