The literature article entitled, "failure rates of asian-type anatomic medullary locking stemmed metal-on-metal total hip replacement: a cause for adverse tissue reactions to metal debris (armd)" written by masaru nakamura, tateaki shimakawa, shunji nakano, takashi chikawa, shinji yoshioka, masahiro kashima, shunichi toki, hidehisa horiguchi, and koichi sairyo published by journal of orthopaedic science 21 (2016) 779e785 published only 28 august 2016 was reviewed for mdr reportability.The purpose of the article: "to examine the incident rate of armd, and the implant survival rate as well as to compare the armd group and non-armd group." the article reports on 23 individual cases that received initial depuy product mom thrs between february 2007 and november 2009 of which 14 required revision due to reported pain suspected armd and 9 who did not receive revision but treated conservatively for unexplained hip pain and/or swelling.Each case is captured individually within linked complaints.All cases received aml-a plus stem, ultamet metal insert, ultamet head and pinnacle cup.All patients who received revision had bacterial culture inspections that were negative for infections but all were diagnosed with armd with note of debris including 13 of the 14 with deposition of metal debris at the head-neck junction.This complaint captures revision case 1 of a 72 year old female with a r thr.The mri detected a type iii pseudotumor.She reported pain and limited extension range of motion without note of lower extremity swelling 6 months post initial implantation and noted light brown joint fluid color intraoperatively.Deposition of metal debris at the head-neck junction was noted as unclear.Revision surgery changed bearing surfaces to mop.
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Depuy synthes is submitting this report pursuant to the provisions of 21 cfr, part 803.This report may be based on information which depuy synthes has not been able to investigate or verify prior to the required reporting date.This report does not reflect a conclusion by fda, depuy synthes or its employees that the report constitutes an admission that the device, depuy synthes, or its employees caused or contributed to the potential event described in this report.Product complaint # (b)(4).Investigation summary : no device was received.Root cause undetermined.Depuy synthes considers the investigation closed at this time.Should additional information be received, the information will be reviewed and the investigation may be re-opened as necessary.If information is obtained that was not available for the initial medwatch, a follow-up medwatch, a follow-up medwatch will be filed as appropriate.
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