Histologic Evaluation of Piezotome and Traditional Osteotomy Techniques in Posterior Maxillary Rhinoplasty.

Rhinoplasty is the fifth most commonly performed cosmetic surgery globally. While surgical techniques used for rhinoplasty have evolved significantly in the past century, the creation of precise osteotomies remains a cornerstone of the procedure. Recently, piezotomes have been associated with reduced postoperative pain, edema, ecchymosis, complications, and revision rates in rhinoplasty. Despite these clinically significant benefits, there remains a paucity of histologic analysis of osteotomies performed with piezotomes in a large translational preclinical model. In this study, n=12 adult sheep underwent lateral rhinoplasty of the posterior maxilla using each of the three surgical devices: piezotome, manual osteotome, and oscillatory saw. Subjects were randomized to heal for either 3 or 12 weeks postoperatively (n = 6 animals per cohort). En bloc samples were processed and analyzed histologically. A semiquantitative healing scale was used to quantify bony ingrowth into the osteotomy. Wilcoxon signed-rank tests were used to analyze the outcome variable. No statistically significant differences in semiquantitative grades were observed among groups (p > 0.05) at either time point. However, the piezotome was associated with more uniform, reproducible, and smoother osteotomy walls, and smaller bone chips at 3 weeks. At 12 weeks, all osteotomy techniques had complete or near-complete osteogenesis. Use of the piezotome did not completely prevent soft tissue injury. Some osteotomies demonstrated full-thickness penetration and injury to the underlying cartilage. All groups demonstrated comparable healing outcomes after 12 weeks. However, histologic results indicate that reliance solely on device technology may not be sufficient. Clinical judgement of these techniques and relevant case presentations is required to minimize unintended tissue injury.