Now combine that with the idea the smaller the particle the more surface area and apply it to the facts Silicon nitride forms a surface layer of silicon dioxide and the particulate is absorbable unlike Biolox delta. Left to my own devices I wouldnt be revising SiNi hips to Chrome cobalt. I would revise attempts at a 0% fracture rate device with more SiNi and we'd be seeing something completely different than the current datasets in my opinion.
Delta is 75% alumina forte is what 85-100%? If you read the article zirconia still results in surface scratching. 75% or 100% still going to experience third-body wear.
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