Uthaicharatratsame, MD, C. , Pruetiworanan, MD, S. and Suebpongsiri, MD, P. 2022. The Use of Combining a Smartphone and a Digital Angle Ruler Technique to Assist Acetabular Cup Placement: A Clinical Study. Journal of Southeast Asian Orthopaedics. 44, 1-2 (Mar. 2022), 34–41.