Classification
Grade I: Normal (no sclerosis, narrowing, or osteophytes)
Grade II: Minimal (minimal sclerosis, narrowing, or minor osteophytes)
Grade III: Moderate (moderate sclerosis, narrowing, or osteophytes)
Grade IV: Severe (severe sclerosis, narrowing, or osteophytes)
Explanation
Provide an explanation for key principles and pertinent aspects of the classification
Figures
Insert figures illustrating the classification
Reference(s)
Provide the citation for the landmark article and recent review articles describing the classification