Margins of Safety in Lateral Orbitotomy

Simonton, John T.; Garber, Perry F.; Ahl, Norman C.

doi:10.1001/archopht.1977.04450070127012

Cited by 10 publications

(3 citation statements)

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“…The lateral orbital wall about 30 mm from the orbital rim is very thick [14]. With blow-in fractures of the lateral orbital wall, skull fractures, eyeball ruptures and optic nerve injuries might occur [15,16,17].…”

Section: Discussionsupporting

confidence: 40%

Myoneural Junctions of Extraocular Muscles: Distances from the Orbital Rim and Widths

Kakizaki¹,

Zako²,

Nakano³

et al. 2006

Ophthalmologica

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Purpose: To examine both the distances from the orbital rim to the myoneural junctions (MNJs) and the widths of the MNJs of all extraocular muscles. Methods: Six orbits of 3 post-mortem cadavers were used. The cadavers (1 female and 2 males) were all Japanese with an average age of 76.3 years. The MNJs of the extraocular muscles and their motor nerves were exposed, and then the distance from the orbital rim to each MNJ and the width of each MNJ were examined. Results: The distance from the orbital rim to each MNJ in the 6 extraocular muscles ranged from 24.4 to 33.6 mm and the width of each MNJ ranged from 5.0 to 8.5 mm. Conclusions: It is essential for orbital surgeons to understand both the distance from the orbital rim to MNJs and the widths of MNJs. This information not only aids the understanding of MNJ damage, but also prevents iatrogenic nerve impairment during orbital surgery.

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Section: Discussionsupporting

confidence: 40%

Myoneural Junctions of Extraocular Muscles: Distances from the Orbital Rim and Widths

Kakizaki¹,

Zako²,

Nakano³

et al. 2006

Ophthalmologica

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“…There are only few papers in the available literature, which could be referred to the results obtained in this study. Simonton et al [20] determined safe distances for lateral orbitotomy, but their measurements were closely related to the cranial cavity. In our study we have described distinctive topographical points, which are easy to find in the orbit entrance plane.…”

Section: Discussionmentioning

confidence: 99%

Morphometry of the Orbit in East-European Population Based on Three-Dimensional CT Reconstruction

Nitek

Bakoń

Sharifi

et al. 2015

Advances in Anatomy

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Objectives. To determine safe distances within the orbit outlining reliable operative area on the basis of multislice computed tomography (MSCT) scans.Patients and Methods. MSCT of orbits of 50 Caucasian patients (26 males and 24 females, mean age 56) were analysed. Native scans resolutions were in all cases 0.625 mm. Measurements were done in postprocessing workstation with 2D and 3D reconstructions. The safe distances values were calculated by subtracting three standard deviations from the arithmetical average(X=AVG-3 STD). This method was chosen because this range covers 99.86% of every population.Results. The results of the measurements in men and women, respectively, are as follows (1) distance from optic canal to supraorbital foramen, mean 46,49 mm and 43,29 mm, (2) distance from the optic canal to maxillozygomatic suture at the inferior margin of the orbit mean 45,24 mm and 42,8 mm, (3) distance from the optic canal to frontozygomatic suture 46,15 mm and 43,58 mm, (4) distance from the optic canal to anterior lacrimal crest 40,40 mm and 38,39 mm, (5) distance from superior orbital fissure to the frontozygomatic suture 34,06 mm and 32,62 mm, and (6) distance from supraorbital foramen to the superior orbital fissure 42,32 mm and 39,39 mm.Conclusion. The most probable safe distances calculated by adopted formula were for the superior orbital fissure 23,39–30,58 mm and for the orbital opening of the optic canal 31,9–38,0 mm from the bony structures of the orbital entrance depending on the orbital quadrant.

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“…During lateral orbitotomy surgery, the superior bone cut is usually made just above the frontozygomatic suture, at which point the middle cranial fossa is in close proximity. 6 The lateral wall removal is completed by fracturing the bone at the zygomaticosphenoid suture.…”

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confidence: 99%

Update on orbital anatomy

René

2006

Eye

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The orbit is a confined space bounded by four bony walls. Apart from the globe, orbital fat, and extraocular muscles it contains many important neurovascular structures. It is intimately related to the paranasal sinuses as well as the anterior and middle cranial fossae. Consequently, sinus pathology and intracranial disease may spread to involve the orbit and the converse applies. A thorough understanding of orbital anatomy is essential to fully appreciate the effects of disease on the orbit and is of paramount importance for performing safe orbital surgery. The anatomy of the orbit is discussed with reference to relevant orbital disease.

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Margins of Safety in Lateral Orbitotomy

Cited by 10 publications

References 1 publication

Myoneural Junctions of Extraocular Muscles: Distances from the Orbital Rim and Widths

Myoneural Junctions of Extraocular Muscles: Distances from the Orbital Rim and Widths

Morphometry of the Orbit in East-European Population Based on Three-Dimensional CT Reconstruction

Update on orbital anatomy

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