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Gunshot injuries of the sacrum.

Gunshots to the sacrum are unusual and present several management problems. Associated injuries and particularly sacral bleeding are troublesome. Conventional methods of hemostasis are not suitable in this setting as the spinal blood supply is very complex because it is largely derived from the longitudinal spinal arteries originating intracranially. Attempts at proximal control are difficult and could lead to neurological injury. We successfully managed brisk bleeding in three patients with sacral gunshots. After the major intra abdominal hemorrhage had been controlled, attention was turned to the sacral wounds that had been packed with sponges up to that time. The sacral defect was closed with bone wax to control bleeding definitively. Methyl cellulose was then put over the bone wax and the periosteum of the sacrum and posterior peritoneum (mobilized if necessary), sutured over the methyl cellulose. Post operatively the patients are carefully monitored for developing neurological deficit that would necessitate immediate sacral laminectomy and decompression. We advocate tamponading of the sacral wound with bone wax, covered by methyl cellulose and kept in place and held firm by the periosteum and posterior peritoneum sutured over it as a successful interim or definitive form of therapy.

Adolescent↗

Spinal fusions to the sacrum in adults with scoliosis.

Forty-five skeletally mature patients averaging 44.3 years of age had spinal fusions which extended to the sacrum for pain and/or progression of their scoliosis. The primary diagnosis was idiopathic scoliosis in 35 patients, congenital scoliosis in two patients, and paralytic scoliosis in eight patients. A single curve pattern was present in 41 patients and the remainder had double primary curves. Thirty-eight patients had single stage procedures and 35 of these were done posteriorly. There was an evolution in the type of posterior instrumentation used over the 12 years. Thirty-five patients (78%) had at least one significant postsurgical complication. Thirteen of 22 patients with loss of lordosis required corrective osteotomies. Other complications included pseudoarthrosis in ten patients and neurologic complications in five patients, four of which had complete recovery. Twenty-five patients required a total of 51 subsequent surgical procedures. Despite a 51% initially poor result and a high complication rate, the final results were good or fair in 93% of the patients. This change was primarily the result of successful subsequent surgical procedures for correction of loss of lordosis and pseudoarthrosis. The adult scoliosis patient should be fused to the sacrum only if the lumbosacral disc is clearly a source of pain or the degree of pelvic obliquity makes it necessary in the paralytic curve. Every effort must be made to carefully preserve the patient's lumbar lordosis. Better results were obtained by using segmental spinal fixation in the form of sublaminar wiring of double Luque rods.

Adult↗

Transverse fracture of the upper sacrum. Suicidal jumper's fracture.

Thirteen patients with transverse fractures of the upper sacrum were studied to determine fracture anatomy, clinical presentation, and therapeutic approaches. The injury results from falls from a height and is usually associated with suicidal attempts by jumping. The position of the lumbar spine in lordosis or kyphosis at the time of impact determines which of three types of morbid anatomy will result. Because of associated polytrauma, fracture of the upper sacrum is often not recognized in the acute stage, and awareness of the possibility of such injury, especially in the presence of perineal neurologic deficit should result in securing good quality radiographic study, including tomograms. Surgical treatment is often required.

Adult↗

Fusion to the sacrum for nonparalytic scoliosis in the adult.

This study is a retrospective review of 43 adult patients with idiopathic or congenital scoliosis who had spinal fusion from T11 or above to the sacrum. This study was prompted by the frustrations of the treating surgeons in attempting long fusions from the thoracic spine to the sacrum. Of 25 patients treated with a single-stage posterior fusion only 28% had a good result with a single procedure. Failures were due to pseudarthrosis, decompensation, or loss of lumbar lordosis. Ten patients treated with posterior fusion and subsequent 6-month augmentation had a 70% success rate. Eight patients treated with anterior followed by posterior fusion had a 75% success rate. The ideal answer to this clinical problem has not yet been found.

Adult↗

Long scoliosis fusion to the sacrum in adults with nonparalytic scoliosis. An improved method.

The first 17 adults with nonparalytic scoliosis having long fusion to the sacrum treated with the Luque-Galveston technique were reviewed. There were 3 men and 14 women. Their average age at the time of surgery was 47 years and the mean follow-up period was 42 months. There were no neurologic complications and no patient developed significant loss of lumbar lordosis. Fusion occurred in 88% of patients. Two patients developed pseudarthrosis, neither of whom had anterior fusion at the level of pseudarthrosis. The best results occurred in patients who had two-stage procedures, with initial anterior lumbar fusion to the sacrum without instrumentation followed by posterior segmental instrumentation with the Galveston technique of fixation to the pelvis.

Female↗

Technique and results of fixation to the sacrum with iliosacral screws.

This article describes the technique of iliosacral screw fixation, as well as a retrospective review of 28 consecutive patients who had spine fusion to the sacrum with iliosacral screws, with a minimum follow-up of 2 years. The study included 6 male and 22 female patients. Average age at the time of surgery was 43 years, and mean follow-up time was 3.5 years. There were no neurologic complications at final follow-up evaluation. Ninety-five percent of the patients had radiographic evidence of fusion. Three patients required iliosacral screw removal because of suboptimal intraoperative Kirschner-wire placement. Optimal intraoperative radiographic evaluation for accurate iliosacral screw placement is recommended. The use of iliosacral screws is also a useful addition to the armamentarium of the spine surgeon when fixation to the sacrum is required.

