During a laparoscopic appendectomy the patient was tilted less than ten degrees to the left.As surgeon was finishing the procedure, staff heard a loud metal "snap/pop".Staff saw patient began to shift to his left as the physicians began to brace and hold the patient.Staff assisted and braced patient from sliding further.Patient unharmed, sterility maintained and patient placed on new bed.There was discussion about the loud noise heard prior to the patient falling and this noise was able to be recreated with adding some pressure to the sliding pads as it hit the bed frame.After investigation of how the patient could have started to slide off the bed frame from the operating room table, it was concluded most likely the table pad was not secured in the pegs initially, prior to the patient getting on the bed.If the pegs were engaged in the frame we could not recreate a way for the pads to slide off the frame.There are 4 pegs on each of the plates, 2 of which snap into an opening to receive them and 2 which we believe caused the patient to slide.
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