眼窩底骨折の術後に眼球の下転障害を呈し，異なる予後を示した2例

Different outcomes in two cases manifesting restricted infraduction following surgery for of orbital floor fracture

要約　2例の眼窩底骨折に対してシリコンプレートの挿入手術を行った。1例は16歳男子でボクシングで受傷し，直後から嘔気と複視があった。受傷3日後に手術を行った。骨折は跳ね上げ戸型で，骨折部位に眼窩内組織が嵌頓していた。下転障害が残り，12か月後に患側の下直筋短縮術を行った。骨折部に絞扼された下直筋に麻痺があったと推定した。他の1例は19歳男子で角材で右眼を殴打され，複視があった。受傷12日後に手術を行った。骨折は穿孔型で，術後の下転障害は3か月で改善した。眼窩底骨折での手術後の経過には骨折の型が関与する。

Abstract.　We treated two cases of orbital floor fracture by inserting a silicone plate. A 16-year-old boy was injured during boxing. He had nausea and diplopia immediatefly after injury. During surgery 3 days later,the fracture was found to be of trapdoor type. Orbital tissue was entrapped in the fractured site. Resection of ipsilateral inferior rectus muscle had to be performed 12 months later for residual restriction of infraduction. The inferior rectus muscle appeared to be paralyzed due to entrapping in the fractured site. Another 19-year-old boy was hit by a timber on his right eye. Surgery was performed 12 days later for diplopia. The orbital floor fracture was found to be of punched-out type. Postoperative restriction of infraduction disappeared 3months later. These cases illustrate that the outcome of surgery for orbital floor fracture may be variable dependent on the type of fracture.