For example, people with osteoarthritis are more sensitive to experimental noxious stimuli at body sites distant from their

affected joints compared to people without arthritic pain (Farrell et al 2000, Imamura et al 2008, Lee et al 2011). Prolonged osteoarthritic pain is also associated with neurochemical, molecular and metabolic re-organisation in both the peripheral and central nervous systems (Farrell et al 2000, Bajaj et al 2001, Fernandezde-las-Penas et al 2009, Imamura et al 2008, Gwilym et al 2009, Im et al 2010, Mease et al 2011). These profound changes help to explain the diverse clinical manifestations of osteoarthritis, such as discordances between the degree of What is already known on this topic: People with osteoarthritis can experience local pain due to peripheral nociception, but recent research suggests they may also have generalised hyperalgesia. Among people with thumb carpometacarpal osteoarthritis, radial nerve mobilisation GSK126 had local hypoalgesic effects. What this study adds: Rapamycin Among people with unilateral thumb carpometacarpal osteoarthritis, radial nerve mobilisation also reduces pressure-pain thresholds in the contralateral hand, suggesting bilateral hypoalgesic effects. Interestingly, central sensitisation has been documented

in people with knee and hand osteoarthritis (Creamer et al 1996, Bajaj et al 2001, Farrell et al 2000, Imamura et al 2008). Bilateral hyperalgesia has been reported in the tibialis anterior muscle in people with unilateral knee osteoarthritis (Bajaj et al 2001). Injection of local anesthetic

in one knee was followed by pain relief in the contralateral, non-injected knee (Creamer et al 1996). Additionally, people with moderate to severe persistent knee pain have significantly lower pressure pain thresholds than controls (Imamura et al 2008). The role of central sensitisation mechanisms in maintenance and augmentation of upper extremity pain has been also studied in unilateral carpal tunnel (Fernandez-delas- Penas et al 2009) and lateral epicondylalgia (Fernandez-Carnero et al 2009), illustrating bilateral widespread pressure pain hypersensitivity, perhaps due to peripherally maintained central sensitisation. This sensitisation in both peripheral and central sensory neural pathways is believed to be relevant to the Phosphoprotein phosphatase initiation and maintenance of persistent pain (Graven-Nielsen and Arendt-Nielsen 2002). An important feature of central sensitisation in osteoarthritis pain is hyperalgesia, often radiating far from the painful joint (Nijs et al 2009). Several studies indicate that manual therapies can induce mechanical hypoalgesia (Vicenzino et al 1996, Sterling et al 2001, Vicenzino et al 2001, Villafañe et al 2011a, Villafañe et al 2012a, Villafañe et al 2012b). This effect may be concurrent with sympathetic nervous system (Vicenzino et al 1996) and motor (Sterling et al 2001) excitation.