Fig. 1From: The use of growth standards and corrective formulae to calculate the height loss caused by idiopathic scoliosisHeight loss formulae plotted as mathematical functions for a single curve pattern. Note: The Hwang formula is depicted as two parallel lines, Hwang 10 and Hwang 70. This allows for a measure of kyphosis as required by the formula. A kyphosis of between 10° and 70° will include all of the data presented in this series which would be found between the two linesBack to article page