Re: Kucharz EJ, Kovalenko V, Szántó S, et al. A review of glucosamine for knee osteoarthritis: why patented crystalline glucosamine sulfate should be differentiated from other glucosamines to maximize clinical outcomes. Curr Med Res Opin 2016;32:997-1004

"Re: Kucharz EJ, Kovalenko V, Szántó S, et al. A review of glucosamine for knee osteoarthritis: why patented crystalline glucosamine sulfate should be differentiated from other glucosamines to maximize clinical outcomes. Curr Med Res Opin 2016;32:997-1004." Current Medical Research and Opinion, 32(11), pp. 1771–1772

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Declaration of funding

This letter was not funded.

Declaration of financial/other relationships

J.-Y.R. has disclosed that he has received consulting fees from Servier, Novartis, Negma, Lilly, Wyeth, Amgen, GlaxoSmithKline, Roche, Merckle, Nycomed-Takeda, NPS, IBSA-Genevrier, Theramex, UCB, Asahi Kasei, Endocyte; lecture fees from: Merck Sharp and Dohme, Lilly, Rottapharm, IBSA, Genevrier, Novartis, Servier, Roche, GlaxoSmithKline, Merckle, Teijin, Teva, Analis, Theramex, Nycomed, NovoNordisk, Ebewee Pharma, Zodiac, Danone, Will Pharma, Amgen; and grant support from Bristol Myers Squibb, Merck Sharp & Dohme, Rottapharm, Teva, Roche, Amgen, Lilly, Novartis, GlaxoSmithKline, Servier, Pfizer, Theramex, Danone, Organon, Therabel, Boehringer, Chiltern, Galapagos. C.C. has disclosed that he has received consultancy and honoraria from Alliance for Better Bone Health, Amgen, Eli Lilly, GSK, Medtronic, Merck, Novartis, Pfizer, Roche, Servier, Takeda and UCB. O.B. has received grant support from IBSA, Merck Sharp and Dohme, Nutraveris, Novartis, Pfizer, Rottapharm, Servier, and Theramex; and lecture fees from IBSA, Rottapharm, Servier, and SMB.