^Jevsevar D, Donnelly P, Brown GA, Cummins DS. Viscosupplementation for Osteoarthritis of the Knee: A Systematic Review of the Evidence. The Journal of Bone and Joint Surgery. American Volume. December 2015, 97 (24): 2047–60. PMID 26677239. doi:10.2106/jbjs.n.00743.
^Witteveen AG, Hofstad CJ, Kerkhoffs GM. Hyaluronic acid and other conservative treatment options for osteoarthritis of the ankle. The Cochrane Database of Systematic Reviews. October 2015, 10 (10): CD010643. PMID 26475434. doi:10.1002/14651858.CD010643.pub2. It is unclear if there is a benefit or harm for HA as treatment for ankle OA
^Khoshbin A, Leroux T, Wasserstein D, Marks P, Theodoropoulos J, Ogilvie-Harris D, Gandhi R, Takhar K, Lum G, Chahal J. The efficacy of platelet-rich plasma in the treatment of symptomatic knee osteoarthritis: a systematic review with quantitative synthesis. Arthroscopy. December 2013, 29 (12): 2037–48. PMID 24286802. doi:10.1016/j.arthro.2013.09.006.
Mucous membranes are used by the human body to absorb the dosage for all routes of administration, except for "Dermal" and "Injection/Infusion". Administration routes can also be grouped as Topical (local effect) or Systemic (defined as Enteral = Digestive tract/Rectal, or Parenteral = All other routes).