Persistent pain along the outside of the ankle, behind the fibula, that flares with running, hiking on uneven ground, or simply walking on a cambered street, does not always behave the way "tendinopathy" is described in generic handouts.

If you're dealing with a nagging, deep ache at the back-outer corner of your ankle that flares with pointed-toe positions, downhill running, or pushing off hard, you've probably already heard the standard advice: rest, ice, maybe a cortisone injection, maybe surgery if it doesn't settle.