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. 2021 Jul 28;11:15385. doi: 10.1038/s41598-021-94868-0

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Forest plots of knee anterior stability data for single-bundle versus double-bundle reconstruction. Weights are from fixed effects for the Lachman test analysis and random effects for the KT 1000/2000 analysis. (A) Dichotomous data for the Lachman test (6 studies in the baseline period, 476 patients; 3 studies in the 6–12-month period, 170 patients; 3 studies in the 19–24-month period, 251 patients; 1 study in the 25–36-month period, 84 patients and 1 study in the > 36-month period, 87 patients). The heterogeneity was low: χ² = 13.07, df = 13 (P = 0.44); I² = 1% (CI, confidence interval; M-H, Mantel–Haenszel). (B) Continuous data for KT-1000/2000 (8 studies in the baseline period, 654 patients; 4 studies in the 6–12-month period, 150 patients; 1 study in the 19–24-month period, 78 patients; 2 studies in the 25–36-month period, 101 patients and 5 studies in the > 36-month period, 536 patients). Heterogeneity was moderate: τ² = 0.07; χ² = 31.57, df = 19 (P = 0.03); I² = 40% (CI, confidence interval; IV, inverse variance). Data collected from RevMan 5.3 software.