方法：回顾性分析儿童Trapdoor眼眶骨折患者55例55眼，骨折部位均为单纯性下壁骨折。所有骨折患者均采用下睑结膜入路，术中还纳嵌顿的眼外肌及眶组织，修剪可吸收眶底板成适当大小并塑形后植入眶内。通过患者术前术后的眼部检查及眼眶CT扫描来评价儿童Trapdoor眼眶骨折的治疗效果。采用重复测量的方差分析比较不同手术时机的患者术后效果评价指标的差异。

结果：所有患者术中术后未出现严重的并发症，通过术后的眼眶CT检查发现骨折都得到良好的解剖复位，经手术治疗患者复视、眼球运动受限均较术前明显恢复，手术时间距离受伤时间越早，术后恢复效果越好。同时可吸收眶底板在儿童Trapdoor眼眶骨折修复术中应用效果良好，是一种较好的眼眶修复材料。

结论：手术是治疗儿童Trapdoor眼眶骨折的有效方法，受伤后应尽早手术，并且可吸收眶底板是一种较好的眼眶修复材料。

METHODS: Retrospective analysis of 55 cases(55 eyes)orbital Trapdoor fractures in children. The fracture site was simple orbital floor fracture. All patients were approached by palpebral conjunctiva of lower eyelid. During operations, the embedded extraocular muscles and orbital tissues were returned. A resorbable implant was implanted into the orbit after trimming to proper sizes and shaped according to the fracture defect range. The therapeutic effect was evaluated by preoperative and postoperative ocular examination and orbital CT scan. Repeated measure analysis of variance was used to compare the differences of postoperative outcome evaluation indexes among patients with different operation timing.

RESULTS: No serious complications happened during and after surgeries in all patients. The postoperative CT scan showed that the fractures had good anatomical restoration. After the operation, diplopia and limitation of extraocular muscle movement(EOM)recovered obviously. The earlier the operation performed after the injury, the better the postoperative recovery effect was. At the same time, the resorbable implant could repair orbital Trapdoor fracture in children well. It serves as a better material of orbital fracture repairment.

CONCLUSION: Operation is an effective method to treat orbital Trapdoor fracture in children, and should be performed as soon as possible after injury. The resorbable implant is a good orbital repair material.