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Background  Conjunctival autograft transplantation from superior conjunctiva is often chosen to lower the postoperative recurrence rate for pterygium treatment. However, inferior conjunctival autograft (ICA) might be taken as an alternative surgery method, especially under certain conditions. Consequently, we designed this research to estimate and contrast the result of inferior conjunctival autograft and superior conjunctival autograft (SCA) on the postoperative recurrence rate.    Methods  We searched through network database (PubMed, Embase and Cochrane Central Register of Controlled Trials) to choose suitable randomized controlled trials (RCTs). Based on Cochrane review methods, we evaluated eligibility and risk of bias of included studies. The primary measures included postoperative recurrence rate. Pooled risk ratios (RRs) and 95% confidence intervals (CIs) were assessed. RevMan 5.3 software was utilized to conduct statistical analysis.    Results  Four RCTs composed of a total of 438 eyes were included in this meta-analysis, with 234 eyes in the inferior conjunctival autograft group and 204 eyes in the superior conjunctival autograft group. Statistical meta-analysis revealed that the postoperative recurrence rate was similar between the two groups (RR = 0.77, 95% CI: 0.36 to 1.62,  P  = 0.49). Only two RCTs applied the postoperative pain scale and one of them did not provided adequate numbers.    Conclusions  Our meta-analysis indicated that inferior autograft transplantation and superior autograft transplantation had a similar effect on postoperative recurrence rate. The inferior autograft group might have a less postoperative pain. Subsequent RCTs which have more patients participated and more outcomes are needed to confirm our conclusions in years to come.    Supplementary Information  The online version contains supplementary material available at 10.1186/s12886-021-01889-4.

bmc ophthalmology

Recurrence rate with inferior conjunctival autograft transplantation compared with superior conjunctival autograft transplantation in pterygium surgery: a meta-analysis