Current information is insufficient to permit a conclusion as to the cause of the event.Review of device history records show the lot released with no recorded anomaly or deviation.There are warnings in the package insert that state that this type of event can occur: under warnings, number 2 states, "prior to seating the liner into the shell component, all surgical debris (tissue fragments, etc.) must be removed from the interior of the shell component, as debris may inhibit the locking mechanism from engaging and securing the liner into the shell component." under possible adverse effects, number 8 states, "dislocation and subluxation due to inadequate fixation, malalignment, malposition, excessive, unusual and/or awkward movement and/or activity, trauma, weight gain, or obesity.Muscle and fibrous tissue laxity can also contribute to these conditions." device requested, not yet received.
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