Purpose: To compare the outcome of Muller's muscle conjunctival resection (MMCR) versus external levator advancement (ELA) in patients undergoing ptosis surgery.
Methods: A systematic review and meta-analysis were performed as per the Preferred Reporting Items for Systematic Reviews and Meta-analyses guidelines, and a search of electronic information was conducted to identify all comparative studies of MMCR versus ELA in ptosis repair. The primary outcome measures were the post-operative marginal reflex distance (MRD1), ptosis under-correction, over-correction, and re-operation rate. Secondary outcome measures included cosmetic appearance, complications, operative time, and learning curve. Fixed-effect modelling was used for the analysis.
Results: Seven studies that enrolled 1038 eyelids were identified in the literature. There was no statistically significant difference between the MMCR and ELA groups in post-operative MRD1 (Mean Difference [MD] = 0.13, P = 0.28) and the rate of under-correction odds ratio [OR] = 0.49, P = 0.14). However, ELA had a significantly higher rate of over-correction (OR = 0.17, P = 0.04) and re-operations (OR = 0.26, P = 0.0001) compared to MMCR. For secondary outcomes, MMCR had an improved cosmetic appearance, lower total number of complications and shorter operation time (MD = - 10.96, P < 0.00001). Finally, the two techniques had no significant difference in the learning curves.
Conclusion: Both MMCR and ELA are effective techniques for the surgical correction of ptosis; however, MMCR surgery is a more predictable and robust technique compared to, ELA with lower rates of over-correction and re-operation.
Keywords: External levator advancement; Muller's muscle conjunctival resection; Ptosis.
© 2023. The Author(s), under exclusive licence to Springer Nature B.V.