Preoperative Radiographic Predictors of Subsequent Fusion After Lumbar Decompression Surgery

Area of Science:

• Spine surgery
• Degenerative spine disease
• Radiographic parameters

Background:

• High rates of repeat surgery (decompression or fusion) after initial decompression for degenerative spine disease.
• Limited literature identifies risk factors for lumbar fusion post-decompression.

Purpose of the Study:

• To identify demographic, surgical, and radiographic preoperative characteristics predicting subsequent fusion after lumbar decompression.
• To elucidate risk factors for fusion following decompression surgery.

Main Methods:

• Retrospective cohort study of 363 patients (≥18 years) undergoing primary lumbar decompression (L3-S1, 2011-2020).
• Analysis of preoperative radiographs and 2-year follow-up data.
• Inclusion of demographics, surgical details, and sagittal parameters (lumbar lordosis, segmental lordosis, disk height, sacral slope, pelvic tilt, pelvic incidence, PI-LL, Roussouly classification).

Main Results:

• 96 of 363 patients (26.4%) required subsequent fusion.
• Multivariable analysis identified significant predictors: decompression at L4-L5 (OR=1.83), increased L5-S1 segmental lordosis (OR=1.08), decreased sacral slope (OR=0.96), and decreased endplate obliquity (OR=0.88).

Conclusions:

• This study identifies key preoperative predictors for fusion after lumbar decompression.
• Findings indicate that L4-L5 decompression, greater L5-S1 segmental lordosis, decreased sacral slope, and decreased endplate obliquity are associated with increased fusion rates.