quadriceps tendon rupture. knee injury. sports injury. knee pain. front view. labeled medically

quadriceps tendon rupture knee injury tear extension pain swelling surgery rehabilitation trauma tendonitis weakness recovery instability ligament muscles diagnosis mri treatment repair chronic acute bracing immobilization stiffness exercise physical therapy overuse strengthening flexion strain sports jumping running stretching support function movement inflammation torn healing stability tendinopathy shock balance flexibility mobility rupture injury pain front view labeled medically painful tears causing loss leg needing