In the third trial a multimodal physiotherapy program was studied involving taping and massage in addition to exercise (Bennell et al 2005). Moreover aerobic activity was not incorporated in the exercise program. The individual treatment arm in the study of Fransen and colleagues (2001) was excluded because aerobic activity was not incorporated in the exercise program and because heat, ultrasound, laser or interferential therapy were also part of the individual treatment. Moreover the use of

manual techniques was not specified. We were unable to find any study that directly compared any of the three intervention types to each other. Therefore LY294002 in vivo the mixed-effects meta-regression was used to analyse the relative effects of the three interventions.

Quality: The methodological quality of the studies ranged from 2 to 7 on a scale from 0 to 9 points. Four studies scored 4 points ( Maurer et al 1999, Peloquin et al 1999, Thorstensson et al 2005, Topp et al 2002) and four studies scored 5 points ( Deyle et al 2000, Ettinger et al 1997, Fransen et al 2001, Huang et al 2005). The scores of the remaining studies were 2 ( Hughes et al 2006), 3 ( Schilke et al 1996), 6 ( Hay et al 2006), and 7 points ( van Baar et al 1998). Table 1 provides an overview of the methodological quality of the included studies. Participants: In 8 of the 12 studies, the participants had clinical evidence of osteoarthritis according to the American College of Rheumatology (ACR) criteria ( Altman et al 1986). find protocol Two studies recruited patients with radiographic evidence of osteoarthritis. One study used volunteers with osteoarthritis and one study recruited adults older than 55 years who had consulted their general practitioner with pain, stiffness, or both. The mean age of participants in 11 of the 12 studies ranged from 65 to 70

years. In 10 of the 12 studies the majority were female (mean 75%; range 64% to 85%). In one study ( Thorstensson et al 2005) mean age was 56 years and 50% were female. In the study of Maurer and colleagues (1999) 58% of the patients were male. Duration of the disease ranged from 5 months to more than 10 years. Intervention type: From one study ( Ettinger click here et al 1997) we took the trial arm that examined resistance training versus a control group. From another study we took the trial arm that examined isokinetic exercise (group I) versus control ( Huang et al 2005), and in one study ( Fransen et al 2001) we classified the ‘group therapy’ as Code 2. One study examined two different strength training programs ( Topp et al 2002). The mean effects of these programs were combined and compared with the control group. Six studies were group-based, while the other six used individually delivered treatment. Five studies offered additional education and seven studies incorporated a home exercise program in the intervention.