Patient-specific puzzle implant preformed with 3d-printed rapid prototype model for combined orbital floor and medial wall fracture

Publication date: Available online 29 November 2017
Source:Journal of Plastic, Reconstructive & Aesthetic Surgery
Author(s): Young Chul Kim, Kyung Hyun Min, Jong Woo Choi, Kyung S. Koh, Tae Suk Oh, Woo Shik Jeong
BackgroundThe management of combined orbital floor and medial wall fractures involving the inferomedial strut is challenging due to absence of stable cornerstone. In this article, we proposed surgical strategies using customized 3D puzzle implant preformed with Rapid Prototype (RP) skull model.MethodsRetrospective review was done in 28 patients diagnosed with combined orbital floor and medial wall fracture. Using preoperative CT scans, original and mirror imaged RP skull models for each patient were prepared and sterilized. In all patients, porous polyethylene-coated titanium mesh was premolded onto RP skull model in two ways; Customized 3D jigsaw puzzle technique was used in 15 patients with comminuted inferomedial strut, whereas individual 3D implant technique was used in each fracture for 13 patients with intact inferomedial strut. Outcomes including enophthalmos, visual acuity, presence of diplopia were assessed and orbital volume was measured using OsiriX software preoperatively and postoperatively.ResultsSatisfactory results were achieved in both groups in terms of clinical improvements. Of 10 patients with preoperative diplopia, 9 improved in 6 months, except one with persistent symptom who underwent extraocular muscle rupture. 18 patient who had moderate to severe enophthalmos preoperatively improved, and one remained with mild degree. Orbital volume ratio, defined as volumetric ratio between affected and control orbit, decreased from 127.6% to 99.79% (p<0.05) in comminuted group, and that in intact group decreased from 117.03% to 101.3% (p<0.05).ConclusionOur surgical strategies using the jigsaw puzzle and individual reconstruction technique provide accurate restoration of combined orbital floor and medial wall fractures.