Abstract
Objective
To define an inferior oblique anterior transposition (IOAT) grading scale in patients
with hyperdeviation and inferior oblique overaction (IOOA), which we planned based
on the data we obtained in our previous retrospective study.
Design
Prospective cohort study.
Participants
Thirty-eight patients who underwent graded IOAT.
Methods
The patients were divided into 5 groups according to the amount of hyperdeviation
in the primary position (PPHD). The inferior oblique muscle was transposed 2 mm posterior,
1 mm posterior parallel, 1 mm anterior, and 2 mm anterior to the inferior rectus insertion,
respectively. Surgical success was defined as success (PPHD ≤3 PD), partial success
(PPHD >3 and ≤6 PD), and nonsuccess (PPHD >6 PD).
Results
The mean amount of hyperdeviation correction in groups after IOAT was 9.50 ± 0.9 PD
(range, 8–10 PD), 12.43 ± 1.5 PD (range, 11–14 PD), 16.67 ± 1.4 PD (range, 15–18 PD),
19.57 ± 1.7 PD (range, 16–21 PD), and 22.57 ± 5.8 PD (range, 14–30 PD), respectively.
Surgical success was achieved in 34 patients (89.5%) after surgery, partial success
was achieved in 3 patients (7.9%), and nonsuccess was observed in 1 patient (2.6%).
All patients in our study had unilateral IOOA preoperatively, and IOOA developed in
the contralateral eye of 9 patients (23.7%) during postoperative follow-up. In group
5, 4 patients (57.1%) developed –2 upgaze limitation, but surgery was not required.
Conclusions
A high success rate can be achieved with this grading of IOAT in primary and secondary
IOOA cases accompanying hyperdeviation in the primary position.
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Article Info
Publication History
Published online: March 09, 2022
Accepted:
February 8,
2022
Received in revised form:
December 28,
2021
Received:
November 26,
2021
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2022 Canadian Ophthalmological Society. Published by Elsevier Inc. All rights reserved.
