The dorsal lithotomy position is a way of positioning a patient on their back with the hips flexed and legs raised, spread apart, and supported by stirrups or leg holders attached to the operating table. It is one of the most commonly used surgical positions in gynecology, urology, and colorectal surgery because it gives the medical team a direct line of access to the pelvic and perineal regions. The position looks straightforward, but the physiology behind it and the complications it can cause are more involved than many patients realize.
How the Position Actually Looks
A person in dorsal lithotomy lies flat on their back (the “dorsal” and “supine” part) on a specially designed table. The legs are lifted, spread outward roughly 30 to 45 degrees from the midline, and the hips and knees are typically bent to about 90 degrees. Stirrups or boot-style leg holders cradle the lower legs or feet to keep them in place for the duration of the procedure. The bottom edge of the table is often removed or dropped down so the surgeon can work directly between the patient’s legs. In practice, the exact angles vary depending on the surgery. A routine pelvic exam uses a mild version with the feet in simple heel stirrups and only moderate hip flexion. A complex rectal or urologic surgery may use a steeper “high lithotomy” variant where the legs are elevated more aggressively and the hips are flexed further.
Where It Is Used
The position exists because it exposes anatomy that is otherwise difficult to reach. Gynecologic exams, Pap smears, vaginal ultrasounds, and childbirth are the everyday uses most people encounter. On the surgical side, it is the go-to setup for procedures on the urethra, bladder, prostate, rectum, and colon, as well as for tumor removal in the pelvic region.1Osmosis. Lithotomy Position · What Is It and It Uses Robotic-assisted surgeries on the prostate or uterus frequently combine lithotomy with a steep head-down tilt (Trendelenburg position) so the abdominal organs shift away from the pelvis and the surgeon’s robotic instruments have more room to work.2PubMed Central. Quantitative rise in intraocular pressure in patients undergoing robotic surgery in steep Trendelenburg position
Even procedures that might not seem pelvic at first glance sometimes call for lithotomy. Certain approaches to penile prosthesis implantation, for example, use a low lithotomy variant to give the surgeon comfortable access to both the perineal and scrotal regions while maintaining stable ergonomic control.3The Journal of Sexual Medicine. Inflatable Penil Prosthesis Implantation in Low Lithotomy Position The common thread is any operation where the surgeon needs to see and reach structures tucked between the legs.
A Name That Goes Back to Antiquity
“Lithotomy” literally means cutting for stone, referring to the surgical removal of bladder stones. The position was developed because bladder stone extraction required the patient’s perineum to face the surgeon. Historical evidence traces the technique back at least to the Roman physician Celsus in the first century AD and the Byzantine surgeon Paul of Aegina in the seventh century, with the basic approach passed down largely unchanged for hundreds of years.4PubMed. Lithotomy by empirical doctors in the 19th century: a traditional surgical technique that lasted through the centuries The position long outlived bladder stone surgery as a primary concern; today it is used for dozens of procedures that have nothing to do with stones, but the old name stuck.
Why the Position Creates Risk
Raising someone’s legs above their heart for hours is not physiologically neutral. Two broad categories of harm can result: nerve injuries and vascular problems.
When the legs rest in stirrups, external pressure on the outer side of the knee can compress the common peroneal nerve, which wraps around the head of the fibula just below the knee. This compression is the main cause of “foot drop” after lithotomy surgery, where the patient wakes up unable to lift the front of their foot properly. Research on knee-crutch leg-holder systems has shown that the pressure against the fibular head region is higher in men than women, and increases with greater body weight and BMI.5PubMed Central. Factors that increase external pressure to the fibular head region, but not medial region, during use of a knee-crutch/leg-holder system in the lithotomy position Heavier patients, in other words, face more nerve compression from the very same equipment.
