Patellar tendon rupture is a tear of the tendon that connects the knee cap (patella) to the tibia. Often there is sudden onset of pain and walking is difficult. In a complete rupture, the ability to extend that knee is decreased. A pop may be felt when it occurs.

Patellar tendon rupture- There are two possible types of rupture: a complete tear and a partial tear. The patellar tendon often ruptures proximally, near the patellar origin. A complete tear leads to a high riding patella and requires surgical repair while a partial tear leads to tendinopathy and can be treated conservatively.