<prompt> According to American College of Rheumatology, all of the following are clinical criteria for the diagnosis of osteoahritis, EXCEPT:Lack of warmthAtrophy of quadriceps musclesCrepitusAge 50 years  <response>: Clinical criteria for the diagnosis of osteoahritis, established by the American College of Rheumatology, include: Age 50 years Stiffness 30 minutes Crepitus Bony tenderness Bony enlargement Lack of warmth The presence of 3 of these 6 criteria in the patient with chronic knee pain is 95 sensitive and 69 specific for the diagnosis of osteoahritis. Ref: Gross A., Ma C.B. 2013. Chapter 12. Approach to the Patient with Knee Pain. In J.B. Imboden, D.B. Hellmann, J.H. Stone Eds, CURRENT Diagnosis Treatment: Rheumatology, 3e. 