How food and drink affect your sleep. What you eat and drink before bed can affect your sleep. For example, foods containing the amino acid tryptophanâa building block of the sleep-related chemical serotoninâcould potentially make you drowsy, although evidence is mixed as to whether the amount in food is enough to change your sleep.
The study estimates lifetime societal savings (net present value) of about $12 billion from the more than 600,000 total knee replacement surgeries performed each year in the U.S. These societal savings primarily accrue to patients and employers.
In 2010, almost 700,000 people had knee replacement surgery, and this number is projected to grow each year. There are several reasons why someone might need to have knee replacement surgery. The most common reason is arthritis that damages the cartilage and bones in the joint.