Figure 2From: Cardan angle rotation sequence effects on first-metatarsophalangeal joint kinematics: implications for measuring hallux valgus deformity Illustrates the biaxial joint system located in the first metatarsal. Hallux dorsiflexion and plantar flexion occur about the horizontal-axis in the sagittal plane; abduction and adduction about the vertical-axis in the transverse plane. Dorsiflexion and abduction are the movements displayed with arrows.Back to article page