Assessing Balance in Young Athletes With and Without Chronic Ankle Instability.

Only 30 athletes took part, 10 per group, all recruited by convenience from taekwondo and badminton schools in one Thai city. At this size, small differences between the children could easily create or hide a group difference, and the authors themselves note that a larger sample would give more statistical power. Balance was measured on one day only, so the study cannot show whether balance deficits come before chronic instability or after it, or whether they predict future injury. The groups were not tested identically: athletes with a history of ankle sprain were tested on the injured leg, while healthy athletes were tested on their dominant leg. No muscle activity recordings or movement analysis were collected, so the reasons for the balance differences were not tested. The authors also list the single-centre, cross-sectional design and the small sample as limits on how far the results generalise.

The authors declare no conflict of interest. The text provided states no funding source and says nothing about a sponsor taking part in the design, analysis or writing.

Do not read the conclusion as evidence that balance or proprioceptive training works in these athletes. The study tested no treatment: it measured balance once in 30 young athletes, so it can only show that the group with chronic ankle instability was worse on the day. It also cannot be read as showing the groups differ in all balance conditions, because with eyes closed there was no difference between them.