Comparison of the Suture Material Vicryl 6-0 and 7-0 in Strabismus Surgery
Victoria O. Balasanyan, PhD; Elena A. Kudryashova, MD; Erik I. Aznauryan, PhD candidate; Alexander A. Shpak, PhD, D.Sc.; Igor E. Aznauryan, PhD, D.Sc.
Association of Pediatric Ophthalmology Clinics “Yasniy Vzor”
Russian Federation, Moscow
Introduction: Usually dissolving sutures 6-0 are used in the strabismus surgery. Few authors reported the use of 7-0 sutures. The use of thinner needles and sutures leads to a reduction in the injury level, weaker inflammatory reaction and minimal amount of fibrous tissue formed. However, concerns that thin sutures won’t stand strong contractions of oculomotor muscles exist. The goal of this research was to study the relative tensile strength of 6-0 and 7-0 vicryl sutures.
Methods: The research was performed on 20 enucleated pig eyes. The eyeballs were divided into two groups. Sutures 7-0 were used in the main group, 6-0 were used in the control group. Medial rectus muscle recession has been simulated. Samples were then tested for stretching using universal testing machine INSTRON 3382. The strain value was noted at the first suture breakage point.
Results: In the control group the average maximum strain before the breakage was 8.54Â±1.26 N. In the main group it was 4.38Â±1.05 N (P<0.05), while the maximum strain, which is endured by the muscles in the natural conditions is about 0.24-1.0 N.
Discussion: The sutures 7-0 are twice weaker than sutures 6-0, but this difference is not critical, as the force needed to tear off the muscle attached with the thinner sutures is at least 4 times bigger than the force extraocular muscles can exert in natural conditions.
Conclusion: Characteristics of thin vicryl sutures 7-0 meet the requirements for the surgery of extraocular muscles.
References: Hongmei G., Zhipeng G., Weiyi C. Contractile Force of Human Extraocular Muscle: A Theoretical Analysis.// Appl Bionics and Biomechanics. – 2016