Replies to post #22751 on SiNtx Technologies Inc (SINT)

[boston745]

During irradiation, free radicals are formed in UHMWPE through bond cleavage and most of these free radicals are recombined in the form of crosslinks in the amorphous phase.4 However, the free radicals formed in the crystalline phase are long-lived5 and cause embrittlement through cascading oxidation reactions.6,7 Therefore, the postirradiation thermal treatment step has been used to reduce or eliminate these ‘residual’ free radicals.

Remove the oxygen prevent the oxidative embrittlement. The irradation helps prevent the femoral head from molding itself into the liner. These are the two main issues preventing longer hip implant lifespans when PE liners are used.

[SmokerX]

I thought we where arguing simply COC or MOM vs a poly liner, hence why I`m glossing over the dangers of metallosis etc.

I dont think liner wear is simply to due with hardness value

We're dealing with plastic that fails just sitting there due to oxidization. Failure in plastic due to oxidization is completely different then failure due to tribological wear. I can recognize what caused failure. That pic of the liner failure I just posted looks like tribological wear. The dust left in that ford window motor is failure from oxidation. That 8 year hip failure from a dog I posted here has signs of tribological wear but no complete oxidation failure. Lends credence to the ideas i'm posting about mohs hardness.