Philtral Height Discrepancy in Patients with Complete and Incomplete Cleft Lips + /-Palate - Results from a Single Nation Consecutive Cohort.

INTRODUCTION: The aim of unilateral cleft lip repair is to restore form and function, including symmetrisation of cleft and non-cleft philtral height. Expectation of best outcome is achieved in situations with minimal asymmetry and is assumed occurs most often in incomplete cleft lip only patients. We sought to investigate philtral height discrepancy (PHD) in children with unilateral cleft lip + /-palate from a single nation cohort. METHODS: Review of prospectively collected PHD measurements taken at time of surgery for all children undergoing unilateral cleft lip repair in Scotland born Jan 2017-December 2020. Data was collected using Microsoft Excel and analysed using embedded statistical software. RESULTS: 102 consecutive patients with unilateral lip involvement were identified from the national database. 94 had prospectively documented PHD (92.2%). The majority of patients had an isolated cleft lip (51.1%). Incomplete clefts presented more frequently (52.1%) than complete clefts (47.9%). Mean PHD for the whole cohort was 3.91mm (standard deviation 1.01mm, range 1-6mm). The difference in mean PHD (in-complete versus complete) was 1.1mm (3.4 vs. 4.5, p < 0.001). For lip only versus lip and palate the difference in mean PHD was 1.0mm (3.4 vs. 4.4, p < 0.001). CONCLUSIONS: This single country consecutive cohort review of PHD in children undergoing unilateral cleft lip repair statistically supports the anecdote that patients with an incomplete cleft lip and isolated cleft lip have lesser asymmetry at presentation. This study presents a consecutive cohort with a greater range of PHD than has previously been reported in the literature.