Comparison of SVF-gel Filling and CO2 Fractional Laser on Atrophic Acne Scar Treatment

"SVF-gel preparation and filling:The autologous fat graft was harvested from the lower abdomen or inner thigh of all subjects. Then the lipoaspirate was centrifuged at 1200g for 3 minutes to obtain Coleman fat in the middle layer. The Coleman fat was then transferred between two syringes until the Coleman fat converted into a uniform emulsion, and then processed by centrifugation at 2000g for 3 min. Finally, the remaining substance under the oil layer was SVF gel. We used a 22G sharp-tip injector to inject the SVF-gel into the dermis of acne scars, and the injected materials were diffusely distributed.~CO2 fractional laser treatment: After local anesthesia, Acupulse device (LUMENIS, US) was used to perform CO2 fractional laser. The laser was operated in DeepFX mode under the parameters of 20-25 MJ energy intensity, 5% coverage. Superficial mode under the parameters of 80-120 MJ energy intensity, 40-60% coverage."