Red, We didn't meet at Carlisle and I'm to blame for that I'm sure. When I had my 3rd surgery on the right knee My "saw bones" installed what most doctors are implanting then and still do today and I've had mine 11 yearz . Oh, and BTW, you try climbing in and out of a big rig 30-40 times a day for 46 years when your first step is 30"s off the ground. For the record knee replacements, are NOT stuck up or down into the hollowed out Tibia or Femur anymore. The Dr. will cut a V notch on the top of the Tibia and glue a stainless steal plate on it! And do a little custom work on the bottom of the Femur and what looks for all the world like a bent stainless steal Horse shoe into a half circle and glue that on too. OH YEAH, AND IF YOU WARE OUT THE NEOPRENE CUSHION THAT THAT HORSE SHOE RIDES ON tHEY CAN MAKE A SMALL INCISION ON THE SIDE OF YOUR KNEE AND SLIDE THAT "WORN OUT BUSHING" OUT OF THE DOVE TAIL THAT HOLDS IT IN PLACE AND SLIDE IN A BRAND NEW ONE! The real win win iz, Their ain't no more pain Buckaroo. Make a copy of this little book and take it to your Doc and let him read it and then you two talk. At 74 I don't run much anymore but I'll bring a gun to a knife fight if I feel the need. ANOTHER WIN WIN, Jer