Foreign body suture granuloma in canthal surgery: association with suture type

PurposeForeign body suture reaction ("suture granuloma") is a complication faced by all surgeons. The purpose of this study was to examine the incidence and risk factors of suture granulomas in canthal surgery.MethodsAn IRB-approved retrospective review of medical records identified patients who had canthal surgery. Statistical analysis was performed on multiple data points to determine associations with granuloma formation. Summary statistics were reported as a mean and standard deviation for continuous variables, and as frequencies or proportions for categorical variables. Effect estimates were reported as odds ratios. A p-value of less than .05 was deemed statistically significant.ResultsA total of 758 procedures were included. Seven commonly used suture materials were encountered including uncoated polyester, polyester coated with polytetramethylene adipate (PTMA), nylon, polydioxanone, polyester coated with polytetrafluoroethylene (PTFE), polypropylene, and polyglactin 910. Eighteen total granulomas were observed (2.4%). Fifteen granulomas were associated with uncoated polyester, two with polyester coated with PTFE, and one with polypropylene. The odds of developing a suture granuloma with uncoated polyester were 25.4 times as likely as polyglactin 910 (p = .04). The odds of developing a suture granuloma with a non-absorbable, braided suture were 23.2 times as likely as absorbable, braided suture (p = .04). There was no significant association identified between the other collected variables.ConclusionsForeign body suture granulomas occur at a low rate following canthal surgery and can be largely avoided through careful selection of resorbable or monofilament sutures.