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Batch review performed on 20 june 2018; lot 147634: (b)(4) items manufactured and released on 24 march 2015 expiration date: 2020-01-31 no anomalies found related to the problem.To date, (b)(4) items of the same lot have been already sold without any similar reported event.Clinical evaluation performed by medical affairs manager on 28 may 2018.Partial hip revision surgery occurred 2 years and 9 months after primary cementless total hip arthroplasty in a woman previously affected by polio.Radiographic images provided show the presence of radiolucent lines in gruen zones 1 and 7 suggesting proximal mobilization of the stem.Aseptic loosening of the stem is a possible literature described adverse event after cementless total hip arthroplasty and causes are often unknown: patient anatomy, bone morphology and comorbidities may represent risk factors for the long term survivorship of the implant.On the basis of available information, the reason of this failure cannot be determined.Preliminary investigation performed by r and d product manager on 20 june 2018.The images were analyzed; the stem appeared with coating partially absorbed, and some scratches were evident in its surface, especially in the intradox, probably occurred during the revision surgery.From the received images it can not be possible to determine the root cause of the event, but aseptic loosening of the stem is a possible literature described adverse event.
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