“…The K/L scale is the scale most commonly used to evaluate the radiographic severity of knee OA [7,12,15,16,23,25,26,45]. Although the presence of an osteophyte or cyst, joint space narrowing, and subchondral sclerosis are all considered when determining the radiographic severity, the presence of definite osteophytes, the key feature of K/L Grade 2, is commonly used as the diagnostic criterion of knee OA [7,12,15,25,45].…”