What is Kellgren-Lawrence grade 4 characterized by?

What is Kellgren-Lawrence grade 4 characterized by?

• A. Large osteophytes, marked joint space narrowing, severe sclerosis and definite deformity of bone ends
• B. Moderate osteophytes and narrowing
• C. No features
• D. Definite narrowing and mild sclerosis

Answer: (A)

Kellgren-Lawrence grading of knee osteoarthritis on radiographs assesses how severe the joint changes are. Grade 4 is the most advanced stage and is defined by large osteophytes, marked joint space narrowing, severe subchondral sclerosis, and definite deformity of the ends of the bones. This combination reflects extensive cartilage loss with bony remodeling and alignment changes, which is why it’s the best description for a grade 4 finding. The other descriptions fit earlier stages: moderate osteophytes with narrowing corresponds to milder grades; no features is bone-healthy (grade 0); definite narrowing with only mild sclerosis points to a less severe grade than grade 4, typically grade 3.

Kellgren-Lawrence grading of knee osteoarthritis on radiographs assesses how severe the joint changes are. Grade 4 is the most advanced stage and is defined by large osteophytes, marked joint space narrowing, severe subchondral sclerosis, and definite deformity of the ends of the bones. This combination reflects extensive cartilage loss with bony remodeling and alignment changes, which is why it’s the best description for a grade 4 finding. The other descriptions fit earlier stages: moderate osteophytes with narrowing corresponds to milder grades; no features is bone-healthy (grade 0); definite narrowing with only mild sclerosis points to a less severe grade than grade 4, typically grade 3.