Background: Practically the height of the medial longitudinal arch provides acceptable outlook of the arch-height. Aim: Aimed to know inter-relationship of the radiological standing arch-heights with the arch-index for correlation and regression so that from the later we can derive the radiographical standing arch-height values indirectly, avoiding the actual maneuver. Materials and Methods: 90 subjectsstanding x-rays of foot, linear distance of the centre of the heel (say the point K) and the tip of the second toe (axis of the foot) (say the point J) was measuredfor standing navicular, talar heights were measured, and ‘normalised’ with the foot length. Results: The arch-index showed significant negative correlationsand simple linear regressions with standing navicular height, standing talar height as well asstanding normalised navicular and talar heights analysed in both sexes separately. Conclusion: Since arch-index is a time-tested reliable parameter for estimation of arch height so itself can be used regularly for measuring.

Keywords: Arch-Index; Standingnavicular Heights; Standing Talar Heights.