10 mm) Grade 4 As above Note- Grade I of Ahlback is equivalent to grade 3 of Kellgren and Lawrence& grade 2,3,4&5 of Ahlback is equivalent to grade 4 of Kellgren and Lawrence. It must be noted that the radiological grading may not correlate with clinical symptomology of the patients. The treatment is based on the symptoms of patient (and not merely on radiographic appearances)">