What anterior reach difference on the Star Excursion Balance Test places an individual at increased risk for injury?

What anterior reach difference on the Star Excursion Balance Test places an individual at increased risk for injury?

• A. anterior reach difference >3 cm
• B. anterior reach difference >5 cm
• C. anterior reach difference >4 cm
• D. anterior reach difference >2 cm

Answer: (C)

The main idea is that asymmetry in dynamic balance performance—specifically, how far you can reach anteriorly on one leg compared with the other—reflects neuromuscular control deficits that raise knee injury risk. In the Star Excursion Balance Test, a difference in anterior reach distance between limbs that is greater than about 4 cm signifies a meaningful imbalance in hip, core, and knee stability during a challenging single-leg task. This level of asymmetry has been linked to an increased risk of knee injuries such as ACL tears and patellofemoral pain in athletes, so it’s used as a screening threshold. Why this threshold fits best: a 4 cm cutoff balances sensitivity and specificity—smaller differences (for example, 2 or 3 cm) might flag too many healthy individuals, while larger differences (like 5 cm or more) could miss athletes who are still at elevated risk. Thus, the >4 cm anterior reach difference is the commonly cited marker for increased injury risk. If you notice a difference exceeding this threshold, it’s often followed by targeted neuromuscular training focusing on dynamic balance, hip and trunk stability, and movement mechanics to reduce injury risk.

The main idea is that asymmetry in dynamic balance performance—specifically, how far you can reach anteriorly on one leg compared with the other—reflects neuromuscular control deficits that raise knee injury risk. In the Star Excursion Balance Test, a difference in anterior reach distance between limbs that is greater than about 4 cm signifies a meaningful imbalance in hip, core, and knee stability during a challenging single-leg task. This level of asymmetry has been linked to an increased risk of knee injuries such as ACL tears and patellofemoral pain in athletes, so it’s used as a screening threshold.

Why this threshold fits best: a 4 cm cutoff balances sensitivity and specificity—smaller differences (for example, 2 or 3 cm) might flag too many healthy individuals, while larger differences (like 5 cm or more) could miss athletes who are still at elevated risk. Thus, the >4 cm anterior reach difference is the commonly cited marker for increased injury risk.

If you notice a difference exceeding this threshold, it’s often followed by targeted neuromuscular training focusing on dynamic balance, hip and trunk stability, and movement mechanics to reduce injury risk.