Impact of sarcopenia and multifidus atrophy on outcomes from minimally invasive decompression surgery for lumbar spinal stenosis

Multifidus FI predicts postoperative improvement in disability following minimally invasive decompression for lumbar spinal stenosis with high accuracy. Minimally invasive decompression surgery is effective for elderly patients and sarcopenic patients, who are not at risk for poorer postoperative outcomes. Male gender and lower preoperative pain or disability are risk factors for postoperative deterioration in patient-reported outcomes.