You review a 15 year old girl with a 3 month history of left knee pain. It is made worse by running and relieved by rest. Her mother is concerned given she is a keen athlete and there has been no obvious trauma. On examination you note tenderness over the left tibial tuberosity.
Given her most likely diagnosis you go on to explain that this condition should settle over weeks or months, but in some people takes up to 2 years to resolve. Roughly in what percentage of patients however do mild symptoms persist into adulthood?