The knee has the most complex structure of the human body. It supports for movement.
The knee has the most complex and unstable structure of the human body.
In addition, it functions as a support point for movement in various sports activities, and it is a site that is liable to be stressed and to be damaged.
Anatomy of Knee
Sports Injury of Knee
Jumper's knee (also known as Patellar tendinitis)
Tear of anterior cruciate ligament（ACL）