Polyaxial screw tulip came apart from the screw body prior to revision surgery.This was a revision case.No reason for revision was provided.Original case done in april of 2017.No surgical technique was provided.No pre or post-op x-rays were provided.No patient anatomy was provided.No harm or injury to patient was reported.Case is indeterminate.Another pedicle screw was used as a replacement.Various potentials causes are [1] carpentry mismatch between desired construct curvature and implnat placement can induce excessive force on the tulip-rod assembly leading to tulip pop off; [2] patient activities or accidents could have led to the tulip popping off.No injury or harm to the patient was reported.
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