Fig. 1From: Concurrent validity of lower extremity kinematics and jump characteristics captured in pre-school children by a markerless 3D motion capture systemFrontal Plane Measures.Note: Hip, knee, and ankle joint center positions projected onto the frontal plane. Frontal Plane Projection Angle (FPPA), Frontal Plane Knee Angle (FPKA) and Frontal Plane Knee Deviation (FPKD) are calculated based on these projected joint center positions. The shown positions of the joint centers represent the medial deviation of both knees during a squatBack to article page