1H NMR investigation of normal and osteo-arthritic synovial fluid in the horse.

Proton magnetic resonance spectroscopy (1H NMR) has been successfully used in the study of many biological fluids. The data presented here report on the metabolic profiles of normal equine synovial fluids compared with osteoarthritic (OA) fluids. Twenty-five OA synovial fluid samples and eight normal ones were collected from the forelimb fetlock joint in 22 horses, aged between five and 24 years. 1H NMR spectroscopy was carried out with a Bruker Avance DRX 500 equiped with a cryo-magnet working at 11 Tesla, and 'Mestre-C 4.9.9.6' software was used to analyze the spectra. The study assessed the increase of lactate, alanine, acetate, N-acetylglucosamine, pyruvate, citrate, creatine/creatinine, glycerol, HDL choline, and a-glucose in OA synovial fluid. The variations observed in samples from horses with OA compared to those in the control group, and similar data found in other studies, confirm that this technique may be useful in the study of joint metabolism. Its practical application may be in the evaluation of the treatment of OA in athletic horses.