EP1.64 Three-Zone Planning (3Z) for Spherical Periacetabular Osteotomy: A Structured Framework for Quantitative Acetabular Reorientation
Abstract Background Spherical periacetabular osteotomy (SPO) preserves pelvic ring continuity while enabling three-dimensional acetabular reorientation in developmental dysplasia of the hip (DDH). However, the osteotomy trajectory and fragment motion have traditionally been defined qualitatively, limiting reproducibili...