March 2012
Volume 53, Issue 14
Free
ARVO Annual Meeting Abstract  |   March 2012
Tensile Strenght of Sclera at Different Suture Depths
Author Affiliations & Notes
  • Larry Puthenparambil
    Ophthalmology, UT Southwestern, Dallas, Texas
  • Sohail Khan
    Ophthalmology, UT Southwestern, Dallas, Texas
  • Yuguang He
    Ophthalmology, UT Southwestern, Dallas, Texas
  • Footnotes
    Commercial Relationships  Larry Puthenparambil, None; Sohail Khan, None; Yuguang He, None
  • Footnotes
    Support  UT Southwestern Medical School
Investigative Ophthalmology & Visual Science March 2012, Vol.53, 4906. doi:
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      Larry Puthenparambil, Sohail Khan, Yuguang He; Tensile Strenght of Sclera at Different Suture Depths. Invest. Ophthalmol. Vis. Sci. 2012;53(14):4906.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract
 
Purpose:
 

To look at the tensile strength of sclera when a single suture is passed at different depths through donor sclera.

 
Methods:
 

Two donor sclera were used within 48 hours of death. These sclera were cut into four quadrants and each quadrant had 5 0 nylon suture were passed at different depths (25%, 50%, 75%, full-thickness) by a single surgeon. The depths were checked using anterior segment OCT. The force was measured, in kg, using a Berkeley weighing scale.

 
Results:
 

The mean force needed to tear the sclera for each depth was as follows: 25% thickness (0.23 kg), 50% thickness (0.42 kg), 75% thickness (0.84 kg) and 100% thickness (1.33 kg). It was noted that the full thickness scleral depth actually was the strength of the suture, as the suture tore before the sclera tore. The forces for each depth when compared to each other were statistically significant when using a p-value <0.05.

 
Conclusions:
 

The strength of the donor sclera was noted to increase significantly the deeper the suture was passed, almost double for each subsequent depth. The strength of the full thickness sclera was not able to be assessed in this experiment as the suture broke before the sclera gave away. The sclera showed remarkable resiliency and strength even at shallow depths, but the deeper passes showed more stability as it took more force to tear these sutures.  

 

 
Keywords: sclera • depth 
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