(b)(4).Visual examination confirmed low density polyethylene ldpe residue on the edge of the posterior lateral condyle and the posterior aspect of the medial condyle.It was also noted that there is a blue discoloration spot on the posterior aspect of the cam and the posterior aspect of the lateral condyle.The blue discoloration could be removed with a paper towel moistened with water and is likely residue from blue contrast bone cement.The device was used for treatment.This issue has been previously investigated and as part of corrective action, a new supplier for the polyethylene bags has been selected and testing completed to ensure thermal reliability and stability of the new bags.Field action z-0845-2016 was initiated on (b)(6) 2016 to remove remaining affected units from the field.This field action contains the related part and lot number.This mdr was identified during an internal retrospective review to meet reporting requirements and therefore is being filed retrospectively.
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