“…Eighteen studies calculated the angles between the spine segments de ned (24,27,71,72,75,76,78,80,89,94,95,97,40,(51)(52)(53)(54)60,63,68) while 33 studies (12,13,47,48,50,(55)(56)(57)(58)(59)62,64,14,(65)(66)(67)69,73,74,81,83,87,88,31,90,91,93,96,38,39,41,…”