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The most common complication of thyroid surgery is hypoparathyroidism, usually temporary. Ischemic injury or parathyroid avulsion are the causes of surgical hypoparathyroidism. We assessed the value of an ultrasound scalpel, the Harmonic Focus® (HF), could prevent surgical-related hypoparathyroidism.Patients consecutively undergoing total thyroidectomy using the HF from November 2009 to February 2011...