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- Title
Accuracy of the Ultrasound Biomicroscopy Bag/Balloon Technique in Locating Horizontal Extraocular Muscle Insertions Before and After Strabismus Surgery.
- Authors
Mezad-Koursh, Daphna; Rosenblatt, Amir; Cohen, Shai; Neudorfer, Meira; Keynan, Idit; Stolovitch, Chaim; Zur, Dinah
- Abstract
Purpose: To investigate the accuracy of high frequency ultrasound biomicroscopy using the bag/balloon technique to locate recti muscle insertions before and after strabismus surgery. Methods: This was a prospective masked study. The distance from the limbus to horizontal recti muscle insertions was measured by caliper intraoperatively and ultrasound biomicroscopy preoperatively and during follow-up. Accuracy was defined as the difference between ultrasound biomicroscopy and caliper measurements. Results: Thirty-nine muscles (19 medial rectus and 20 lateral rectus) of 22 patients were included. The mean age of the patients was 34.7 ± 15.5 years (range: 18 to 78 years). Follow-up measurements were available for 25 muscles: 12 muscles were recessed and 13 were resected/advanced. Twelve of the included muscles underwent prior surgery. There was a strong correlation between preoperative mean ultrasound biomicroscopy and caliper measurements (Thirty-nine muscles (19 medial rectus and 20 lateral rectus) of 22 patients were included. The mean age of the patients was 34.7 ± 15.5 years (range: 18 to 78 years). Follow-up measurements were available for 25 muscles: 12 muscles were recessed and 13 were resected/advanced. Twelve of the included muscles underwent prior surgery. There was a strong correlation between preoperative mean ultrasound biomicroscopy and caliper measurements (P <.001, rp = 0.872) without significant difference between the accuracy of identification of medial rectus and lateral rectus muscles (P =.116 and.377, respectively). On average, postoperative ultrasound biomicroscopy measurements of recessed muscles were 1.15 mm greater than caliper measurements at the end of surgery (P =.003), whereas the mean difference in the resected muscles was not statistically significant (−0.07 mm, P >.999). Overall, in 16 of 25 muscles (64%), the differences between the postoperative measurements and the end of surgery measurements were less than 1 mm. There was no correlation between the accuracy and the time of ultrasound biomicroscopy after surgery (P =.516). Conclusions: The ultrasound biomicroscopy bag/balloon technique is an accurate and reliable method of locating recti muscle insertions before and after strabismus surgery. Ultrasound biomicroscopy may assist strabismologists in planning repeated operations. [[J Pediatr Ophthalmol Strabismus. 2020;57(1):12–20.]
- Subjects
STRABISMUS surgery; MUSCLES; BALLOONS; BAGS; LONGITUDINAL method; STRABISMUS
- Publication
Journal of Pediatric Ophthalmology & Strabismus, 2020, Vol 57, Issue 1, p12
- ISSN
0191-3913
- Publication type
Article
- DOI
10.3928/01913913-20191115-01