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筛骨-上颌骨支撑结构(EMBB)是眼眶内壁及下壁交界区域的特殊复合骨结构，该支撑结构对于眼眶及筛窦、上颌窦稳定性的维持具有重要作用。眼眶爆裂性骨折中复合骨折虽较单眶壁骨折发生率低，但具有更加明显的眼球内陷、双眼复视等临床症状。EMBB骨折的病理机制可能更加支持眶底扣压学说，即外力的挤压作用导致筛颌缝处骨膜撕裂、骨缝分离，眶内容由于挤压和重力作用形成“漏斗样”疝出，抑或挤压导致筛骨纸板、上颌骨上壁及筛颌板3处骨质受损断裂移位，造成眶壁大面积塌陷，眶腔明显扩大。近年来针对眼眶内壁及下壁联合骨折的研究成为新的热点，而对于累及EMBB的眼眶爆裂性骨折专题研究报道尚属于起步阶段，目前的眼眶骨折修补技术仅能恢复两眶壁间的联系，而暂无整体恢复EMBB“支架”作用的方案。因此，如何恢复其支架作用，并恢复窦口-鼻道复合体对鼻窦的正常引流是今后EMBB型手术修复需要面临的挑战。本文将重点探讨EMBB的解剖及骨折后临床特点、骨折发生机制和手术修复方案等的研究现状与展望。“,”Ethmo-maxillary bone buttress (EMBB) is a special complex bone structure in the interface between the internal wall and inferior wall of the orbit, which plays a vital role in maintaining the stability of the orbit, ethmoidal sinus and maxillary sinus.Although the incidence of compound fractures in orbital blowout fractures is lower than that of single orbital wall fractures, they have more obvious clinical symptoms such as enophthalmia and binocular diplopia.The mechanism of EMBB may be more supportive of the orbital floor compression theory, that is, the external force will lead to torn periostum and bone seam separation at the ethmoidomaxillary suture, and the orbital contents will form a funnel-like hernia due to extrusion and gravity.Or the extrusion results in the fracture and displacement of the orbital lamina of ethmoid bone, the upper wall of the maxilla and the ethmoidomaxillary plate, causing a large area of orbital wall collapse and obvious expansion of the orbital cavity.Recently, the study of orbital internal wall and inferior wall joint fracture has become a new hotspot, but research on the orbital blowout fracture involving ethmo-maxillary bone buttress is still in its infancy.The current orbital fracture repair technique can only restore the connection between the two orbital walls, and there is no surgical plan can overall recover EMBB's scaffolds role.Therefore, how to restore the scaffolds role of EMBB, and to regain the part of ostiomeatal complex in normal sinus drainage is the challenge we need to conquer.In this article, the anatomy and clinical characteristics of the supporting structure, fracture mechanism, and the research progress and prospect of surgical repair technique were reviewed.