7. Patient with a unilateral or bilateral OA of the knee or hip diagnosed according to the American College of Rheumatology (ACR) criteria based on clinical and radiographic evidence (Altman et al., 1986) (in case of bilateral OA or OA of both knee and hip, the joint to consider should be the most affected one). The clinical diagnosis of OA will be confirmed by the ACR clinical criteria and medical imaging criteria for classification of OA of the knee or hip based upon the following criteria: