Well it's certainly relevant it appears nothing was ever published regarding that infinia implantation and for 7 years an update was never released regarding anything to do with infinia.
"protein precipitation"
Synovial fluid protein levels greater than 2.5 g/dl are abnormal, and those greater than 4.5 g/dl indicate significant inflammation.
I'll go out on a limb here and say knee surgery would lead to inflammation and the synovial fluid would be the source of these proteins that supposedly crashed out of solution.
I wonder if the body was mistaking the Silicon Nitride for bone and attempting to repair the collagen layer, if this is true. Versus a foreign body response.
Collagen may be attached to cell membranes via several types of protein, including fibronectin, laminin, fibulin and integrin.