Early failure associated with the use of Hylamer-M spacers in three primary AMK total knee arthroplasties

We report 3 cases of early failure associated with AMK total knee arthropla sties with the use of Hylamer-M spacers. In 2 of these cases, massive osteo lysis of the posterior condyles was noted; revision with the use of allogra ft bone to fill in the cavitary defects yielded excellent results. In all c ases, large areas of pitting and delamination of the Hylamer spacers were n oted. Given these cases and the previous literature on early failure of hip arthroplasties with Hylamer inserts, we recommend caution in using Hylamer for knee arthroplasty surgery.