The cement was long used in dentistry before application in Hip Implants. Hip fracures used to be a leading cause of death because of complications from bed rest. Strokes or Pnumonia for example. Charnley perfected the cemented hip replacement to get people out of bed and wieght bearing as soon as possible to save lives. The cement-less hip replacments delay full and painless wieght bearing. What data addresses the mortality of delayed wieght bearing, or increased short term revisions in cementless implants?

The Charley femoral implant came in one size and one piece. When Dr. Charnley was asked why he did not make more sizes, He said more sizes would multiply the chances of the surgery going wrong. Where is the data to show that newer hip systems are better than the one piece designs?

Glue makes every prosthesis an instant custom fit with infinite interlocking buffered distributed contact points as compared to only three highly stressed direct points of contact of the wedged in cementless prostheses. Persistant theigh pain is a known complication of cemetless prosthesis. Large numbers of sizes of expensive prothesis, supply and obselence issues, product recalls and high costs.

Metal is has a long history of loosening and rejection over time in bone. ( Perhaps a 40% rejection rate) This has been observed in Metal Plates and screws, and resulted in the practice of removing them.

(ed. a one size fits all cemented prothesis, whose manufacture is simple, whose patents are long expired, for which there is sales competition, is not going to provide the profits of new prothesis which requires inventories of many sizes, elaborate matched tools, sophisticated manufacturing procedures and patents which inhibit competition. For the Doctors there is the need to write papers in academia, and in private practice there is the competition to seem more "modern". FXG)


Where do you buy one piece cemented prothesis? Stem and Cup in the US? or anywhere? is it time to start manufacturing the original Charneley Cobra Style again?




Here are some issues of interest on installing cemented hips

Use single