Fig. 1

Inside-out meniscus repair procedure and biomechanical experiment methods. a A vertical suture initiated 3 mm from the inner edge of the meniscal lesion and meniscus was repaired within each 1.5-mm distance from the lesion. b Two points 1.5 mm away from the meniscal repair (points α and β) were marked and used to measure the distance after cyclic loading. c Biomechanical testing was conducted on a material testing machine and recorded with a video camera for analysis