Habemus plus vis computatoris quam Deus

the FDA is saying for 80% of the population the expected lifetime is 20 years.

But I forwarded you a lot of links...

http://www.celebrationjointreplacement.com/lifetime.htm
http://www.stronghealth.com/services/totaljoint/joinreplacement.cfm
http://www.stronghealth.com/services/totaljoing/kneereplacement.cfm
eOrthopod (http://www.eorthopod.com/eorthopodV2/index.php/fuseaction/topics.detail/ID/3a680c091a62a9749e0730167371c81b/TopicID/ab58fba8c039f666668d6c4886234710/area/19)
http://www.fda.gov/fdac/features/2004/204_joints.html
http://www.harthosp.org/orthopaedics/TJR/099.htm