Anatomy-based surgical concepts for individualized orbital decompression surgery in graves orbitopathy. II. Orbital rim position and angulation.
OBJECTIVE
To detect anatomical conditions that may benefit from an orbital rim advancement procedure in patients suffering from Graves orbitopathy.


METHODS
In postprocessed 70 clinical CTs from adults of white European ethnicity with unaffected orbits, the authors assessed the intra- and interindividual variability of the orbital rim angulation and orbital rim position relative to their medial rim parts. This included morphometrical analysis and computer model visualization using Amira software (version 5.3.1, Visage Imaging GmbH, Berlin, Germany).


RESULTS
Significant variation was observed in rim angulation, varying up to 16.6° in different individuals. A large variability of the sagittal rim position became evident, with the highest at the lateral orbital rim being 1.1 cm.


CONCLUSIONS
These anatomical data may be used to benchmark the given Graves orbitopathy patients. CT assessment to detect and quantify orbital rim pro-/retrusion may help to decide whether orbital rim advancement may be considered for orbital decompression/enlargement.
AO Research Institute Davos, 7270 Davos Platz, Switzerland. lukas.kamer@aofoundation.org
Lukas
L
Kamer
Hansrudi
H
Noser
Eberhard
E
Kirsch
Beat
B
Hammer
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019299:Decompression, Surgical; D005260:Female; D049970:Graves Ophthalmopathy / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D009916:Orbital Diseases / Q000000981:diagnostic imaging / Q000601:surgery*; D014057:Tomography, X-Ray Computed; D055815:Young Adult