Runners Knee: There are two kinds, which do you have? Jan 05, 2019 · 2018 — Added a short section about causes, continuing to work on making the page more of a useful on-stop resource. 2018 — Added more basic information about ITBS and PFPS to the introduction, hopefully boosting the usefulness of the page. 2016 — Significant revision. The article now gets to the point quicker, and is less wordy overall.