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.
+ More. Getting a new knee because the original has worn out and may have become painfully arthritic is an increasingly common surgery in America. First-time knee replacement surgeries rose 63 percent between 1997 and 2004, according to a 2008 paper in Arthritis Care & Research.If that clip keeps up, some 1.4 million such surgeries will be performed in 2015, the researchers estimated. More. Getting a new knee because the original has worn out and may have become painfully arthritic is an increasingly common surgery in America. First-time knee replacement surgeries rose 63 percent between 1997 and 2004, according to a 2008 paper in Arthritis Care & Research.