The patella moves up and down, tilts and rotates the knee ligaments. The knee ligament connects the scapula to the tibia. Tendons made of rigid bands like ropes are very strong. It helps the hamstrings straighten your legs when kicking the ball. pedal pedal bike jumping up Patella tendonitis is an injury to this tendon. Often called jumper's knee because it is common in athletic athletes. With jumping, running, stopping and starting (basketball, football, volleyball), however everyone can have it.