Vein grafts may only become necessary if long bone segments are required for subtotal mandible reconstruction because in these cases, proximal lengthening by separation from the fibula is only possible to a limited extent.

• 次全下颌骨缺损重建需要长的骨段，必须进行静脉移植；因为在这些情况下血管蒂在腓骨近端只能游离有限的长度。