Funding for this research was provided by:
National Science Foundation of China NSFC (81871787)
Received: 22 September 2020
Accepted: 15 December 2020
First Online: 5 February 2021
Ethics approval and consent to participate
: This study was approved by the institutional review board of the First Affiliated Hospital of Sun Yat-Sen University (No. 161]). Written informed consent was obtained from each patient.
: Written informed consent was obtained from each patient for the publication of this study.
: The authors declare that they have no competing interests.Additional file InternalRef removed: Figure S1. Design of functional free gracilis muscle transfer. The gracilis muscle is completely harvested from the origin on the pubic ramus to the pes anserine tendon around the interior knee joint.