Sensory recovery and oral health-related quality of life following tongue reconstruction using non-innervated radial forearm free flaps

Objectives: This study aimed to monitor the recovery of somatosensory function and oral health-related quality of life after tongue reconstruction using a non-innervated radial forearm free flap (RFFF). Methods: Twenty patients (9 men, age: 42-67 years) underwent tongue reconstruction with non-innervated RFFFs, and twenty age-and sex-matched controls were included in this study. Quantitative sensory testing (QST), including cold, warm, and mechanical detection thresholds (CDT, WDT, MDT); cold, heat, and mechanical pain thresholds (CPT, HPT, MPT); and static two-point, sharp/blunt, and direction discrimination (S2-PD, S/BD, DD) were determined 9 months and 18 months after surgery on the surgical (9 M, 18 M) and contralateral sides (9Mc, 18Mc). Oral Health Impact Profile-49 (OHIP-49) was used to determine the oral-related quality of life of participants. Results: All parameters showed significantly lower sensitivity at 9 M and 18 M (p < 0.001) compared to those for the controls and the contralateral side, except for DD (p = 0.101). In addition, the parameters showed a significant decrease in sensitivity for 9Mc and 18Mc (p <= 0.043) compared to those for the controls, except for MPT, HPT, S/SD, and DD (p >= 0.453). Findings on WDT, MPT, S2-PD, and DD (p <= 0.046) indicated significantly higher somatosensory function at 18 M than that at 9 M. MDT and MPT (p <= 0.038) showed significantly higher sensitivity at 18Mc than at 9Mc. Scores for all dimensions of OHIP-49 were significantly higher in patients (decrease in quality of life, p <= 0.002) than in controls, except for physical discomfort (p = 0.51). However, the scores were significantly higher at 18 M than at 9 M (p <= 0.011), except for handicap (p = 0.36). Postoperative chemotherapy was significantly correlated with impaired thermal sensitivity of the flaps (WDT, p = 0.049). Conclusion: The present findings showed significant impairment in somatosensory function on both the surgical and contralateral sides of patients with RFFFs. However, a significant increase in somatosensory function was observed on both sides over time. Somatosensory disturbances observed after surgery were associated with poor oral health-related quality of life.