The most common symptom of quadriceps tendinitis is anterior knee pain, which affects the front of the knee, just above the kneecap. Usually, the pain is dull and gradually increases over time.

latrobe.edu.au Background Quadriceps strengthening exercises are part of the treatment of patellofemoral pain (PFP), but the heavy resistance exercises may aggravate knee pain. Blood flow restriction ...

Suddenly, you feel a pop in your knee, then immediate pain followed ... Work on overall leg strength, including your quadriceps, hamstrings and glutes.