Effects of 360-degree pedicle torsion on island skin flaps: experimental study in rats

This study was carried out to observe the isolated effects of pedicle torsion on island skin flaps, without further damaging the pedicle. Twelve adult male Sprague-Dawley rats, weighting 240 to 300 gr, were used, and hexagonal flaps with edges measuring 1.5 cm and pedicles measuring 1 cm in length were raised in the inguinal region. The animals were divided into two groups. In Group A, flaps were re-sutured to the donor beds without any rotation. In Group B, flaps were rotated 360 degrees, applying the same degree of torsion to their pedicles before re-suturing. After 7 days, the percentage of surviving skin areas of the flaps was determined by planimetry, and transverse sections of the flaps and pedicles were taken and evaluated in terms of signs of arterial or venous insufficiency. Statistically significant differences between the groups were determined by analyses using the multiple comparisons test. Pedicle torsion in Group B did not affect flap viability, both macroscopically and microscopically. The presented study shows that 360-degree torsion applied to the pedicle of the flap in this model had no effect on flap viability.