A positioning frame for supporting a patient, the positioning frame comprising: at least one main beam having a first end, a second end, and a length extending between the first and second ends, the at least one main beam defining an axis of rotation relative to at least a first support structure and a second support structure, the at least one main beam being rotatable about the axis of rotation between at least a first position and a second position, the axis of rotation substantially corresponding to a cranial-caudal axis of the patient when the patient is supported on the positioning frame; the first and second support structures supporting the at least one main beam, the first and second support structure spacing the at least one main beam from the ground; a torso-lift support attached to the at least one main beam, the torso-lift support including a chest support plate being configured to support the chest of the patient, the torso-lift support being pivotally connected to the at least one main beam, the torso-lift support being configured to pivot the chest support plate between at least a first position and a second position to move the torso of the patient between an unlifted position and a lifted position; and a pelvic-tilt support attached to the at least one main beam, the pelvic-tilt support including a thigh cradle and a lower leg cradle, the thigh cradle being configured to support the thighs of the patient, and the lower leg cradle being configured to support the lower legs of the patient, the thigh cradle and the lower leg cradle being pivotal with respect to one another to facilitate adjustment of the hips of the patient, characterised in that the torso-lift support includes a four bar mechanism attached to the chest support plate, the four bar mechanism including first links pivotally connected between the main beam and the chest support plate, and second links pivotally connected between the main beam and the chest support plate. at least one main beam having a first end, a second end, and a length extending between the first and second ends, the at least one main beam defining an axis of rotation relative to at least a first support structure and a second support structure, the at least one main beam being rotatable about the axis of rotation between at least a first position and a second position, the axis of rotation substantially corresponding to a cranial-caudal axis of the patient when the patient is supported on the positioning frame; the first and second support structures supporting the at least one main beam, the first and second support structure spacing the at least one main beam from the ground; a torso-lift support attached to the at least one main beam, the torso-lift support including a chest support plate being configured to support the chest of the patient, the torso-lift support being pivotally connected to the at least one main beam, the torso-lift support being configured to pivot the chest support plate between at least a first position and a second position to move the torso of the patient between an unlifted position and a lifted position; and a pelvic-tilt support attached to the at least one main beam, the pelvic-tilt support including a thigh cradle and a lower leg cradle, the thigh cradle being configured to support the thighs of the patient, and the lower leg cradle being configured to support the lower legs of the patient, the thigh cradle and the lower leg cradle being pivotal with respect to one another to facilitate adjustment of the hips of the patient, characterised in that the torso-lift support includes a four bar mechanism attached to the chest support plate, the four bar mechanism including first links pivotally connected between the main beam and the chest support plate, and second links pivotally connected between the main beam and the chest support plate.