John Charnely Cemeted Stem Design
https://hipandkneebook.com/new-blog/2017/3/13/tha-implants-history-of-tha
Charnley Stem
Composite Beam Design
Collar /flange and a rough surface finish
Composite Beam or Shape close design
- relies on friction to maintain position of stem within cement mantle
- rough surface finish ( > 2 Ra ) collar / flange intended to minimized micromotion at prosthesis cement interface.
How does this fail ?
Composite beam designs fail mechanism-
Due to movement at prosthesis cement interface,
Rough surface abrades cement mantle, once micro-movement is established.
Gap formation in turn leads to increased micro movement and circulation of wear debris.
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