Development of a Lateral Longitudinal Arch Evaluation Method for the Foot Using Ultrasonography: Validation With Radiography and Verification of Intrarater and Interrater Reliability.

Introduction: The lateral longitudinal arch (LLA) is an essential structure of the foot. However, LLA evaluation methods remain underexplored compared to those of the medial longitudinal arch (MLA). This study sought to develop a method for measuring the cuboid height, the keystone of the LLA, using ultrasonography and to verify its correlation with radiography, as well as intrarater and interrater reliability.