The Indirect Role of Gluteus Medius Muscle in Knee Joint Stability during Unilateral Vertical Jump and Landing on Unstable Surface in Young Trained Males

(1) In the present investigation, we tested hypothesis that unilateral countermovement jump performance is associated with knee joint stabilization ability during landing on unstable surface. (2) Twenty-five male sport students were for dynamometric extension and flexion, hip abduction isometric strength. Myolectric activity of vastus lateralis medialis, gluteus medius, biceps femoris muscles measured vertical performed a force plate, (3) Vertical impulse negatively correlated activation at landing. Participants greater impulse, activated less when Furthermore, participants smaller flexion/extension torque ratio increased femoris/vastus medialis (4) We conclude strength an important contributor to performance. Because considered synergist anterior cruciate ligament, also propose abductors are primary frontal plane protectors by reducing valgus stress, allowing co-activation (secondary protection)