This site is targeted at medical and radiology professionals, contains user contributed content and material that may be confusing to a lay audience. Use of this site implies acceptance of our Terms of Use.

Osteoarthritis of the knee

Case contributed by Dr Vivek Pai


Chief complaints of gradually progressive pain in both knees, increasing on activity, and a varus deformity.

Patient Data:

Age: 75
Gender: Female
Race: Indian/Pakistani

Antero - Posterior View of both knees

Modality: X-ray

AP projection of both the knees reveals severe loss of joint space in both (medial > lateral) compartments associated with osteophytes , subchondral sclerosis and an obvious varus deformity. The findings are suggestive of Grade 4 Osteoarthritis.

Case Discussion:

Currently, the Kellgren-Lawrence (KL) grading scheme is the most- widely used and accepted standard for diagnosis of radiographic OA

  • Grade 0: No radiographic features of OA are present
  • Grade of 1: Doubtful joint space narrowing (JSN) and possible osteophytic lipping.
  • Grade of 2: The presence of definite osteophytes and possible JSN on anteroposterior weight-bearing radiograph.
  • Grade 3: Multiple osteophytes, definite JSN, sclerosis, possible bony deformity
  • Grade 4: Large osteophytes, marked JSN, severe sclerosis and definitely bony deformity

Updating… Please wait.


Error Unable to process the form. Check for errors and try again.

Alert_accept Thank you for updating your details.