NCT03923920COMPLETEDN/AThe investigators will prospectively evaluate for the presence of amyloid deposits in ligamentum flavum (yellow ligament) tissue samples obtained from patients undergoing spinal stenosis surgery. Patients who have tissue that stains positive for amyloid will be referred to an amyloidosis specialist.
Inclusion Criteria: * Age ≥50 years * Undergoing surgical intervention for non-congenital spinal stenosis and/or spondyloarthropathy * Able to consent Exclusion Criteria: * History of congenital spinal stenosis or congenital spondyloarthropathy