The vascular concern is even more serious. Elevating the legs reduces blood flow to the lower limbs while the leg holders press against the calf muscles from the outside. Over time, the muscle compartments in the lower leg can become starved of oxygen. If the legs are then lowered and blood rushes back in, the resulting reperfusion can trigger swelling inside the tight muscular compartments, a condition called well leg compartment syndrome (WLCS). WLCS is rare, but when it happens it can destroy muscle tissue and, in extreme cases, lead to amputation or kidney failure from the breakdown products.6PubMed Central. Well Leg Compartment Syndrome: Pathophysiology, Prevention, and Treatment The condition is recognized after urologic, colorectal, and gynecologic procedures.7PubMed Central. Well leg compartment syndrome after pelvic and perineal surgery in the lithotomy position
Operative Time Is the Biggest Risk Factor
Almost every complication of lithotomy gets worse the longer the patient stays in the position. For routine endoscopic urologic or simple gynecologic procedures performed in under an hour, the risks are low. But the rise of major robotic-assisted surgery has pushed lithotomy times well beyond three or four hours when you add up docking the robot, achieving the surgical pneumoperitoneum, the operation itself, and undocking.8PubMed Central. Patient positioning during minimally invasive surgery: what is current best practice? One case report described WLCS developing after an ileoanal pouch procedure during which the patient remained in high lithotomy with a head-down tilt for over four hours.9International Journal of Surgery Case Reports. Well leg compartment syndrome after surgery for ulcerative colitis in the lithotomy position
Adding a Trendelenburg tilt makes things worse for the legs. As the head-down angle increases, blood pressure in the lower legs drops further while external pressure from the calf supports actually goes up. Measurements at various tilt angles showed calf contact pressures climbing steadily from roughly 39 mmHg at zero degrees to about 50 mmHg at 20 degrees of tilt.10PubMed. Lower leg blood pressure decreases while calf external pressure increases with the angulation of the Trendelenburg position in the lithotomy position with calf- and foot-supported leg holders That combination of falling perfusion and rising compression is what sets up compartment syndrome.
What the Position Does to Breathing
Even for patients whose legs come through fine, lithotomy affects the chest. Flexing the hips pushes the abdominal contents upward against the diaphragm, especially in the more extreme “exaggerated lithotomy” posture used for radical perineal prostatectomy. A study of patients in that position under general anesthesia found that lung compliance dropped by roughly a quarter to a third, while airway pressures rose by a third or more.11PubMed. The effects of the exaggerated lithotomy position for radical perineal prostatectomy on respiratory mechanics These shifts are manageable for a healthy person on a ventilator, but they demand careful monitoring from the anesthesia team, and they can become dangerous in patients with pre-existing lung disease or obesity.
Stirrup Type Matters More Than You Might Think
Not all stirrups carry the same risk. The two major types in gynecologic surgery are “candy cane” stirrups, which are simple metal poles with ankle loops, and “boot” stirrups, which cradle the entire lower leg in a padded trough. A large retrospective study comparing the two found that nerve injuries in the legs occurred in about 3.4 percent of patients using candy cane stirrups versus about 1.6 percent with boot stirrups. After adjusting for other factors, candy cane stirrups nearly tripled the odds of postoperative neuropathy, and each additional hour of surgery also raised the risk independently.12PubMed Central. Post-Operative Lower Extremity Neuropathy With Boot Stirrups Compared With Candy Cane Stirrups The likely reason is that candy cane stirrups concentrate pressure on a narrow band around the ankle or calf, while boot stirrups distribute the load more evenly.
This is a case where equipment choice directly translates into patient outcomes. If you’re heading into a procedure that will be done in lithotomy, it is reasonable to ask what type of leg support your surgical team uses.
The Childbirth Debate
Lithotomy became the default delivery position in Western obstetrics for reasons that had as much to do with physician convenience as with physiology. The position gives the birth attendant an excellent view and easy access to perform episiotomies or instrumental deliveries. But research comparing it to upright alternatives has consistently found trade-offs that favor letting the laboring person move.
Compared to lying on their back, people who labor in upright positions such as squatting, kneeling, or sitting on a birth stool tend to have a shorter second stage of labor. Gravity helps the baby descend, and the pelvic outlet physically widens in upright postures, reducing the chance of obstructed labor. The need for episiotomies and assisted deliveries also drops.13PubMed Central. Alternative Birthing Positions Compared to the Conventional Position in the Second Stage of Labor: A Review None of this means lithotomy is never appropriate during delivery. Certain complications, epidural anesthesia that limits mobility, and the need for continuous fetal monitoring can all make the supine position the most practical choice. But the evidence is clear enough that many hospitals and midwifery practices now actively encourage alternative positions for uncomplicated births.
