Scleral reactions to different suture materials: A comparative quantitative histological study in a rabbit model

Area of Science:

• Ophthalmology
• Surgical Materials Science
• Histopathology

Background:

• Scleral fixation of intraocular lenses is a crucial surgical alternative when capsular bag placement is not feasible.
• Understanding scleral tissue reactions to various suture materials is essential for optimizing surgical outcomes.
• Microscopic changes in scleral tissue following implantation of different suture types require detailed investigation.

Purpose of the Study:

• To histologically evaluate and compare the scleral tissue response to polytetrafluoroethylene (PTFE) chain, PTFE fiber, and polypropylene (PPE) fiber suture materials.
• To quantify leukocyte infiltration and changes in collagen types I and III in scleral tissue at different postoperative time points.

Main Methods:

• Rabbit eyes were divided into six groups: PTFE chain, PTFE fiber, PPE fiber, and control groups.
• Histological analysis involved multilevel sampling and stereological methods for quantitative assessment.
• Key parameters evaluated included leukocyte infiltration fractions and the ratio of type I to type III collagen.

Main Results:

• All tested suture materials induced inflammation in the surrounding scleral tissue compared to controls.
• Leukocyte infiltration levels were not significantly different among the various suture materials.
• Significant collagen alterations were observed, with PTFE fiber showing the greatest changes at 2 weeks and PTFE chain at 4 weeks; PPE fiber exhibited the least significant changes.

Conclusions:

• Scleral suture materials induce quantifiable histological differences compared to untouched sclera.
• Distinct variations in scleral tissue response exist among different suture materials (PTFE vs. PPE) and over time.
• The findings provide crucial histological insights into the biocompatibility of scleral suture materials for intraocular lens fixation.