"grade 0: normal facet joint width (~2-4 mm)"
"grade 1: facet joint space narrowing, small osteophytes and/or mild articular process hypertrophy"
"grade 2: facet joint space narrowing, moderate osteophytes, moderate articular process hypertrophy and/or small subarticular bone erosions"
"grade 3: facet joint space narrowing, large osteophytes, severe articular process hypertrophy, subarticular bone erosions and/or subchondral cyst formation"
"Important to consider the severity of lumbar facet joint osteoarthritis, especially before non-fusion spinal surgery, as facet joint osteoarthritis is a common cause of low back pain post-surgery 3."
Expected headings
"Classification"
"History and etymology"