Arthroscopic reconstruction of anterior cruciate ligaments with allograft: single-tunnel single-bundle versus single-tunnel double-bundle techniques.

"Declarations Ethics approval and consent to participateThis study was approved by the Ethical Committee of the First Affiliated Hospital of Shenzhen University, Shenzhen Second People’s Hospital. Written informed consent was obtained from the patients for the publication of this study and any accompanying images. Consent for publicationConsent to publish was obtained from all the participants. Competing interestsThe authors declare that they have no conflict of interest. Competing interests The authors declare that they have no conflict of interest."

"Funding This research was funded by the National Natural Science Foundation of China (81902303, 81902682, 81672234), the Guangdong Basic and Applied Basic Research Foundation (2021A1515220030, 2021A1515011122, 2020A151501048), the Shenzhen Double Chain Project for Innovation and Development Industry supported by the Bureau of Industry and Information Technology of Shenzhen (201806081524201510), the Shenzhen Science and Technology Project (RCYX20210609103902019, RCBS20200714114856299, JCYJ20190806164216661, GJHZ20180416164801042, JCYJ20180305124912336), the Science and Technology Commission of Shanghai Municipality (Shanghai Sailing Program 19YF1408900), and the Clinical Research Project of Shenzhen Second People’s Hospital (20173357201814, 20203357028, 20203357007)."