**2.4 Biomechanical testing**

Rabbit knee joints including the tendon-bone tunnel site were collected. To analyze the tensile mechanical properties, tensile strength was measured by a universal testing machine. The specimen was fixed vertically on a 5000 N load-cell, and tensile strength was measured by pulling each specimen at a load displacement rate of 10 mm/min. The failure load and ultimate strength (N) were recorded.
