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Stability of the postoperative alignment in adjustable-suture strabismus surgery
B Weston1, R W Enzenauer, S P Kraft
1Department of Ophthalmology, University of Toronto, Ontario, Canada.
Journal of Pediatric Ophthalmology and Strabismus
|July 1, 1991
Summary
Adjustable suture rectus muscle surgery for strabismus shows predictable alignment drifts. Postoperative adjustments are common, with specific drift patterns guiding surgical targets for esotropia, exotropia, and hypertropia.
Area of Science:
- Ophthalmology
- Strabismus Surgery
- Ocular Motility
Background:
- Postoperative alignment drift is a known complication of strabismus surgery.
- Adjustable sutures offer intraoperative flexibility but require understanding of long-term alignment changes.
Purpose of the Study:
- To analyze postoperative alignment drift in patients undergoing rectus muscle surgery with adjustable sutures.
- To determine if primary surgeries and reoperations exhibit different drift patterns.
- To establish optimal alignment targets based on observed drift.
Main Methods:
- Review of 201 patients (ages 14-75) who had rectus muscle surgery with adjustable sutures (1984-1989).
- Analysis of alignment drift in primary esotropia (ET), reoperation ET (groups IA, IB), primary exotropia (XT), reoperation XT (groups IIA, IIB), and hypertropia (HT) (group III).
- Follow-up of at least 8 weeks, with 66% followed for 6 months or longer.
Main Results:
- Forty percent of patients required postoperative muscle adjustment.
- No significant difference in drift between primary surgeries and reoperations for ET or XT.
- Mean drifts: 1.3 eso (IA), 1.2 exo (IB), 4.8 exo (IIA), 4.1 exo (IIB), 1.5 hyper (III).
- Drifts in groups IIA and IIB were significantly different from zero.
Conclusions:
- Postoperative alignment drift is measurable and predictable after adjustable suture strabismus surgery.
- Specific drift patterns observed for ET, XT, and HT guide the selection of intraoperative alignment targets.
- Aligning ET to orthotropia, XT to 5-7 prism diopters esotropic, and HT to 1-2 prism diopters hypotropic may optimize outcomes.