Grade 4 OA radiographic features are:

Grade 4 OA radiographic features are:

• A. Large osteophytes; marked joint space narrowing; sclerosis + obvious deformity
• B. Moderate osteophytes; definitive joint space narrowing
• C. Definitive osteophytes; possible joint space narrowing
• D. No osteophytes; no joint space narrowing

Answer: (A)

In osteoarthritis radiographic grading, grade 4 represents the most severe changes. At this level you see all the major features together: large osteophytes at the joint margins, definite (marked) narrowing of the joint space from cartilage loss, subchondral sclerosis, and an obvious deformity of the joint due to bone remodeling and loss of normal alignment. This combination signals advanced disease, which is why the description of large osteophytes, marked joint space narrowing, sclerosis, and obvious deformity best matches grade 4. The other options describe milder patterns—smaller osteophytes, less narrowing, or no deformity—consistent with lower grades.

In osteoarthritis radiographic grading, grade 4 represents the most severe changes. At this level you see all the major features together: large osteophytes at the joint margins, definite (marked) narrowing of the joint space from cartilage loss, subchondral sclerosis, and an obvious deformity of the joint due to bone remodeling and loss of normal alignment. This combination signals advanced disease, which is why the description of large osteophytes, marked joint space narrowing, sclerosis, and obvious deformity best matches grade 4. The other options describe milder patterns—smaller osteophytes, less narrowing, or no deformity—consistent with lower grades.