Botulinum neurotoxin injection for treating plunged nose and post-rhinoplasty: anatomical perspectives of depressor septi nasi, nasalis, leveator labii superioris alaeque nasi muscle

Botulinum neurotoxin (BoNT) injection for the treating plunged nose, post-rhinopasty and hyaluronic filler migration is common procedures in clinical settings. However, the lack of thorough anatomical understanding makes it difficult to locate the nose region muscles. The anatomical considerations concerned with BoNT injection into the nasalis, levator labii superioris alaeque, and depressor septi nasi muscles were reviewed in this study. The injection spots have been presented for the nasalis, levator labii superioris alaeque, and depressor septi nasi muscles, with the recommended injection technique for each muscle. We have suggested the ideal injection sites in association with outer anatomical landmarks of the nose region. Moreover, these proposals would support a more accurate procedure of BoNT injection in relieving plunged nose, preventing post-rhinoplasty deviation, and migration of the hyaluronic acid filler.

Effects of the Rhinoplasty Maneuvers on Upper Lip Position and Incisor Show

BACKGROUND

Smiling involves dynamic movements that include nasal tip descent and upper lip ascent. The effect of rhinoplasty on upper lip position is poorly described.

METHODS

One hundred charts were reviewed in reverse chronologic order. Inclusion criteria were receiving one of the rhinoplasty maneuvers of interest, at least 6 months of follow-up, and pre- and postoperative photographs by a professional medical photographer with matching maximum smile extent and size. Maxillary incisor show was measured as the vertical distance between the caudal border of the upper lip and the caudal-most aspect of maxillary central incisors. Pre- and postoperative maxillary incisor show was compared by open versus closed approach and rhinoplasty maneuver with and without controlling for depressor septi nasi (DSN) release.

RESULTS

Sixty-one females and fifteen males with a mean age of 39 years and mean follow-up of 16 months were included. No significant differences were seen between open versus closed approaches (p > 0.05). A decrease in postoperative maxillary incisor show was observed following columella strut, extended spreader graft, and DSN release (p < 0.05). No significant change in maxillary incisor show was seen after nasal spine graft, maxillary augmentation, tip rotation suture, shield graft, columella retraction, or tip suspension suture (p > 0.05). Patients undergoing footplate approximation and alar base resection had a significant decrease in maxillary incisor show (p < 0.05), but this significance was lost upon controlling for DSN release (p > 0.05).

CONCLUSION

Certain caudal rhinoplasty maneuvers may result in decreased maxillary incisor show, particularly when the DSN muscles are involved. Examination of upper lip position and patient discussion is important for maximizing outcome.

LEVEL OF EVIDENCE IV

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