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Background : Good balance is a pre-requisite for various activities of daily life and sports. Physiotherapists thus regularly assess and train patient’s balance capacities. In order to interpret the test results of unilateral balance tests, a comparison with normative data is common. In patients who had an injury or a surgery, the performance of the injured leg is often compared with performance of the non-injured leg. Nevertheless, it remains unclear if unilateral balance performance differs between the dominant and non- dominant legs. If so, this should take into consideration when interpreting test results. Research question : This meta-analysis summarized the current evidence to determine if the balance performance of healthy adults was influenced by the leg’s dominance. Methods : Articles were searched in PubMed, CINAHL, Cochrane and Embase. Data from studies meeting the pre-defined inclusion criteria were extracted in a standardized form. A meta-analysis was conducted using a random effect model. Results : Forty-six studies were included. Their data were allocated in 7 categories of balance tests. Significant differences between the dominant and the non-dominant legs were not found in any of the categories (surface stable, eyes open: −0.04, 95 % CI −0.12 to 0.05, surface stable eyes closed: −0.06, 95 % CI −0.22 to 0.11, surface unstable, eyes open: −0.15, 95 % CI −0.38 to 0.07, surface unstable, eyes closed: -0.06, 95 % CI −0.27 to 0.15, BESS (Balance Error Scoring System): 0.03, 95 % CI −1.09 to 1.14, SEBT (Star Excursion Balance Test)/YBT (Y Balance Test): 0.06, 95 % CI −0.04 to 0.16, jump: 0.04, 95 % CI −0.28 to 0.36). Significance : Results indicate that balance performance is not influenced by the leg’s dominance. This means that performances of both legs can be used as reference. Evidence is strong for the one leg stance. However, future studies are needed to confirm our results for stabilization tasks after a jump landing.

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