Symptoms. Rupture of either the quadriceps or patellar tendon causes pain (especially when you try to kick or straighten your knee). If you have a complete rupture, you can't straighten your knee.

Patellar tendonitis: Also known as jumper's knee ... Overuse, muscle imbalances, or improper footwear often cause this pain. It is common in runners but can affect anyone engaging in activities ...

Patellar tendonitis affects the tendon connecting ... The lining of the bursa thickens, producing extra fluid, which causes the bursa to swell. It can be caused by infection, or the inflammation ...

Wear and tear from daily activities and injuries are some of the most common causes of knee pain, but long-term knee pain can indicate an underlying health issue. Here, we group the most common ...

Triston Casas suffered the injury when he beat a throw to first in Friday's game, getting stretchered off the field afterward ...

Here's what can cause knee weakness and how to make weak knees ... Inflammation is another major factor "which is most commonly caused by tendonitis," says Dr. J. Ryan Taylor, a sports medicine ...