1. Wang TJ, et al. Effects of aquatic exercise on flexibility, strength and aerobic fitness in adults with osteoarthritis of the hip or knee. J Adv Nurs. 2007;57(2):141–52.
2. Cross M, et al., The global burden of hip and knee osteoarthritis: estimates from the Global Burden of Disease 2010 study. Annals of the rheumatic diseases, 2014. doi:
10.1136/annrheumdis-2013-204763
3. Office of National Statistics. Statistical Bulletin: Estimates of the very old (including centenarians) for the United Kingdom, 2002-2012. 2014 [cited 2016; Available from:
www.ons.gov.uk/ons/dcp171778_357100.pdf
. Accessed 4 May 2017.
4. United Nations Department of Economic and Social Affairs. World Population Ageing 2013. 2013 [cited 2016; Available from:
http://www.un.org/en/development/desa/population/publications/pdf/ageing/WorldPopulationAgeing2013.pdf
. Accessed 4 May 2017.
5. Le TK, et al. Health care costs in US patients with and without a diagnosis of osteoarthritis. J Pain Res. 2012;5:23–30.