As mentioned above, ACL augmentation may has potential clinical advantages including better knee stability, mechanical strength and proprioceptive function, yet evidence of the earlier effect of this technique is still lacking, with joint position sense was demonstrated by one study only. With the relatively new technique's popularity and potential benefit on proprioception, it deserves more research on studying the difference in both the clinical and proprioception outcome from reconstruction. Therefore, a comparative study on the difference in knee proprioception and postural stability between ACL augmentation and reconstruction, including early post-operative assessment is performed.