Adult↗

Morphometric evaluation of the first sacral vertebra and the projection of its pedicle on the posterior aspect of the sacrum.

STUDY DESIGN: This study directly measured the dimensions of the first sacral vertebra based on dry bony specimens. OBJECTIVES: To measure the dimensions of the S1 pedicle, vertebral body, and spinal canal, and determine the projections of the S1 pedicle on the posterior aspect of the sacrum. SUMMARY OF BACKGROUND DATA: Sacral screw fixation remains a challenging clinical problem because of the unique anatomy of the first sacral vertebra. The anatomic data of S1 have rarely been described in the literature. METHODS: Sacrums from 50 carefully prepared bony spines were used. Linear measurements included the dimensions of the vertebral body, spinal canal, and pedicle. Pedicle width was measured in two segments, pedicle zones 1 and 2. Angular measurements of the pedicle relative to the sagittal plane were also included. RESULTS: In pedicle zone 1, the average medial angle of the pedicles was 10.2 degrees for men and 10.7 degrees for women, average width was 10.9 mm for men and 10.4 mm for women, average length of the pedicles was 34.6 mm for men and 34.9 mm for women. In pedicle zone 2, the average medial angle of the pedicles was 39.4 degrees for both men and women, average width was 15.6 mm for men and 14.7 mm for women, average length of the pedicles was 43.7 mm for men, and 41.7 mm for women. The projections of pedicle zones 1 and 2 on the posterior aspect of S1 were determined. CONCLUSIONS: The investigators proposed the concept of pedicle zones 1 and 2. The safer area for S1 pedicle screw insertion was found in pedicle zone 2.

Adult↗

Variation in bone mineral density of the sacrum in young adults and its significance for sacral fixation.

STUDY DESIGN: Bone mineral density variations throughout the sacrum were measured and correlated with sacral screw insertion torque. OBJECTIVE: To quantify bone mineral density variations within the S1 body and ala of young human specimens, especially along the pathways of sacral screws, and to examine the relation between sacral screw fixation and bone mineral density. SUMMARY OF BACKGROUND DATA: Vertebral bone quality is an essential factor in anterior or posterior screw fixation of the spine. Several studies have been conducted regarding bone mineral density variations in the cervical and thoracolumbar spine. However, such variations in bone mineral density in the sacrum have not been well documented. METHODS: The bone mineral density of 13 sacral specimens from young male cadavers (mean age, 31 years) was measured using highly accurate quantitative computed tomography. Variations in bone mineral density were measured in five transverse layers and seven vertical columns within the S1 body, and in four transverse layers and six vertical columns within the ala. The sacral screw insertion torque was measured (unicortical and bicortical), and the correlation with bone mineral density was calculated. RESULTS: The mean bone mineral density of the S1 body was 381.9 +/- 59 mg/cm3, which was 31.9% higher than that of the sacral ala (mean, 296.9 +/- 86 mg/cm3) (P < 0.05). Bone mineral density of the superior sacral endplate was higher than that of any other transverse layer. Columns near the lateral posterior and lateral anterior of the S1 body had the highest bone mineral density. In the ala, bone mineral density values of the internal columns (pedicle) were the highest. Screw insertion torque for bicortical purchase along the S1 pedicle correlated well with the bone mineral density of the S1 body (r = 0.67, P < 0.05). CONCLUSION: This study quantified the volumetric bone mineral density variations within the S1 body and ala, and a significant linear correlation between the screw insertion torque and bone mineral density was found. Optimal sacral screw insertion pathways were also outlined based on bone mineral density values.

Adult↗

Fixation of transverse fractures of the sternum and sacrum with the locking compression plate system: two case reports.

Transverse fractures of the sternum or sacrum each present specific surgical challenges. Here, we report the successful use of a locking compression plate system in a 69-year-old woman with a displaced segmental fracture of the sternum following a motor vehicle accident and a 15-year-old girl with a low transverse fracture of the sacrum (S3-S4) as a result of a snowboarding accident. In both cases, the system provided adequate fixation to allow healing in the 2 fractures, despite the poor bone quality (sternal case) and the thin bone stock (sacral case).

Adolescent↗

Adolescent stress fractures of the sacrum: two case reports.

Two teenage female athletes had low back pain that limited athletic activity. Radiographic examination was negative. A stress fracture of the ala of the sacrum was identified on bone scan and computed tomography (CT) scan. The lesions healed with rest. This unusual lesion has not been reported previously in the pediatric literature, but is probably more common than its lack of documentation suggests. Careful observation and evaluation of athletic individuals will enable identification of this lesion. Rest should allow fracture healing, followed by return to sports participation. Stress fractures of the sacrum should be included in the differential diagnosis of adolescent low back pain.

Adolescent↗

Minor defects of the sacrum and neurogenic bladder dysfunction.

