An ankle module removably coupleable to a proximal portion of a prosthetic foot comprising: a base portion coupleable to the proximal portion so that a planar surface of the base portion contacts a surface of the proximal portion of the prosthetic foot; an adapter portion pivotally coupled to the base portion and having a coupling member configured to removably couple the prosthetic foot to a prosthetic pylon or socket; and an actuator, characterized in that: one of the base and adapter portions (410, 220) having four cylinders (224a-d) formed therein and aligned symmetrically relative to a pivot axis of the ankle module, the four cylinders (224a-d) housing corresponding pistons slidably displaceable within the cylinders, wherein two of the four cylinders are proximal cylinders (224c-d) and two of the four cylinders are distal cylinders (224a-b) positioned vertically lower than the proximal cylinders (224c-d), and wherein the proximal cylinders (224c-d) are in fluid communication with each other and the distal cylinders (224a-b) are in fluid communication with each other, the actuator is selectively actuatable to place the proximal cylinders (224c-d) in fluid communication with the distal cylinders (224a-b), allowing a hydraulic fluid to flow between the proximal and distal cylinders (224a-d) as an angular position of the adapter portion is adjusted relative to the base portion, and the actuator is selectively actuatable to fluidly isolate the proximal cylinders from the distal cylinders (224a-b) so that the angular position of the adapter portion relative to the base portion remains substantially fixed, thereby adjusting the dorsi-plantar position between the adapter portion and the base portion of the ankle module. a base portion coupleable to the proximal portion so that a planar surface of the base portion contacts a surface of the proximal portion of the prosthetic foot; an adapter portion pivotally coupled to the base portion and having a coupling member configured to removably couple the prosthetic foot to a prosthetic pylon or socket; and an actuator, characterized in that: one of the base and adapter portions (410, 220) having four cylinders (224a-d) formed therein and aligned symmetrically relative to a pivot axis of the ankle module, the four cylinders (224a-d) housing corresponding pistons slidably displaceable within the cylinders, wherein two of the four cylinders are proximal cylinders (224c-d) and two of the four cylinders are distal cylinders (224a-b) positioned vertically lower than the proximal cylinders (224c-d), and wherein the proximal cylinders (224c-d) are in fluid communication with each other and the distal cylinders (224a-b) are in fluid communication with each other, the actuator is selectively actuatable to place the proximal cylinders (224c-d) in fluid communication with the distal cylinders (224a-b), allowing a hydraulic fluid to flow between the proximal and distal cylinders (224a-d) as an angular position of the adapter portion is adjusted relative to the base portion, and the actuator is selectively actuatable to fluidly isolate the proximal cylinders from the distal cylinders (224a-b) so that the angular position of the adapter portion relative to the base portion remains substantially fixed, thereby adjusting the dorsi-plantar position between the adapter portion and the base portion of the ankle module. one of the base and adapter portions (410, 220) having four cylinders (224a-d) formed therein and aligned symmetrically relative to a pivot axis of the ankle module, the four cylinders (224a-d) housing corresponding pistons slidably displaceable within the cylinders, wherein two of the four cylinders are proximal cylinders (224c-d) and two of the four cylinders are distal cylinders (224a-b) positioned vertically lower than the proximal cylinders (224c-d), and wherein the proximal cylinders (224c-d) are in fluid communication with each other and the distal cylinders (224a-b) are in fluid communication with each other, the actuator is selectively actuatable to place the proximal cylinders (224c-d) in fluid communication with the distal cylinders (224a-b), allowing a hydraulic fluid to flow between the proximal and distal cylinders (224a-d) as an angular position of the adapter portion is adjusted relative to the base portion, and the actuator is selectively actuatable to fluidly isolate the proximal cylinders from the distal cylinders (224a-b) so that the angular position of the adapter portion relative to the base portion remains substantially fixed, thereby adjusting the dorsi-plantar position between the adapter portion and the base portion of the ankle module.