Preoperative analysis of upper lip in patients with upper cleft lip/palate before lip repair.

Background: The postoperative morphological appearances vary widely patients with unilateral cleft lip with or without cleft palate (UCL/P), whether it is complete or incomplete cleft. The main reason of bilateral lip asymmetry after cleft lip surgery lies in the lack of personalized measurement and design before surgery. In this study, we aim to individually investigate areas of the upper lip on cleft and non-cleft sides in patients with unilateral cleft lip with or without cleft palate (UCL/P).

Methods: Ninety-two patients with UCL/P (group 1: <1 year, group 2: 1-2 years) were included in the study. Group 1 included 37 patients with incomplete UCL/P and 29 with complete UCL/P; group 2 included 11 and 15 patients, respectively. The total area of the upper lip on the cleft side (Q8) was divided into Q3, Q4, and Q5 (further divided into a1 and a2), and the upper lip on the non-cleft side (Q7) was divided into Q2 and Q1 (further divided into A1 and A2). Area ratios between the cleft and the non-cleft sides were calculated, and certain parameters were tested for correlations with these ratios.

Results: Values of Q8/Q7 were partially overlapped between patients with complete and incomplete UCL/P. Significant correlations were noted between differences in height of the philtrum column (a-h) and the prolabial area ratio between the cleft and the non-cleft side (Q3/Q2) (P=0.032). Moreover, a significant correlation was noted between a1/A1 and the ratio of the lateral labial area between the cleft and the non-cleft side (Q5/Q1) (P=0.001).

Conclusions: The conventional classification of unilateral cleft lip as incomplete and complete does not completely and accurately reflect individual malformations. Therefore, it is necessary to analyze unilateral cleft lips individually to determine the repair technique and to predict postoperative outcomes.