Please confirm that you are not located inside the Russian Federation
The link you have selected will take you to a third-party website. We do not control or have responsibility for the content of any third-party site.
Enter search terms to find related medical topics, multimedia and more.
Extending the knee involves several structures, which can be injured when people try to straighten their knee and are blocked from doing so. These injuries include
A tear (rupture) in the quadriceps tendon, which attaches the main muscle in the thigh (quadriceps) to the kneecap (patella)
A tear in the patellar tendon, which attaches the kneecap to the shinbone (tibia)
Fracture of the kneecap or top of the shinbone