Abstract: A torso orthosis including a chest support securable to a patient. The chest support includes a sternal plate securable in a substantially fixed position with respect to the patient's chest. The chest support also includes a sternal bar and a connection between the sternal plate and the sternal bar. The connection allows the sternal bar to move longitudinally with respect to the sternal plate so that the sternal plate remains in the substantially fixed position with respect to the patient's chest as the patient's torso flexes. The connection can also allow the sternal bar to pivot with respect to the sternal plate as the patient's torso flexes.

Abstract: A pylon includes a first end portion connected to a patient's leg stump and a second end portion connected to a prosthetic foot. The second end portion includes a piston, and the first end portion includes a piston chamber receiving the piston. The second end portion is thus rotatable and axially movable relative to the first end portion about and along a longitudinal axis of the pylon, respectively. The piston chamber encloses a compressible volume of fluid through which substantially all of the patient's weight applied through the patient's leg stump is supported. The compressible volume of fluid is sealed so that it can be pressurized. Also, a torsional spring couples the piston and piston chamber and resists relative rotation between the piston and piston chamber without supporting any substantial portion of the patient's weight applied through the patient's leg stump to the piston.