Abstract
Purpose
To compare the degree of postoperative medial rectus (MR) muscle misalignment in patients who underwent medial orbital wall decompression with or without a periosteal flap along the MR muscle.
Methods
This retrospective, observational study included 40 sides from 26 patients. The following parameters were measured on axial computed tomographic images taken post- and/or preoperatively: the distance of the anteroposterior line between the posterior lacrimal crest and the junction of the ethmoid and sphenoid sinuses from the most medial point of the medial margin of the MR muscle; the angle created at the point of the MR globe insertion, the most medial point of the MR muscle, and the junction of the ethmoid and sphenoid sinuses; and the MR muscle cross-sectional area. Postoperative changes in the distance (MR muscle shift) and area (MR muscle expansion) were calculated, and MR muscle shift, MR muscle angle, and the rate of MR muscle expansion were compared between the groups with (22 sides) and without (18 sides) a periosteal flap.
Results
MR muscle shift (P = 0.325), MR muscle angle (P = 0.219), and the rate of MR muscle expansion (P = 0.904) were not significantly different between the groups.
Conclusions
Preservation of the periosteum along the MR muscle is thought to prevent MR muscle misalignment after medial orbital wall decompression. However, the results of this study indicate that preservation of a periosteal flap may not contribute to lessening MR muscle shift after surgery.
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This study was approved by the Institutional Review Board (IRB) of Aichi Medical University Hospital (approval No, 2019–034) and followed the tenets of the 1964 Declaration of Helsinki.
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The IRB granted a waiver of informed consent for this study based on the ethical guidelines for medical and health research involving human subjects established by the Japanese Ministry of Education, Culture, Sports, Science, and Technology and the Ministry of Health, Labour, and Welfare. The waiver was granted because the study was a retrospective chart review, not an interventional study, and because it was difficult to obtain consent from patients who had been treated several years prior to the study. Nevertheless, at the request of the IRB, we published an outline of the study, which is available for public viewing on the Aichi Medical University Hospital website. This public posting also allowed patients the opportunity to decline participation, although none of the patients did so. Personal identifiers were removed from all records before data analysis.
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Takahashi, Y., Vaidya, A., Yo, K. et al. Comparison of degree of medial rectus muscle misalignment after medial orbital wall decompression with or without periosteal flap. Graefes Arch Clin Exp Ophthalmol 260, 1025–1031 (2022). https://doi.org/10.1007/s00417-021-05413-8
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DOI: https://doi.org/10.1007/s00417-021-05413-8