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Abstracts

Comparison of Surgical Treatment in Lenke 5C Adolescent Idiopathic Scoliosis: Anterior Dual Rod Versus Posterior Pedicle Fixation Surgery: A Comparison of Two Practices

Geck, Matthew J. MD; Rinella, Anthony MD; Hawthorne, Dana PA; Macagno, Angel MD; Koester, Linda BS; Sides, Brenda MA; Bridwell, Keith MD; Lenke, Lawrence MD; Shufflebarger, Harry MD

Study Design. Multicenter analysis of 2 groups of patients surgically treated for Lenke 5C adolescent idiopathic scoliosis (AIS).

Objective. Compare patients with Lenke 5C scoliosis surgically treated with anterior spinal fusion with dual rod instrumentation and anterior column support with patients surgically treated with posterior release and pedicle screw instrumentation.

Summary of Background Data. Treatment of single, structural, lumbar, and thoracolumbar curves in patients with AIS has been the subject of some debate. Advocates of the anterior approach assert that their technique spares posterior musculature and may save distal fusion levels, and that with dual rods and anterior column support the issues with nonunion and kyphosis have been obviated. Advocates of the posterior approach assert that with the change to posterior pedicle screw based instrumentation that correction and levels are equivalent, and the posterior approach avoids the issues with nonunion and kyphosis. This report directly compares the results of posterior versus anterior instrumented fusions in the operative treatment of adolescent idiopathic Lenke 5C curves.

Methods. We analyzed 62 patients with Lenke 5C based on radiographic and clinical data at 2 institutions: 31 patients treated with posterior, pedicle-screw instrumented fusions at 1 institution (group PSF); and 31 patients with anterior, dual-rod instrumented fusions at another institution (group ASF). Multiple clinical and radiographic parameters were evaluated and compared.

Results. The mean age, preoperative major curve magnitude, and preoperative lowest instrumented vertebral (LIV) tilt were similar in both groups (age: PSF = 15.5 years, ASF = 15.6 years; curve size: PSF = 50.3° ± 7.0°, ASF = 49.0° ± 6.6°; LIV tilt: PSF = 27.5° ± 6.5°, ASF = 27.8° ± 6.2°). After surgery, the major curve corrected to an average of 6.3° ± 3.2° (87.6% ± 5.8%) in the PSF group, compared with 12.1° ± 7.4° (75.7% ± 14.8%) in the ASF group (P < 0.01). At final follow-up, the major curve measured 8.0° ± 3.0° (84.2% ± 5.8% correction) in the PSF group, compared with 15.9° ± 9.0° (66.6% ± 17.9%) in the ASF group (P = 0.01). This represented a loss of correction of 1.7° ± 1.9° (3.4% ± 3.7%) in the PSF group, and 3.8° ± 4.2° (9.4% ± 10.7%) in the ASF group (P = 0.028). The LIV tilt decreased to 4.1° ± 3.4° after surgery in the PSF group, and 4.5° ± 3.7° in the ASF group. At final follow-up, the LIV tilt was 5.1° ± 3.5° in the PSF group, and 4.5° ± 3.7° in the ASF group. EBL was identical in both groups, and length of hospital stay was significantly (P < 0.01) shorter in the PSF group (4.8 vs. 6.1 days). There were no complications in either group which extended hospital stay or required an unplanned second surgery.

Conclusion. At a minimum of 2-year follow-up, adolescents with Lenke 5C curves demonstrated statistically significantly better curve correction, less loss of correction over time, and shorter hospital stays when treated with a posterior release with pedicle screw instrumented fusion compared with an anterior instrumented fusion with dual rods for similar patient populations.

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Assessment of Cervical Ligamentous Injury in Trauma Patients Using MRI

Geck, Matthew J.; Yoo, Stephen; Wang, Jeffrey C.

During a 7-year period, a consecutive retrospective series of 89 trauma patients at a Level One trauma center who had negative standard radiographs with suspected occult cervical injury were administered a cervical magnetic resonance imaging (MRI) scan. The MRI studies were fully able to assess the ligamentous status of the cervical spine in all patients and were the final step in determining the treatment of the spine. Of the total 89 patients, 82 had no ligamentous injury, and 7 had ligamentous injury. Two patients underwent surgery because of the findings on the MRI study. MRI studies of patients with negative standard radiographs but with suspected occult cervical injury are excellent and safe studies for the evaluation of cervical spinal stability because of their ability to detect ligamentous injuries that are not evident on plain radiographs.

