Hydrotherapy versus conventional land-based exercise for the management of patients with osteoarthritis of the knee: a randomized clinical trial.

Silva LE1, Valim V, Pessanha AP, Oliveira LM, Myamoto S, Jones A, Natour J
Phys Ther. 2008 Jan;88(1):12-21. Epub 2007 Nov 6

https://www.ncbi.nlm.nih.gov/pubmed/17986497