Usefulness of Interposition Arteriovenous Bundle Grafts in Free Flap Surgery: A Case Series and Systematic Review.

[BACKGROUND] The paucity of reliable recipient vessels adjacent to defects poses a great challenge in free flap reconstruction. Although the use of interposition vein grafts to cover the vascular gap is common, its potential association with higher risks of flap compromise is often reported. Interposition arteriovenous bundle grafts have been introduced as an alternative. This study aimed to evaluate the outcomes of free tissue transfer using interposition arteriovenous bundle grafts and to conduct a systematic review of studies that reported the use of the technique.

[METHODS] Patients who underwent free tissue transfer using the interposition arteriovenous bundle graft technique were assessed for flap perfusion-related complications. A systematic review of literature was performed using pooled analysis to calculate the rate of perfusion-related complications.

[RESULTS] Overall, 14 cases of free flap reconstruction used the interposition arteriovenous bundle graft technique to cover vascular gaps in diverse regions. The most common donor vessel of this graft was the descending branch of the lateral circumflex femoral vessels (mean length, 6.9 cm). All flaps survived except for 1 case of partial flap loss, showing a flap compromise rate of 7.1%. A systematic review identified 13 studies that represented 78 cases using this technique. In the pooled analysis, including the current series, the overall flap survival rate was 95.7%, reporting 4 of 92 cases of flap compromise.

[CONCLUSIONS] The interposition arteriovenous bundle graft technique may help overcome the challenges of pedicle shortage or lack of adjacent recipient vessels in free flap reconstruction.