Correction of lower eyelid retraction combined with entropion in thyroid eye disease patients of East Asian ancestry.

PURPOSE: This study evaluates causes and treatment of lower eyelid retraction with co-existing entropion in Thyroid Eye Disease (TED) patients of East Asian ancestry. METHODS: The medical records for 25 eyelids from 15 TED patients with lower eyelid retraction and entropion who had undergone combined orbital decompression and lower eyelid retraction correction surgery at the Second Hospital of Dalian Medical University from January 2017 to December 2018 were prospectively reviewed. We build a numerical model of biomechanics to analyze von Mises stress and displacement at the lower eyelid. RESULTS: The mean follow-up duration was 6 ± 2 months. The difference of mean exophthalmos was 5.16 ± 1.21 mm (t = 21.26, p = 4.479E-17 < 0.05). The difference of mean MRD2 was 1.9 ± 0.14 mm (t = 67.57, p = 6.751E-29 < 0.05). About 2 of 25 eyelids entropion recurred postoperatively; the overall success rate was 92%. The biomechanical analysis results reveal that the eyelid margin is given more stress and caused more displacement in East Asian ancestry under the same force of pressure. CONCLUSIONS: This study shows that the lower eyelid retraction with coexistent entropion is attributable to the unique anatomical features of patients of East Asians ancestry. We corrected the lower eyelid retraction and entropion during the orbital decompression operation. The results show that this method is safe and effective. It can simultaneously improve the symptoms of TED patients such as exophthalmos, lower eyelid retraction, and entropion, with minimal complications.

Inadvertent Intraocular Soft Tissue Filler Injection During a Facial Enhancement Procedure.

Iatrogenic needle penetrating ocular injuries are rare but can result in serious consequences. The authors report a case of inadvertent intraocular hyaluronic acid injection during esthetic periorbital facial enhancement. Visual field, visual evoked potential, and electroretinogram were used for monitoring potential side effects.

Finite Element Analysis of 2- and 3-Point Internal Fixation Methods for the Treatment of Zygomaticomaxillary Complex Fracture.

Open reduction followed by internal fixation (ORIF) has been regarded as the most effective technique for surgical repair of zygomaticomaxillary complex (ZMC) fractures. However, the ideal internal fixation method to achieve stable reduction remains controversial. This research aims to assess and compare the stability of the 2- and 3-point screw-plate fixation methods using finite element method (FEM). Based on computed tomography (CT), the finite element models of 2-point (ZFS + IOR) and 3-point (ZFS + IOR + ZMB) fixation for isolated displaced ZMC fracture were reconstructed. The force of 120 N was applied to the models to simulate the masseter muscle strength. The maximum stress and displacement of the 2 models were measured to compare the stability. Two geometrically accurate and finite element models were reconstructed successfully. In both the 2- and 3-point fixation models, the maximum stress was significantly lower than the mechanical properties of pure titanium and titanium alloys and the maximum displacement was ≤0.1 mm. The results of this study suggested that both 2- and 3-point fixation of isolated displaced ZMC fractures provide good stability. The FEM innovatively applied in this study can not only show the biomechanical properties of the orbital skeleton and masseter muscle but also assess the stability of the two fixation methods and provide a theoretical reference. This study verifies the effectiveness of 2-point fixation and combined with the clinical benefits of reduced incisions, shorter operative time and lower cost, make this an attractive method.