Minor defects of the sacrum are common and often dismissed as normal. The radiographs of 100 patients with urinary incontinence revealed sacral abnormalities in 43. Sacral evoked responses were measured and compared independently with the radiological findings. Patients who had defective closure of the dorsal neural arches of S1 or S2 all had abnormal nerve studies. We suggest that incomplete development of the bones of the dorsal neural arches of the upper sacrum may be a marker of incomplete neurogenesis of the sacral nerves. The sacral neurological deficit is subtle and difficult to demonstrate, but it is real and may be important in the pathogenesis of incontinence.

Adolescent↗

Primary sclerosing epithelioid fibrosarcoma of the sacrum: a case report and review of the literature.

Sclerosing epithelioid fibrosarcoma is a rare tumour characterised histologically by a predominant population of epithelioid cells arranged in strands and nests, embedded in a fibrotic and hyalinised stroma. It is a low grade tumour with an indolent course. A 48 year old woman presented with a painful swelling over her back for six months. Investigation and biopsy revealed features of sclerosing epithelioid fibrosarcoma involving the left half of the sacrum, left sacro-iliac joint, and posterior part of the left ilium. Preoperative radiotherapy and wide location excision of the tumour were followed by metastatic recurrence of the tumour in the lung and scalp six years after initial presentation. The tumour showed typical histology of sclerosing epithelioid fibrosarcoma. The radiological features confirmed its primary location in the sacrum. The patient declined chemotherapy and died of disseminated disease eight years after initial presentation. Review of the literature confirms the fact that sclerosing epithelioid fibrosarcoma, despite its low grade, is a clinicopathologically distinct tumour with full malignant potential, the recurrence, metastasis, and mortality rate being 48%, 60%, and 35%, respectively. Sclerosing epithelioid fibrosarcoma can occur as a primary bone tumour, the clinical behaviour of which is probably similar to its soft tissue counterpart.

Fatal Outcome↗

The lateral view in radionuclide imaging of the sacrum.

Radionuclide bone images in the anterior and posterior views failed to demonstrate a large metastatic tumor involving the sacrum which was obvious on the lateral view. Evaluation of the sacrum by radionuclide imaging may be incomplete without the lateral projection, particularly when there is a question of false-negative anterior and posterior views or difficulty in interpreting the radionuclide images.

Adult↗

Glomus jugulare tumor metastatic to the sacrum after high-dose radiation therapy: case report.

A 47-year-old woman with left ear pain and hearing loss was diagnosed with a glomus jugulare tumor for which she received radiation therapy as the primary treatment. Over a period of 20 years, she developed temporal bone necrosis, brain stem calcifications, local tumor recurrence, and eventually metastases to her lungs and sacrum. This case underscores the often indolent nature of glomus jugulare tumors, the late sequelae of radiation therapy for benign intracranial tumors, and the potential of these tumors to metastasize. This patient's history suggests that aggressive surgical resection should be considered early for such tumors, particularly because radiation treatment does not ablate the tumor. This is only the second reported case of a glomus jugulare tumor metastatic to the sacrum.

Aged↗

Insufficiency fractures of the sacrum after radiotherapy for gynaecological malignancy.

An entity is described which is characterized by low back pain and increased radionuclide uptake in the sacrum at bone scintigraphy in postmenopausal women having received radiotherapy towards the pelvis because of gynaecological malignancy. The findings stimulate bone metastases, but are in all likelihood caused by insufficiency fractures of the sacrum promoted by bone weakness induced by postmenopausal osteoporosis and radiotherapy combined. The increased radionuclide activity has a characteristic appearance which in the fully developed fracture acquires the shape of an 'H'. In plain radiography, changes are absent or subtle. The proper complementary examination is CT, in which the fractures can be visualized and malignant changes excluded. Awareness of this benign entity is important to avoid overdiagnosis of bone metastases.

Aged↗

Pelvic strength after major amputation of the sacrum. An exerimental study.

Major sacral resections up to the level of S 1 and even higher have been performed. This has raised the question of the degree to which such operations weaken the pelvic ring. Fifteen cadaver pelves, including the fifth lumbar vertebra, were loaded to failure, five unresected, five after resection of the sacrum between S 1 and S 2, and five after resection about 1 cm below the promontory. The weakening of the pelvic ring amounted to approximately 30 per cent with the former type of resection and 50 per cent with the latter. Taking into consideration the calculated normal load on L 5 in upright standing it seems safe from this study to allow patients to stand with full weight-bearing at an early stage postoperatively after submaximal resection of the sacrum.

Adult↗

Classification of congenital abnormalities of the sacrum. Patterns of associated dysfunctions.

Fifty-eight patients with a congenital abnormality of the sacrum were studied; a modified classification is suggested. Type 1a is characterized by an abrupt termination of the sacrum with an otherwise normal spinal column. Type 1b shows a similar sacral deficit, but with abnormalities evident higher in the spine. In Type 2 the terminal spine is malformed, and in Type 3 there is posterior sacral dysraphism. A high incidence of concomitant congenital abnormalities was found in Types 1 b and 2. Bladder dysfunction in the absence of typical clinical signs was often found in Types 1a and 1b.

Abnormalities, Multiple↗