Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs Patellar tendinitisUpdated: 2019-10-16OverviewPatellar tendinitis is an injury of the tissue connecting the kneecap to the shinbone (patellar tendon). The patellar tendon helps the muscles extend the knee.SymptomsPatellar tendinitis is an injury of the tissue connecting the kneecap to the shinbone (patellar tendon). The patellar tendon helps the muscles extend the knee.TreatmentsTreatment usually begins with physical therapy. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use