dorsal recumbent position A position in which the patient lies on the back with the lower extremities moderately flexed and rotated outward. It is employed in the application of obstetrical forceps, repair of lesions following parturition, vaginal examination, and bimanual palpation.
knee-chest position the patient rests on the knees and chest with head is turned to one side, arms extended on the bed, and elbows flexed and resting so that they partially bear the patient's weight; the abdomen remains unsupported, though a small pillow may be placed under the chest. See illustration.
Background Previous trials involving patients with the acute respiratory distress syndrome (ARDS) have failed to show a beneficial effect of prone positioning during mechanical ventilatory support on outcomes. We evaluated the effect of early application of prone positioning on outcomes in patients with severe ARDS.
The Sims' position, named after the gynaecologist James Marion Sims, is usually used for rectal examination, treatments and enemas. It is performed by having a patient lie on their left side, left hip and lower extremity straight, and right hip and knee bent.