The plantar flexion prevention device is an elastic sock. The sock extends over a foot to a calf area above the foot. A heel portion has a first attachment mechanism positioned near a plantar surface of a heel of the foot. There is an inverted Y-shaped inelastic strap that has two members securely attached to the elastic sock near the plantar surface of a metatarsalphalangeal joint region of the foot. A third member has a second attachment mechanism positioned in a middle portion of the third member. There is an inelastic toe strap that extends from a toe portion of the sock. A separate adjustable cuff with a third attachment mechanism is positioned above the calf area of the leg. The inelastic toe strap attaches to the second attachment mechanism of the inverted Y-shaped strap for toe extension, and can attach to the first attachment mechanism for toe flexion.
