Two things break, and both matter. The anterior talofibular ligament on the outside of the ankle heals back loose, so the joint slides too far ¹. Worse, the tear damages the mechanoreceptors in that ligament, the sensors that track where the foot is, so the muscles that catch a roll fire too slowly ². A loose ankle plus a slow reflex catches the next sprain, which adds more damage. The loop runs until you break it.

The rehab evidence is unusually clean. Balance training reduces sprain recurrence ^{3 4}; a lace-up brace independently cuts it by about half ⁵. In one home program, athletes doing wobble-board work three evenings a week cut next-year recurrence by a third ⁶. Bracing alone matched training; both did best ⁷.

Balance work is the engine; the brace buys time while it rewires. Six weeks is the floor.

Supervised physical therapy adds adherence; the home version still delivers most of the effect ⁶.

What you get back, on three clocks.

• Six to twelve weeks: the giving-way stops and the flinch on stairs goes.
• One year: your recurrent-sprain rate is a third to a half of the untreated path ⁷, and you move measurably more, because instability had quietly suppressed your activity ⁸.
• Twenty years: end-stage ankle arthritis is roughly three-quarters post-traumatic, each giving-way episode shearing off cartilage ^{9 10}. You can't regrow it, but you just bent the rate of loss.

If three to six months of an adherent program still leaves the ankle loose, surgery is the salvage. The Broström-Gould repair re-attaches and reinforces the ligament, with 85 to 95 percent good outcomes at five-to-ten years ¹¹; arthroscopic versions match it with faster recovery ¹². But it restores tightness, not position sense, so the same rehab follows.