What will help patellar tendonitis?

Quad strengthening: The biggest thing is working on quadriceps strengthening. The most important is straight leg rasing. The other part of exercise is to avoid deep flexion of the knees, any squats or leg presses should be done only to about 60 degrees of bending. Also, add hamstring stretching. Another helpful tactic can be icing 20 minutes 3-4x per day. If you can take alleve/motrin can be helpful.