“…For instance, it is surprising that the efficacy of hypnosis for OA pain relief has not been studied, despite the fundamental and clinical research evidence that hypnosis affects pain. Indeed, fundamental research has established that hypnosis is efficient as a cognitive intervention to produce analgesia (Hilgard, 1975; Hilgard and Hilgard, 1975; Sheehan and Perry, 1976; Girodo and Wood, 1979; Spanos et al ., 1984, 1985, 1990; Tripp and Marks, 1986; Stam et al ., 1984; Elton et al ., 1988; Zeltzer et al ., 1989; Baker and Kirsch, 1993; Chaves, 1999; Zachariae and Bjerring, 1994, Montgomery et al ., 2000) and to alter pain perception—hypo‐ and hyperalgesia (Meier et al ., 1993) or to decrease or increase pain threshold (Arendt‐Nielsen et al ., 1990)—as well as to differentiate dimensions of pain (Houle et al ., 1888; Malone et al ., 1989; Price, 1996; Price and Barber, 1987; Rainville et al ., 1999). Further, Kiernan et al ., (1995) report that hypnosis has a measurable physiological effect in modifying pain level.…”