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Modified S1 Pedicle Subtraction Osteotomy.

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Summary
This summary is machine-generated.

This study presents a surgical technique combining L5-S1 transforaminal interbody fusion and S1 corner osteotomy to correct flat back and sagittal imbalance after prior lumbar fusions. The method effectively restores lumbar lordosis in complex revision cases.

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Area of Science:

  • Spine surgery
  • Orthopedic surgery
  • Spinal reconstructive surgery

Background:

  • A 51-year-old female patient with a history of multiple lumbar surgeries presented with severe back pain, sagittal imbalance, and loss of lumbar lordosis.
  • Previous lumbar fusions at L4-S1 resulted in iatrogenic flat back and sagittal imbalance.

Purpose of the Study:

  • To report a novel surgical technique for revising patients with prior fusions at L4-S1.
  • To address iatrogenic flat back and sagittal imbalance by restoring lumbar lordosis and sagittal balance.

Main Methods:

  • A surgical technique involving L5-S1 transforaminal interbody fusion combined with a small S1 corner osteotomy was employed.
  • A modified S1 pedicle subtraction osteotomy and an interbody cage were utilized to optimize lordosis distribution and fusion rates.
  • The technique facilitated closure of the 3-column osteotomy.

Main Results:

  • Preoperative lordosis angles were 31 degrees (L1-L4) and 16 degrees (L4-S1).
  • Postoperative lordosis improved significantly to 12 degrees (L1-L4) and 44 degrees (L4-S1).
  • The technique successfully restored sagittal balance and lumbar lordosis.

Conclusions:

  • The combination of L5-S1 transforaminal interbody fusion and S1 corner osteotomy is a feasible revision technique.
  • This approach effectively restores lumbar lordosis in patients with prior fusion and subsequent loss of lordosis.
  • The described technique offers a solution for complex cases of failed lumbar fusion leading to sagittal imbalance.