what plane does knee flexion occur in
Legs together and knee straight; Toes pointing straight forwards; Arms by the side; Palms facing forwards; Movements. Flexion and Extension . Flexion is a movement in the sagittal plane, which decreases the angle at the moving joint. Extension is the opposite movement, which increases the angle at the joint. Many types of synovial joint are capable of flexion and extension (hinge; ball and socket; saddle; condyloid) including the shoulder, elbow, wrist, hip and knee.