Bilateral Lower Limb Injuries and the Need for Two Free Flaps: Simultaneous or Sequential.

To determine the choice of flap cover for patients presenting with bilateral lower limb trauma requiring free flap cover and to derive a step-wise guide to the planning of bilateral lower limb free flaps.  This was a retrospective study of patients over a 20 year period from 2000 to 2020 who presented with bilateral lower limb defects following trauma and were managed with two free flaps for wound cover, done either simultaneously or sequentially in the same admission.  Of the 11 cases with 22 defects, there were 3 re-explorations with 1 flap loss managed with delayed fasciocutaneous flap cover. Donor morbidity was minimal requiring aspiration of seroma for 1 patient and secondary SSG for recipient area graft loss over muscle flap in 2 patients.  Use of single donor site ensures economy of time and tissue with the use of skin and muscle chimeric flaps. Harvesting of twin ALT flaps or the use of lattisimus dorsi as one of the flaps requires a 2 stage surgery to avoid prolonged operative time.