Google is a powerful reference tool. You can "Google" anything. However, beware of information gathered on the Internet. Always have a skeptical attitude about anything you read on the Internet. In general, "peer reviewed" orthopedic material, such as that published in scientific journals, has stood the test of scrutiny by other orthopedists tasked with ensuring objectivity.
I recommend the following sites:
Click on the following area(s) of interest:
By topic:
Knee replacement- Crouse Hospital
By region:
Sports medicine links: http://www.sportsmed.org/tabs/patienteducation/beta.aspx
Click here: American Academy of Orthopedic Surgeons Patient Info Site
(These sites offer excellent general patient educational information on numerous orthopedic subjects, physician search assistance, and preventative medicine and safety information.)