What is patellar tendonitis caused by?

Usually Jumping. Overuse of your patellar tendon especially by jumping [aka jumper's knee]. The patellar tendon is the large tendon between your kneecap and your leg or shin bone. It is about three finger breadths long. Patellar tendonitis, or inflammation of the tendon, will be painful to firm touching. It is not pain behind the kneecap, or pain at the joint lines, or pain of the tibial turbercle.

Related Questions

What is patellar tendonitis, and what causes it?

Inflammation. It is an inflammation of the ligament(mislabeled a tendon) from the kneecap(patella) to the leg bone(tibia). It is associated with running activities, most commonly jumping i.e. Basketball. Read more...

Being a dancer, I have slowly and gradually built up my extreme flexibility. Could these instense stretches be what caused my patellar-tendonitis?

Possible. Hypermobility (being very flexible) can lead to poor tracking of the knee cap (patella) in the groove on the femur (leg bone) which can lead do patellar-tendonitis. Quadriceps strengthening exercises can help as can an elastic knee brace with a whole for the kneecap which can improve tracking. Exercises for iliotibial band (it band) syndrome can also help. Read more...
Tendonitis. It is probably not the streches. It is more like the extreme activity of dancing leaping and jumping placing your muscles and tendons at high stress that resulted in the patellar-tendonitis. The stretching is probably protective to you. See your doctor for specific treatment for the tendonitis. Read more...

What causes patellar tendinitis?

Inflammation. Inflammation of the patella due to overuse or repetitive motion. Overuse injuries respond best with rest, ice and nsaids. Therapy helps with decreasing swelling and pain as well as improving strength and range of motion. Recurring tendinitis could be occurring due to needing to improve running form or perhaps needing orthotics. Read more...