Synovial fluid chondroitin sulphate indicates abnormal joint metabolism in asymptomatic osteochondritic horses

Synovial fluid chondroitin sulphate indicates abnormal joint metabolism in asymptomatic osteochondritic horses

Author Machado, T. S. L. Google Scholar
Correia da Silva, L. C. L. Google Scholar
Baccarin, Raquel Yvonne Arantes Autor UNIFESP Google Scholar
Michelacci, Y. M. Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Abstract Reasons for performing study: Alternative methods to evaluate the joint condition in asymptomatic osteochondrosis dissecans (OCD) and other joint diseases may be useful. Objectives: To investigate possible changes in synovial fluid composition that may lead to joint conditions in asymptomatic OCD, in mature horses. Methods: Animals aged >2 years, of different breeds, with OCD in the intermediate ridge of distal tibia, symptomatic or not, were studied. Synovial fluid samples (10 healthy; 11 asymptomatic OCD; 25 symptomatic OCD) were collected by arthroscopy from 29 horses. Glycosaminoglycans (GAGs) were analysed by a combination of agarose gel electrophoresis and enzymatic degradation with specific GAG lyases. the viscosity, white blood cell (WBC) count, protein concentration and hyaluronic acid (HA) molecular weight were also determined. Results: the method used here to analyse synovial fluid GAGs is reliable, reproducible and specific. the main synovial fluid GAGs are HA and chondroitin sulphate (CS), 93% and 7% respectively in normal horses. in symptomatic OCD, the concentrations of both increased (expressed as GAG/urea ratios), but CS increased more. the CS increased also in asymptomatic OCD. An inflammatory reaction was suggested by the increased WBC counts in OCD. the molecular weight of the synovial fluid HA was reduced in OCD, explaining the lower viscosity observed. Conclusions: the increased CS in synovial fluid of OCD joints in mature horses suggests that the synovial fluid CS and the WBC count are good markers of the joint conditions, allowing the identification of pathological phase in joint diseases. Potential relevance: the analysis of synovial fluid GAGs shows that cartilage damage occurs even in asymptomatic OCD, implying that arthroscopic removal of osteochondral fragments should be performed even in asymptomatic OCD.
Keywords horse
chondroitin sulphate
hyaluronic acid
osteochondrosis dissecans
synovial fluid
Language English
Sponsor Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Sociedade Paulista para o Desenvolvimento da Medicina (SPDM - FADA), São Paulo, SP, Brazil
Date 2012-07-01
Published in Equine Veterinary Journal. Hoboken: Wiley-Blackwell, v. 44, n. 4, p. 404-411, 2012.
ISSN 0425-1644 (Sherpa/Romeo, impact factor)
Publisher Wiley-Blackwell
Extent 404-411
Access rights Closed access
Type Article
Web of Science ID WOS:000304864300008

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