Sacrectomy Surgery: Reconstruction, Recovery, and Outcomes

Sacrectomy is the partial or complete surgical removal of the sacrum, the triangular bone at the base of the spine that connects the spinal column to the pelvis. It is one of the most demanding operations in orthopedic and spinal surgery, performed almost exclusively to treat tumors that grow in or invade the sacrum. The procedure raises unique challenges because the sacrum sits at a crossroads of nerves controlling the legs, bladder, bowel, and sexual function, while also bearing the weight of the entire upper body. Understanding what sacrectomy involves, how surgeons decide on an approach, and what patients can realistically expect afterward requires pulling together evidence on everything from blood-loss management to walking ability years down the road.

Why Sacrectomy Is Performed

The overwhelming majority of sacrectomies are done to remove primary sacral tumors. Chordomas are the most common, arising from remnants of the embryonic notochord and tending to grow in the midline of the lower sacrum, typically affecting patients in their mid-fifties. Giant cell tumors are the second most frequent indication, appearing in younger patients (average age in the mid-thirties) and favoring an off-center location in the upper sacrum. Schwannomas, another primary sacral tumor, also tend to sit eccentrically in the upper sacrum and occur at an average age in the early forties.¹ Less commonly, osteosarcomas, Ewing sarcomas, and metastatic cancers from other sites prompt the operation. Because the sacrum is deep in the pelvis and surrounded by soft tissue, these tumors often grow large before they cause symptoms like pain, numbness, or changes in bladder habits.

Levels of Resection

How much of the sacrum is removed depends on where the tumor sits and how far it extends. Surgeons classify the operation by which sacral nerve roots are sacrificed. A low sacrectomy removes the lower portion of the bone (typically below the S3 nerve roots), a middle sacrectomy takes out more of the midsacral segments, a high sacrectomy reaches above S2, and a total sacrectomy removes the entire sacrum.² The distinction matters enormously for the patient’s postoperative life, because each level corresponds to specific nerve roots that control distinct functions. A low sacrectomy can leave bladder and bowel control largely intact, while a total sacrectomy almost always compromises both.

Posterior-Only Versus Combined Approaches

Surgeons reach the sacrum either entirely from the back (posterior-only) or by combining an abdominal (anterior) approach with a posterior approach. The combined anterior-posterior route is more often chosen when the tumor extends above S2, where anterior access is needed to safely separate the tumor from pelvic organs and major blood vessels.³

At first glance, combining approaches might seem to offer a more thorough resection, but the data tell a more complicated story. A meta-analysis found that the combined approach was associated with roughly three-and-a-half-times-higher odds of local recurrence and about double the rate of postoperative complications compared with posterior-only resection. Long-term overall survival, however, was not significantly different between the two strategies at three, five, or ten years.⁴ An earlier systematic review similarly reported lower complication rates and higher five-year progression-free survival in the posterior-only group.⁵

The catch is confounding by indication: combined approaches are preferentially used for bigger, higher tumors that are inherently harder to control. The higher recurrence rate may reflect tumor complexity, not a flaw in the surgical route itself. The current consensus is that the choice should be individualized based on tumor location, size, and the need for vascular control up front, rather than defaulting to one approach for all cases.

Managing Blood Loss

The sacrum has a rich blood supply, and sacral tumors often recruit additional feeding vessels. Significant intraoperative bleeding is one of the defining risks of sacrectomy. To reduce it, many surgical teams arrange for preoperative embolization, a procedure in which an interventional radiologist threads a catheter into the arteries feeding the tumor and blocks them with particles or coils a day or two before the operation. Embolizing the middle sacral artery in particular has been shown to substantially reduce bleeding during surgery.⁶

Even with embolization, blood loss can be considerable. In one series of patients who had preoperative embolization, the average intraoperative blood loss was still roughly 1,200 mL, with a range as wide as 200 to 5,700 mL. Average transfusion was about five units of packed red blood cells.⁷ Without embolization, those numbers can be substantially higher. Surgical teams routinely prepare large volumes of blood products before the case begins.

Nerve Function After Surgery

The question that weighs most heavily on patients considering sacrectomy is what nerve function they will lose. The sacral nerve roots control the muscles of the lower legs and feet, the bladder, the bowel, and the sexual organs. Which roots are sacrificed determines the functional outcome more than almost any other variable.

