The prestigious Journal of Arthroplasty reported this month that a study of the OMNILife Apex K2 modular femoral stem was halted "because of a withdrawal of the stems which had an unfavorably high early revision rate.
Scientific analysis of these stems identified a high proportion of potentially concerning subsidence and retroversion with the Apex K2 stem.
Retrieval analysis of Apex K2 stems removed from 3 study patients showed fretting corrosion of the antirotation pin and aseptic lymphocyte-dominated vasculitis-associated lesions. An analysis of 7 additional Apex K2 stems removed from other patients confirmed similar corrosion.
The conclusion of the scientists involved in the study said that their study "shows potentially concerning subsidence of both stems and is the first to describe corrosion at the neck-stem interface and a relationship to metal-related pathology."