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The reported event could not be confirmed since the devices were not returned for evaluation and no other evidences were provided.A device inspection was not possible since the affected devices were not returned and no other evidences were provided for investigation.Since this event is a particular issue, the opinion of the medical expert was requested with the limited information available and stated as following: ¿unfortunately, without access to any imaging it is not possible to assess this case¿; ¿since the nickel allergy is confirmed by the surgeon, it can be considered regarding this case.If the nickel allergy was known before the index-surgery, then the surgery was done despite the patient having a contraindication (known allergy to one of the materials).If the nickel allergy was not known before the surgery, then this metal allergy was not a known contraindication at the time of the index surgery.Sometimes long-term exposure may sensitize a patient to a material.It is common for debris particles/metal ions of one component reaching the opposing component as well since they do so via the articular space.It is remarkable however, that the glenoid side was unaffected by this".A review of the device history was not possible because the lot number was not communicated.No corrective actions are required at this time.Indications of material, manufacturing, or design related problems were unable to be identified as the lot number was not communicated.A review of the labeling did not indicate any abnormalities."the humeral stem is manufactured from titanium alloy (tialv)", without nickel and "the glenoid sphere is made of chromium cobalt alloy (cocr)", with nickel.In this case, the root cause of the event is most probably due to patient conditions.But, more detailed information (as patient conditions, x-rays/images, clinical reports, batch numbers of the implants.) about the complaint event must be available in order to determine the exact root cause of the complaint event.If any additional information is provided, the investigation will be reassessed.
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