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The Ponte Procedure: Posterior Only Treatment of Scheuermann's Kyphosis Using Segmental Posterior Shortening and Pedicle Screw Instrumentation

Geck, Matthew J. MD; Macagno, Angel MD; Ponte, Alberto MD; Shufflebarger, Harry L. MD

Study Design: Case series.

Objective: To examine a consecutive series of surgically treated Scheuermann kyphosis that had a posterior only procedure with segmental pedicle screw fixation and segmental Ponte osteotomies.

Summary of Background Data: The gold standard for surgical treatment of Scheuermann kyphosis (a rigid kyphosis associated with wedged vertebral bodies occurring in late childhood or adolescence) has been combined anterior and posterior approach surgery. Alberto Ponte has advocated a posterior-only procedure with posterior column shortening via segmental osteotomies, but his procedure has not been widely accepted owing to concerns that without anterior column support there would be a risk of correction loss and/or instrumentation failure. With the advent of improved spinal instrumentation and fixation with thoracic pedicle screws, the Ponte procedure may offer an advantage over anterior/posterior reconstruction.

Methods: The study prospectively enrolled 17 consecutive patients with Scheuermann kyphosis who were treated with the Ponte procedure by the senior surgeon at one institution. Standardized radiographic analysis was performed and included full-length coronal and sagittal radiographs preoperatively, postoperatively, and at final follow-up. Analysis also included the correction obtained through the most severe, wedged segments of the deformity by the osteotomies.

Results: Seventeen patients had the Ponte procedure satisfactorily performed. No patient needed an anterior approach to achieve sufficient correction or fusion. There were no reoperations for nonunion or instrumentation failure. Correction of the instrumented levels was 61% and of worst Cobb was mean 49%. The apex of the deformity was measured over the most deformed 3 to 7 wedged segments. The average correction across the apex was 9.3 degrees per osteotomy (range 5.9 to 15). No patient lost more than 4 degrees of correction through their instrumented and fused levels. There were no neurologic complications. There was one late infection with a solid fusion treated with instrumentation removal and intravenous antibiotics.

Conclusions: Using thoracic pedicle screw instrumentation as the primary anchor, the Ponte procedure was successfully performed in 17 consecutive patients for Scheuermann kyphosis with no exclusions for the size or rigidity of the kyphosis. Results were as good as anterior/posterior historical controls with excellent correction and minimal loss of correction at final follow-up. This procedure avoids the morbidity and extended operative time attributed to the anterior approach.

Level of Evidence: Therapeutic study, level IV [case series (no, or historical, control group)].

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Journals

SRS Global Outreach Mission Report Form
http://www.srs.org/professionals/outreach/mission_report_cali-1.pdf

Surgical options for the treatment of cervical spondylotic myelopathy
Matthew J Geck, Frank J Eismont
Orthopedic Clinics of North America
April 2002 (Vol. 33, Issue 2, Pages 329-348)
http://www.orthopedic.theclinics.com/issues/contents?issue_key=S0030-5898%2800%29X0001-6

Treatments
  • Traditional Treatments
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  • Scoliosis Surgery
    • Learn about advances in scoliosis treatment and current minimally invasive options.
  • Osteotomy Surgery
    • For the most complex spinal deformities learn about how osteotomy surgery can balance the spine.
  • Thoracoscopic Surgery
    • Video assisted thoracoscopic surgery uses techniques for minimal invasion of the chest wall or thoracic cavity.
  • Vertebral Body Stapling
    • Vertebral body stapling is an innovative, minimally invasive approach that is an alternative therapy for early onset scoliosis.
  • XLIF, DLIF, TLIF
    • Learn about minimally invasive interbody techniques such as XLIF, DLIF, and TLIF.
What do Your Symptoms Indicate?
  • Red Flag Symptoms
    • Many back problems can improve on their own or with non-surgical treatment. They key is to understand which symptoms are emergencies and need to be seen immediately.
Home Remedy Book
  • Home Remedy Book
    • Have back or neck pain? Learn what causes symptoms and the home remedies that relieve pain. Scoliosis Texas mails out Home Remedy Books to residents throughout the Austin area.

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