Duraloc head and liner revision performed on 31/08/2016 primary op in 1999, revision required due to poly wear and osteolysis.Head and liner were extracted as per surgical technique and replaced with the following: 58 36+4 10 degree liner, 58 locking ring and head was merete (lima).This case is not being reported by the customer, but jjm employee.All available information has been provided as part of this report; no further information will be forthcoming.Update 09 sept 2016 - the cup & stem remained in situ.Examination of the reported devices was not possible as they were not returned.A search of the complaints databases finds no other reports against the product and lot code combinations since their release to distribution.The investigation can draw no conclusion with the information provided.Based on the inability to determine root cause, the need for corrective action has not been indicated.
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