During tha surgery, the universal impactor/ positioner could not be removed from trident cup after impaction with hammer.The surgeon tried to remove the positioner but the cup rotated together, so the cup was once removed together with the positioner from the patient.The positioner was removed from the cup by force.Then, the surgeon set the same positioner to the same cup again in the state of slightly loose, the cup was implanted.After completion, the surgeon tried to set the positioner to a window trial, and unusual friction was confirmed.
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