Chad A Purnell1, Michael S Gart1, Adrián Buganza-Tepole2, Joanna P Tomaszewski1, Jolanta M Topczewska1, Ellen Kuhl3, Arun K Gosain1. 1. Division of Pediatric Plastic Surgery, Lurie Children's Hospital, Northwestern University Feinberg School of Medicine, Chicago, Illinois. 2. Department of Mechanical Engineering, Stanford University, Stanford, California. 3. Departments of Mechanical Engineering, Bioengineering, and Cardiothoracic Surgery, Stanford University, Stanford, California.
Abstract
BACKGROUND: The relative effects of skin growth and stretch during tissue expansion have not been studied. The authors use novel analytic techniques that allow calculation of these factors at any point of a skin patch. OBJECTIVE: The authors sought to determine how stretch and growth change with different expansion rates and to correlate these values with histologic and cellular changes in skin. MATERIALS AND METHODS: Two minipigs were implanted with a total of 5 tissue expanders under tattooed skin grids. One pig was expanded over 35 days and the second over 15 days. Isogeometric analysis allowed calculation of growth and stretch. Expanders with similar total deformation were compared between protocols. Regression analysis determined predictive effects of stretch and growth on histologic data from the second animal. RESULTS: Deformation was more attributable to stretch in rapid than in slow expansion (1.40 vs1.12, p < .001). Growth was higher in slow expansion than in rapid (1.52 vs 1.07, p < .001). Both growth and stretch predicted epidermal thickness, dermal thinning, and keratinocyte proliferation. Growth predicted vascularity. CONCLUSION: Isogeometric analysis allows determination of precise surface area changes for correlation to microscopic-level data. Using the model, the authors identified that skin deformation in rapid expansion is more attributable to stretch.
BACKGROUND: The relative effects of skin growth and stretch during tissue expansion have not been studied. The authors use novel analytic techniques that allow calculation of these factors at any point of a skin patch. OBJECTIVE: The authors sought to determine how stretch and growth change with different expansion rates and to correlate these values with histologic and cellular changes in skin. MATERIALS AND METHODS: Two minipigs were implanted with a total of 5 tissue expanders under tattooed skin grids. One pig was expanded over 35 days and the second over 15 days. Isogeometric analysis allowed calculation of growth and stretch. Expanders with similar total deformation were compared between protocols. Regression analysis determined predictive effects of stretch and growth on histologic data from the second animal. RESULTS: Deformation was more attributable to stretch in rapid than in slow expansion (1.40 vs1.12, p < .001). Growth was higher in slow expansion than in rapid (1.52 vs 1.07, p < .001). Both growth and stretch predicted epidermal thickness, dermal thinning, and keratinocyte proliferation. Growth predicted vascularity. CONCLUSION: Isogeometric analysis allows determination of precise surface area changes for correlation to microscopic-level data. Using the model, the authors identified that skin deformation in rapid expansion is more attributable to stretch.
Authors: Elliot M Hirsch; Akhil K Seth; Gregory A Dumanian; John Y S Kim; Thomas A Mustoe; Robert D Galiano; Neil A Fine Journal: Plast Reconstr Surg Date: 2012-02 Impact factor: 4.730
Authors: Taeksang Lee; Maria A Holland; Johannes Weickenmeier; Arun K Gosain; Adrian Buganza Tepole Journal: J Mech Phys Solids Date: 2020-10-17 Impact factor: 5.471
Authors: Joanna K Ledwon; Elbert E Vaca; Chiang C Huang; Lauren J Kelsey; Jennifer L McGrath; Jacek Topczewski; Arun K Gosain; Jolanta M Topczewska Journal: J Cell Mol Med Date: 2022-01-12 Impact factor: 5.310