Background: Basketball is one of the most popular and most practiced sports in the world, being played by 450 million people worldwide, and the knee is the most commonly injured region of the body involving adolescent male basketball players. Isokinetic dynamometry is generally considered the best protocol for dynamic strength measurements, which are important for preventing musculoskeletal injuries. Therefore, the objective of the present study was to analyze the muscular performance, the unilateral differences and relationships between the knee extensor and flexor muscles in adolescent male basketball players. Method: The information provided by database concerning the isokinetic evaluation of the knee extensor and flexor muscles from 21 male basketball players under the age of 15 were analyzed. The isokinetic dynamometer was used in a concentric-concentric mode for the knee extensor and flexor muscles at angular velocities of 60°/s, 120°/s, 180°/s, and 240°/s. Results: The results demonstrated no statistically significant differences between the dominant limb and the nondominant limb at the considered velocities, whether for mean peak torque values or for the flexor/extensor ratio. Another important result showed flexor/extensor ratios within normal values for knee joints. Conclusions: This study demonstrated that lower-limb dominance does not interfere in the muscular concentric isokinetic performance of the knee extensor and flexor muscles in adolescent male basketball players. We believe that the short time spent in basketball`s practice (mean time was 2.46 years) appears to be responsible for these results because the adolescent athletes evaluated in this study did not show differences between limbs, in contrast to studies involving older male basketball players.
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