Background:The big data provided by Health Insurance Review and Assessment (HIRA) contains data from nearly all Korean populations enrolled in the National Health Insurance Service. We aimed to identify the incidence of facial fractures and its trends in Korea using this big data from HIRA. Methods: We used the Korean Standard Classification of Disease and Cause of Death 6, 7 for diagnosis codes. A total of 582,318 patients were included in the final analysis. All statistical analyses were performed using SAS software and SPSS software. Results: The incidence of facial fractures consistently declined, from 107,695 cases in 2011 to 87,306 cases in 2016. The incidence of facial fractures was the highest in June 2011 (n = 26,423) and lowest in January 2014 (n = 10,282). Nasal bone fractures were the most common, followed by orbit and frontal sinus fractures. The percentage of nasal bone fractures declined, whereas those of orbital fractures increased from 2011 to 2016 (P < 0.001). Among orbital fractures, inferior wall fractures were the most common, followed by medial wall fractures. Among mandibular fractures, angle fractures were the most common, followed by condylar process and symphysis fractures. Although it was difficult to predict the most common type of zygomatic and maxilla fractures, their incidence consistently declined since 2011. Conclusion:We observed trends in facial fractures in Korea using big data including information for nearly all nations in Korea. Therefore, it is possible to predict the incidence of facial fractures. This study is meaningful in that it is the first study that investigated the incidence of facial fractures by specific type.

Autologous fat grafting is among the safest and most effective treatments for soft-tissue restoration and augmentation, and many efforts have been made to improve its efficiency, including adipose-derived stem cell (ASC) supplementation. Here, we investigated the role of Notch ligand Delta-like ligand 4 (Dll4) in angiogenesis within grafted fat and its effect on graft retention, as well as the effect of Dll4 inhibition on ASC supplementation. Using a murine fat graft model, we investigated the expression of Dll4 in fat grafts and assessed the graft volume, vascularity, and perfusion within the graft, and ASC differentiation patterns depending on the blockade of Dll4. The underlying mechanism of Dll4 inhibition on ASC supplemented fat grafts was investigated using transcriptome analysis. Dll4 was highly expressed in vascular endothelial cells (ECs) within grafted fat, where Dll4-blocking antibody treatment-induced angiogenesis, promoting fat graft retention. In addition, its effect on fat graft retention was synergistically improved when ASCs were concomitantly supplemented. The expression of junctional proteins was increased in ECs, and inflammatory processes were downregulated in grafted fat upon ASC supplementation and Dll4 inhibition. Dll4 inhibition induced vascularization within the grafted fat, thereby promoting graft retention and exhibiting synergistic effects with concomitant ASC supplementation. This study serves as a basis for developing new potential therapeutic approaches targeting Dll4 to improve graft retention after cell-assisted transfer.

Background Subdermal shaving is a surgical procedure for the treatment of axillary osmidrosis. In this procedure, a direct axillary incision is made, and the apocrine glands are removed. Insufficient subcutaneous tissue removal during subdermal shaving can lead to recurrence due to the presence of remaining apocrine glands, while excessive removal can injure the subdermal plexus and cause skin necrosis. We measured the depth of the apocrine glands from the basement membrane of the epidermis to develop a quantitative method of determining the thickness of the skin flap to be removed. Methods A chart review of patients who underwent subcutaneous shaving to treat osmidrosis between 2012 and 2019 was performed. Axillary subcutaneous tissues were harvested from five randomly chosen patients with osmidrosis before and after surgery. The apocrine gland depth was then measured via immunofluorescence (IF) staining of the collected tissues. A questionnaire was administered to 10 of the patients to investigate postoperative outcomes. Results Of the 47 total patients, six (12.8%) experienced recurrence, seven (14.9%) had complications, four (8.5%) had skin necrosis, two (4.3%) had hematomas, and one (2.1%) had an infection. One patient underwent reoperation due to hematoma. IF staining revealed the mean distance from the basal layer of the epidermis to the apocrine glands to be 1.4312±0.8064 mm. On the questionnaire, the mean patient rating of axillary odor was 8.6 pre-surgery and 4.4 post-surgery. Conclusions During subdermal shaving, the subcutaneous tissue must be preserved up to 14.312±8.064 mm from the epidermal basement membrane to remove the apocrine glands while preserving the subdermal plexus.

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