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“Introduction Adverse consequences of hyperkyphosis (excessive thoracic kyphosis) include physical functional limitations [1–4], injurious falls [5], back pain [6], respiratory compromise [7], restricted spinal motion [8], fractures [9, 10], and mortality [11–13]. However, a recent randomized, controlled trial found that hyperkyphosis was remediable, encouraging further study of its prevention and treatment [14]. Impediments to large-scale hyperkyphosis research are the difficulties inherent in obtaining the criterion standard measurement, the modified Cobb angle [15–19], including expense, limited portability of X-ray equipment, X-ray exposure, and the time necessary to procure and read the radiographic image. To facilitate hyperkyphosis research, investigators have developed inexpensive and X-ray-free kyphosis measures, such as the Debrunner kyphometer and the flexicurve ruler.