<unk>  is a medical term referring to a common<unk>  for surgical procedures involving the pelvis and lower abdomen. The majority of colorectal and pelvic surgery is conducted with the patient in the<unk> . It was popularised for these procedures by Oswald<unk><unk>  working at St Marks Hospital London.<unk>  It is derived from the Trendelenburg<unk>  but with the legs abducted to allow access to the perineum. The basic angle is a 30-degree Trendelenburg with the hips flexed at 15 degrees; this can be adjusted with leg supports.
Lloyd-Davies position
Sims' position
Tripod position
Lithotomy position
Wood's screw maneuver
Knee-chest position
Fowler's position
Ashby technique