A landmark study mapped these outcomes in detail. When only one side’s sacral nerves were cut and the contralateral roots were spared, about nine out of ten patients kept normal bowel and bladder function. When both S2 through S5 roots were sacrificed bilaterally, every patient lost normal bowel and bladder control. For patients who had bilateral sacrifice from S3 downward but kept both S2 roots, roughly four in ten retained normal bowel function and a quarter retained bladder function. When both S3 roots were preserved but S4 and S5 were cut on both sides, all patients kept bowel control and about seven in ten kept bladder control.⁸

The S3 nerve root emerges from these data as the critical threshold. Preservation of even one S3 root on either side gives patients a reasonable chance of maintaining continence. A systematic review confirmed that total sacrectomy, which by definition sacrifices all sacral roots bilaterally, is associated with compromised motor, bladder, bowel, sensory, and sexual function.⁹ Separate data show that bowel continence specifically correlates with the integrity of the S3 root.¹⁰

Walking and Physical Recovery

Motor function is the other major concern. The ability to walk after sacrectomy depends largely on how much of the upper sacrum and its connections to the lumbar spine are removed. In a series of total sacrectomy patients who did not receive formal spinopelvic reconstruction, 13 of 16 were able to walk. Five of those walked without any assistive device, while others needed a cane or walker. The two patients who could only sit had both undergone more extensive bilateral resections that disrupted the attachment of the iliac bones to the remaining spine.¹¹

Biomechanical gait studies at one year after total sacrectomy show that patients can walk independently but demonstrate measurable changes in how they move. The biggest compensations appear in the forward-backward and side-to-side planes, meaning patients adapt their posture and stride to make up for the lost bony connection between spine and pelvis.¹² These compensations affect energy expenditure and long-distance endurance, but most patients regain enough function for daily activities.

The level of resection matters here, too. Patients whose tumors required only lower sacral resections reported better physical health, less pain, greater mobility, and better sexual function than those who had total sacrectomy.¹³

Rebuilding the Spine-to-Pelvis Connection

After total sacrectomy, the lumbar spine is effectively floating above the pelvis with no bony bridge between them. If the connection is not restored, the spine can sink downward and tilt, causing pain and instability. Several reconstruction techniques exist, and biomechanical research has been working to sort out which ones hold up best.

In fatigue-testing experiments that simulate walking forces, an expandable cage placed between the L5 vertebra and the iliac bones dramatically outperformed older techniques like femoral strut allografts. The expandable cage survived 250,000 simulated gait cycles without failure, while the femoral strut construct failed within about 850 cycles.¹⁴ The key insight is that restoring load transfer through the L5 endplate to the pelvis matters more than the specific hardware used.

Separate biomechanical comparisons showed that dual-rod, dual-screw constructs provided the greatest overall stability among rod-based systems.¹⁵ More recent finite element modeling has explored whether reducing the distance between the lumbar spine and the pelvis during reconstruction lowers stress on the hardware. Closing that gap decreased implant stress by roughly 10 to 70 percent depending on the construct design and the direction of loading.¹⁶

Closing the Wound

Removing the sacrum leaves a deep cavity in the pelvis that needs soft tissue coverage to protect internal organs and heal properly. The wound-closure strategy is often as important as the bone reconstruction for the patient’s recovery.

A systematic review of flap options found that gluteal-based flaps were the most commonly used, accounting for about half of cases, followed by the vertical rectus abdominis myocutaneous (VRAM) flap at roughly 38 percent. Local complication rates were substantial for both: around 37 percent for gluteal flaps and 50 percent for VRAM flaps.¹⁷ When the combined anterior-posterior approach creates a communication between the abdominal cavity and the sacral defect, the VRAM flap offers the advantage of being passed through the abdomen and into the sacral wound during the anterior portion of the case, providing both skin coverage and bulk to fill the dead space.¹⁸

Wound Complications and Infection Rates

Wound healing after sacrectomy is notoriously difficult. In a large series of nearly 400 sacral tumor operations, about 29 percent of wounds developed infection or dehiscence (where the wound edges pull apart). Roughly 13 percent of patients had a surgical site infection and 16 percent had wound dehiscence. Factors that increased the risk included prior radiation, rupture of the rectum during surgery, longer operative times, and cerebrospinal fluid leakage.¹⁹

In a separate single-center study of en bloc sacrectomy for primary malignant tumors, the infection rate was even higher: 57 percent of patients developed a surgical site infection at an average of about two weeks after surgery. Being older than 65 and having a higher preoperative health-risk score were the strongest predictors.²⁰ A third series reported a 39 percent wound infection rate and found that previous lumbosacral surgery was the strongest risk factor.²¹

These numbers are high compared to most spine surgeries. The reasons are layered: the wound sits near the rectum, the patient often cannot easily shift weight off the surgical site, the dead space left by the removed bone invites fluid collection, and many patients have had prior radiation. Surgeons accept the risk because, for the tumors involved, sacrectomy is the only curative option.

