An 11-year-old in her third season of competitive gymnastics, training nine hours a week, has quietly stopped putting her hand up for vault and tumbling — the two things she was best at — and now volunteers for beam. She limps for the first ten minutes after every session and has twice asked her father to carry her to the car. It has been six weeks, gradually worse, with no single day it started, no landing she remembers going wrong, no fall, no twist and no blow. Her father brought her because the club coach told him to get it looked at before the regional qualifiers. She is well and chatty and keen to say she can still train, describing it as "only after" — which turns out to be the important word.