Osteoarthritis is a primary cause of disability and functional incapacity in adults. This progressive disease is characterized by faulty repair of joint damage and degeneration of the joint, and is thought to be triggered by atypical intra-articular biomechanical or biochemical stress [Bijlsma et al. 2011; Lane et al. 2011; van Dijk et al. 2008]. Osteoarthritis is diagnosed according to clinical and radiographic features, with pain being the predominant reason for medical consultation. Mainly affecting the hand, knee, hip, spine, and foot, osteoarthritis is largely associated with episodic pain, physical disability, and a reduction in quality of life. Recent evidence indicates an association of osteoarthritis with increased risk of mortality [Nuesch et al. 2011]. The prevalence of osteoarthritis rises markedly from the age of 50 years. A study in the United States showed that major knee radiographic