['Determine the relationship between unilateral lower extremity closed kinetic chain muscle performance and unilateral frontal plane landing kinematics.', 'Descriptive.', 'Outpatient physical therapy clinic.', 'Twenty adolescent female athletes.', 'Unilateral lower extremity muscle performance was quantified at 25° of knee flexion on a computerized leg press. Unilateral frontal plane tibiofemoral kinematics were captured with a bi-axial electrogoniometer during a drop jump maneuver from a 40\xa0cm platform.', 'Peak and average force and force normalized to body weight were not significantly related to frontal plane landing kinematics. Time to peak force however was related to both frontal plane initial contact (r\xa0=\xa0-0.54; P\xa0=\xa00.013) and peak angles at 100\xa0ms post-contact (r\xa0=\xa0-0.53; P\xa0=\xa00.016). As time to peak force increased, tibiofemoral angles were in greater amounts of valgus.'] Is time to peak force related to frontal plane landing kinematics in female athletes?