Free-flap volume correlates with body mass index in patients with tongue squamous cell carcinoma.

[OBJECTIVES] This study aimed to investigate the relationship between postoperative reconstructed tongue flap volume (RTFV) and body mass index (BMI) and identify factors affecting the flap volume in patients with tongue squamous cell carcinoma.

[METHODS] Thirty-two patients were evaluated for RTFV from computed tomography images and BMI. The first and second evaluations were done at 6 months and 1.5 years after surgery respectively. RTFV rate changes and BMI differences from the first and second evaluations were calculated. The correlation between RTFV rate change and BMI difference was assessed using Spearman's rank correlation coefficient. Multiple regression analysis evaluated the relationship between the flap volume rate change and age, sex, flap type, and BMI difference to identify influencing factors.

[RESULTS] The flap volume rate change and BMI difference correlated significantly ( = .594,  < .05). BMI difference and flap type were independent factors that affected reconstructed flap volume rate change in multiple regression analysis ( < .05).

[CONCLUSION] The flap volume of patients with tongue squamous cell carcinoma correlates with the BMI change in the chronic phase. Patients after tongue reconstruction need to be well nourished to maintain BMI and thus postoperative tongue volume to maintain the quality of life.

[LEVEL OF EVIDENCE] Level 3.