Fig. 2From: Incidence and risk factors for redisplacement after closed reduction and instant rigid cast immobilization for paediatric distal radius fractures: a case control studyThe measurement of cast related indices. a, b Cast index. Cast index = b/a. c, d Gap index. Gap index = (c + d)/e + (f + g)/h. e, f Three-point index. Three-point index = (i + j + k)/l + (m + n + o)/pBack to article page