Occasionally other conditions can be associated with patellar tendonitis including diabetes, gout, para-hypothyroidism. Other conditions which can be a cause of anterior knee pain are commonly confused with patellar tendonitis. These conditions include, synovial plicae, chondromalacia, quadriceps tendonitis, patello-femoral subluxation and hyper-pressure, fat pad impingement or Hoffa's syndrome and patello-femoral arthritis.