Holistic "TOP TIER" Rhinoplasty: Septal Extensor 2024, Rhinomanometry, Histological Analysis, 3D Evidence, and Rhinoplasty Outcome Evaluation (ROE)

Background: The TOP TIER classification defines seven essential domains for holistic rhinoplasty. The Septal Extensor Rhinoplasty 2024 (SEPTAL 2024) technique uses a costal cartilage graft with dual-functional geometry. This study evaluates if its capabilities warrant a new parameter in the TOP TIER framework. Objective: To determine if the SEPTAL 2024 technique demonstrates a distinct surgical capability that satisfies validation criteria for incorporation as the "Triplanar Single-Unit Control" parameter. Methods: A prospective cohort study of 150 patients undergoing SEPTAL 2024 rhinoplasty (2020-2024). Assessment included rhinomanometry, histomorphometry, 3D stereophotogrammetry, and the Rhinoplasty Outcome Evaluation (ROE) questionnaire. Five validation criteria were prospectively defined: achievability, single-unit achievement, durability, satisfaction correlation, and distinctness. Results: The technique achieved significant simultaneous improvements: tip projection increased by 3.7 mm (p<0.001); nasolabial angle decreased by 12.2° (p<0.001); excessive nasal length decreased by 2.1 mm (p<0.001). All modifications were achieved via a single graft in 100% of cases. Results were durable between 6 and 12 months. Mean ROE score improved from 41.2 to 89.7 (p<0.001), correlating strongly with 3D symmetry (r=0.87). All five validation criteria were met. Conclusions: The SEPTAL 2024 technique demonstrates a distinct capability—triplanar control through a single graft—that satisfies all criteria for addition as a new parameter. We propose formal incorporation as "Triplanar Single-Unit Control," the eighth domain of the TOP TIER holistic rhinoplasty classification system.