Oncological Outcomes and Recurrence

The central oncological goal of sacrectomy is to remove the tumor with a margin of healthy tissue all around it. In sacral chordoma, achieving wide margins is the strongest predictor of long-term control, though even wide margins are no guarantee. One study found that 60 percent of patients with initially wide margins still developed a local recurrence.²² A separate series of 29 sacral chordoma patients treated with the combined approach reported a local recurrence rate of about 24 percent, with overall survival of roughly 84 percent at both five and ten years.²³

Recurrence patterns after sacral chordoma resection add another challenge. When researchers mapped where recurrences appeared relative to the original tumor volume, a standard 2-cm expansion around the initial tumor failed to cover all recurrence origins in nearly three-quarters of cases. Even a 5-cm expansion missed some recurrences in close to a quarter of patients.²⁴ These findings have implications for planning postoperative radiation fields and underscore why chordoma is such a persistent adversary.

Technology in the Operating Room

The sacrum’s complex three-dimensional anatomy makes it difficult for surgeons to know exactly where to cut, especially when the goal is to preserve nerve roots while achieving clear tumor margins. Computer-assisted navigation has been adopted in some centers to help. In one series of computer-navigated sacral chordoma resections, the average registration accuracy was 1.7 mm, and the technique allowed surgeons to execute their preoperative plans with 18 of 26 patients achieving wide margins.²⁵ Navigation has also been used to design modified sacrectomies that thread between nerve roots, preserving function that would otherwise be sacrificed in a conventional approach.²⁶

Another frontier is 3D-printed implants for sacral reconstruction. In a reported case, a custom titanium prosthesis was printed from the patient’s own CT images, featuring a porous mesh structure designed to encourage bone to grow into it. The implant was installed after hemisacrectomy and fixed with a rod-and-screw system. The patient was walking within two weeks and showed excellent bony fusion at one year.²⁷ A larger retrospective comparison found that 3D-printed sacral endoprostheses provided reliable spinopelvic stability after total sacrectomy, facilitating bone integration at the implant surfaces with acceptable complication rates.²⁸ The technology remains limited to specialized centers but is likely to expand as printing costs drop and design experience accumulates.

Sacrectomy in Children and Adolescents

Primary sacral tumors in pediatric patients are rare, and the tumor mix is different from adults. Ewing sarcoma, osteosarcoma, and yolk sac tumors appear more often than chordoma in younger age groups. In a study of 40 children and adolescents who underwent sacrectomy for primary malignant sacral tumors, overall survival rates were about 88 percent at one year and roughly 52 percent at five years. Lung metastasis occurred in 45 percent of patients. Children under 14 had worse outcomes than adolescents, and higher-grade tumors carried a worse prognosis.²⁹

Despite these sobering figures, long-term survival and adequate quality of life are possible in the pediatric population when the tumor is controlled.³⁰ Wound closure in small children presents its own challenges because less local tissue is available. Techniques such as acellular dermal matrix combined with gluteal advancement flaps have been used in patients as young as 22 months to close complex sacral defects after tumor removal.³¹

Quality of Life After Sacrectomy

With the high complication rates, significant nerve deficits, and long recovery, patients understandably ask whether the operation is worth it. Research on patient-reported outcomes suggests that, while sacrectomy takes a real toll, measured quality of life does not collapse in the way many people fear. One study concluded that sacrectomy does not have a disproportionate effect on overall quality-of-life scores compared with other major cancer surgeries.³² Much of this reflects the adaptability of patients who learn to manage continence changes, use assistive devices as needed, and gradually rebuild their activity levels.

The level of resection again proves to be the dominant variable. Patients with lower resections score substantially better on physical health, pain, and mobility measures than those with total sacrectomy.³³ For surgeons, this reinforces the principle that preserving as much of the upper sacrum and as many nerve roots as oncologically safe is the single most impactful thing they can do for a patient’s long-term function. For patients, it underscores the value of seeking out experienced sacral tumor centers where the surgical team has the volume and the technology to push margins as close to tumor as safely possible while sparing every nerve root they can.