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Area of Science:

  • Spine surgery
  • Orthopedic biomechanics
  • Radiographic analysis

Background:

  • Middle-column gap balancing (MCGB) measures posterior longitudinal ligament (PLL) path and load-sharing components.
  • MCGB quantifies "middle-column mismatch" to assess ligamentous redundancy and optimize implant height.
  • This metric aids in determining correct cage, spacer, or load-bearing height for spinal procedures.

Purpose of the Study:

  • To evaluate the reliability and utility of MCGB in spinal deformity surgery.
  • To determine if MCGB measurements can predict optimal postoperative spinal height and alignment.
  • To assess the correlation between preoperative and postoperative MCGB measurements.

Main Methods:

  • Phase 1: Radiographic studies of 24 patients to assess MCGB reliability using custom software for curved line measurement.
  • Phase 2: Pre- and postoperative MCGB measurements in 21 multilevel deformity patients by blinded observers.
  • Statistical analysis included linear regression and Pearson product-moment correlation.

Main Results:

  • Phase 1 demonstrated MCGB provides reliable spinal axial height measurements.
  • Phase 2 showed a strong, statistically significant positive correlation (r=0.983, P<.01) between preoperative and postoperative MCGB measurements.
  • The study confirmed MCGB's utility in predicting optimal spacer and vertebral body height.

Conclusions:

  • MCGB is a valuable tool for predicting optimal intervertebral disk, spacer, and posterior vertebral body height in deformity correction.
  • Optimizing spinal height, considering its curved nature, is crucial for restoring sagittal and coronal alignment.
  • Software-assisted measurement of the PLL's curved path aids in achieving optimal postoperative middle-column height.