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In a follow-up study in 2008, 572 patients from the GAIT trial continued their supplementation for 2 years. After 2 years of supplementation with glucosamine and chondroitin sulfate, alone or in combination, there was no benefit in slowing the loss of cartilage, in terms of joint space width, when compared to a placebo or celecoxib. [29]
Chemical structure of one unit in a chondroitin sulfate chain. Chondroitin-4-sulfate: R 1 = H; R 2 = SO 3 H; R 3 = H. Chondroitin-6-sulfate: R 1 = SO 3 H; R 2, R 3 = H.. Chondroitin sulfate is a sulfated glycosaminoglycan (GAG) [1] composed of a chain of alternating sugars (N-acetylgalactosamine and glucuronic acid).
Although joint fluid concentrations of glucosamine reached 9–15 μmol/L following intravenous dosing, it was only 0.3–0.7 μmol/L with nasogastric dosing. The authors calculated that these glucosamine synovial fluid levels achieved by the oral route were 500 times lower than that required to have a positive effect on the metabolism of ...
Members of the glycosaminoglycan family vary in the type of hexosamine, hexose or hexuronic acid unit they contain (e.g. glucuronic acid, iduronic acid, galactose, galactosamine, glucosamine). They also vary in the geometry of the glycosidic linkage. Examples of GAGs include:
A joint or articulation (or articular surface) is the connection made between bones, ossicles, or other hard structures in the body which link an animal's skeletal system into a functional whole. [1] [2] [3] They are constructed to allow for different degrees and types of movement.
A multiaxial joint, such as the hip joint, allows for three types of movement: anterior-posterior, medial-lateral, and rotational. A multiaxial joint (polyaxial joint or triaxial joint) is a synovial joint that allows for several directions of movement. [9] In the human body, the shoulder and hip joints are multiaxial joints. [10]