Comparison of Unilateral or Bilateral Fixation in the Treatment of LFS

Inclusion criteria

• Signed informed consent.
• Patient is willing to be available for each examination scheduled over the study duration.
• Lumbar foraminal stenosis diagnosed by patient history, physical examination and image confirmation.
• Patient has symptoms referable to the stenosis level (low back pain, leg pain, tingling, numbness or weakness), which are relieved after a selective nerve root block.
• Has not responded to conservative treatment for a period of 3 months (e.g. bed rest, physical therapy, medication, manipulations, other).

Exclusion criteria

• Has systemic infection, highly communicable diseases, inflammatory or autoimmune disease (e.g. osteomyelitis, crohn's, rheumatoid arthritis, systemic lupus, gout, HIV/AIDS, active tuberculosis, venereal disease, active hepatitis).
• Has presence of active malignancy
• Has a history of severe allergy
• Has a significant medical history that, in the investigator's opinion, would not make them a good study candidate.
• Pregnant, or may become pregnant within follow-up period of study
• Has other spinal conditions that will interfere with clinical outcomes (e.g. spinal structural deformities, spinal fractures, ankylosing spondylitis, spinal tuberculosis, spinal infection, spinal tumors, symptomatic cervical spinal disease)
• Spondylolisthesis at the target level
• Has undergone previous lumbar surgery
• Has severe osteoporosis (T-score ≤ -3.5)
• BMI > 35kg/m2
• Has a diagnosis, which requires postoperative medication that interferes with fusion, such as steroids.
• Has history of endocrine or metabolic disorder known to affect osteogenesis (e.g. Paget's disease, renal osteodystrophy, Ehlers-Danios syndrome or osteogenesis imperfecta)