Recovery from Lithotomy-Related Nerve Injuries
The good news about peroneal nerve injuries and other lower-extremity neuropathies from lithotomy is that most of them resolve on their own. In one study of 15 patients who developed nerve symptoms after lithotomy procedures, all noticed the problem within four hours of waking up, and 14 of the 15 recovered completely within six months.14PubMed. Lower extremity neuropathies associated with lithotomy positions A case report of foot drop following a urethral procedure described full recovery within three months using conservative management alone: physiotherapy, targeted muscle exercises, active ankle movements, and a foot drop splint as backup.15UroToday International Journal. Foot Drop Following Visual Internal Urethrotomy in the Lithotomy Position: A Case Report and Review of Literature
Compartment syndrome is a different story. Because it involves actual muscle death rather than temporary nerve compression, WLCS can leave permanent damage and sometimes requires emergency surgery (fasciotomy) to release the pressure inside the affected compartment. The stakes are high enough that surgical teams treating patients who have been in lithotomy for hours will often check compartment pressures or watch for warning signs like unusual calf pain, swelling, or numbness before discharge.
Positioning Children in Lithotomy
Pediatric patients pose a unique challenge because their legs vary enormously in size from infancy through adolescence, and adult stirrup systems don’t scale down well. At one institution, serious lower-limb complications developed in four pediatric patients after prolonged lithotomy, including sciatic nerve injury, deep vein thrombosis, and bilateral compartment syndrome with muscle death.16PubMed. Neurovascular morbidity from the lithotomy position The authors recommended placing a child in lithotomy only for the specific portion of the operation that requires perineal access, rather than leaving them in the position for the full case.
Newer adjustable leg-support systems designed for children have shown promising results. One system tested across 59 patients aged five months to 14 years cut setup time roughly in half while increasing surgeon satisfaction, with only minor transient skin redness and no neurovascular injuries. The researchers still cautioned that surgeries lasting more than four hours may require intermittent repositioning even with the improved equipment.17PubMed. Positioning children in lithotomy with adjustable leg support
Challenges for Patients with Very High Body Weight
People with a very high BMI present a cluster of positioning problems. Standard surgical tables have weight limits that may not account for the cantilevered load of lithotomy, where the patient’s hips are at the very end of the table and the legs extend beyond it. The stirrups themselves may not accommodate larger thighs or calves, and the extra tissue mass increases external compression on the lower legs. Modified techniques have been described to improve table stability and provide alternative leg support when standard stirrups don’t fit.18PubMed. Modification of technique to safely position patients with super obesity in dorsal lithotomy for ureteroscopic management of kidney stones
Beyond logistics, obesity amplifies the medical risks of lithotomy. The combination of morbid obesity, prolonged lithotomy, and graduated compression stockings (which are normally protective but add further calf pressure in this context) has been identified as a high-risk triad that can trigger severe rhabdomyolysis and impending compartment syndrome.19PubMed Central. Case report: morbid obesity and lithotomy positioning: a high-risk triad with GCS leading to severe rhabdomyolysis with impending acute compartment syndrome following ovarian cancer cytoreduction Rhabdomyolysis occurs when damaged muscle fibers release their contents into the bloodstream, potentially overwhelming the kidneys. For this population, surgical teams often plan shorter stints in lithotomy, use wider-contact leg supports, and monitor creatine kinase levels after long cases.
How Surgical Teams Minimize Complications
Prevention comes down to a handful of practical measures that apply across patient populations:
- Time awareness: Many teams now set explicit time checks, lowering and repositioning the legs periodically during long cases rather than leaving them elevated for the entire procedure.
- Padding and support choice: Using boot-style stirrups or well-padded calf supports rather than narrow-contact devices reduces focal nerve compression.
- Positioning adjustments: Keeping the hip flexion and abduction as mild as the surgery allows limits both vascular compromise and nerve stretch. The legs should be positioned so that no bony prominence rests against a hard surface.
- Limiting Trendelenburg tilt: Because steeper head-down angles progressively worsen lower-leg perfusion, teams try to use the shallowest tilt that still gives adequate surgical access.
- Selective use in children: Rather than keeping a pediatric patient in lithotomy for an entire abdominoperineal procedure, the position is applied only for the portion that genuinely requires perineal access.
Some of these sound obvious, but they were not standard practice everywhere until complication reports made them unavoidable. The shift toward robotic-assisted pelvic surgery, which can mean four or more hours in steep Trendelenburg-lithotomy, has forced a fresh reckoning with positioning safety that was less urgent when most lithotomy procedures were short.