During a single-leg squat, the knee moves medially past the great toe with contralateral pelvic drop. This observation MOST suggests impairment of:

• 1 Quadriceps eccentric capacity limiting the depth achieved during the squat movement
• 2 Passive hip flexion range restricting the amount of forward trunk lean available
• 3 Hip abductor and external rotator control ✓ 정답
• 4 Ankle plantar flexor strength measured through repeated single-limb heel raises

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