Fig. 2

Representative images of two cases in group A (A–C) and group B (D–F). A–C A 51-year-old male farmer suffered a machine twist injury that resulted in severe skin defect of the dorsal part of his left thumb. A Appearance of the affected hand after debridement. Exposure of thumb extensor tendon could be observed with a full-thick skin defects about 3.5 cm × 5.0 cm. B SIS patch with a suitable size was used to cover the skin defect area, and the edge was sutured to the wound around. C Appearance of the affected hand during the last time follow-up. The result of the SCAR scale was 13 and the sensation of the newborn skin was S4 according to the BMRC grading system. D–F A 28-year-old male worker suffered a sharp injury that resulted in skin defect of the radial part of his right first metacarpophalangeal joint. D Appearance of the affected hand after debridement. A full-thick skin defects about 2.0 cm × 3.0 cm could be observed. E Autologous full-thick skin graft was selected to cover the defect area. F Appearance of the affected hand during the last time follow-up, and texture mismatch and scar hyperplasia could be observed. The result of the SCAR scale was 8 and the sensation of the newborn skin was S3 according to the BMRC grading system