[Autologous Skin Cell Transplantation and Medical Needling for Repigmentation of Depigmented Burn Scars on UV-protected and UV-exposed Skin]

Background: Burn scars remain a serious physical and psychological problem for the affected people. Both clinical studies and basic scientific research have shown that medical needling can significantly increase the quality of burn scars with comparatively low risk and stress for the patient related to skin elasticity, moisture, erythema and transepidermal water loss. However, medical needling does not influence repigmentation of large hypopigmented scars. Objective: The goal is to evaluate whether both established methods - needling (improvement of scar quality) and non-cultured autologous skin cell suspension (NCASCS) "ReNovaCell" (repigmentation) - can be combined. So far, 20 patients with mean age of 33 years (6-60 years) with deep second and third degree burn scars have been treated. The average treated tissue surface was 94 cm² (15-250 cm²) and was focused on areas like face, neck, chest and arm. Methods: Medical needling is performed using a roller covered with 3 mm long needles. The roller is vertically, horizontally and diagonally rolled over the scar, inducing microtrauma. Then, NCASCS is applied, according to the known protocol. The patients have been followed up for 15 months postoperatively. The scars were subdivided into "UV-exposed" and "UV-protected" to discover whether the improved repigmentation is due to transfer of melanocytes or to reactivation of existing melanocytes after exposure to UV or the sun. Results: The objective measures show improved pigmentation in both UV-exposed and UV-protected groups. Melanin increases 1 year after NCASCS treatment in the UV-protected group are statistically significant. Conclusion: Medical needling in combination with NCASCS shows promise for repigmentation of burn scars, even in sun protected scars.