What is the best treatment for quad tendinitis?

Rest, meds, PT, u/s: Tendinitis in the limbs is often result of over use/trauma and the first thing to do is take it easy/rest a bit. Antiinflammatory meds such as aleve/motrin may help. Physical therapy/gentle stretching/rom exercises. Iontophoresis ultrasounds therapy, topical meds etc...May help quite a bit as well. So, if doing on your own not enough, consult doc. Good luck.