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Unstable Stifles without Clinical or Radiographic Osteoarthritis in Young Goats: An Experimental Study

Ustabile kneledd uten utvikling av arthrose på unge geiter. Et eksperimentelt studium

Abstract

Thirteen young, castrated male goats had instability of one stifle (knee joint) created by surgical transection of the cranial cruciate ligament, but did not develop any signs of osteoarthritis (OA) in treated joints when confined in limited space for 8 months. At the end of the experiment, the instability in the stifles had not improved, the joints were normal at radiographic examination, there were no signs of inflammation in the synovial membrane or joint capsule, and fibrosis in these tissues was not evident. The articular cartilage was normal both visually and histologically. This may indicate that the young age of the goats and the restricted physical activity on soft floor had prevented the expected development of OA in the experimantally operated joints.

Synovial fluid volumes and proteoglycan concentration were measured in the treated and control joints in 6 of the goats. There seemed to be increased quantity of the proteoglycan aggrecan in the synovial fluid from the treated joints compared to the contralateral joints throughout the course of this study. It was concluded that the turnover of aggrecan in the articular cartilage of the treated joints may have been increased.

Sammendrag

Det kraniale crusiata-ligamentet i venstre kneledd ble knuttet ved kirurgisk inngrep på 13 unge, kastrerte geitebukker, men geitebukkene utviklet ikke artrose i de opererte kneleddene i løpet av en postoperativ periode på 8 måneder. Geitebukkene ble oppstallet med begrenset bevegelsesfrihet og mykt underlag. Ved slutten av forsøket var ikke stabiliteten i de opererte kneleddene forbedret, men bortsett fra dette ble det ikke registrert unormale funn klinisk eller røntgenologisk. Histologisk var det ingen tydelige tegn til inflamasjon eller unormal bindevevsinnvekst i leddhinner eller leddkapsel. Brusken var normal makroskopisk og histologisk. Man antok at den rolige tilværelsen på grunn av god foring, kastrasjon og begrenset bevegelsesfrihet, det bløte underlaget og geitebukkenes unge alder hadde bidratt til å forsinke eller forhindre utvikling av artrose i de opererte kneleddene.

Leddvæske-volum og proteoglykan-konsentrasjon ble målt i de opererte ledd og de kollaterale kontroll-ledd på 6 af geitene. Det ble funnet en økning av mengden proteoglykan i de opererte ledd sammenlignet med kontrollene. Forskjellene var små, men syntes å være tilstede gjennom hele studiet. Det ble konkludert med at omsetningen av proteoglykaner i bruskmatrix på de opererte ledd kunne være forøket.

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Acknowledgment

The authors want to thank Professor Dr Monika Ostensen, Department of Rheumatology, Trondheim Central Hospital and Professor Dr Ronald D. Sande, Washington State University, for their contribution and personal support. Thanks also to Dick Heinegârd, Department of Physiological Chemistry, University of Lund, Sweden, for analyses of synovial fluids, and Nils Normann, The Hormone Laboratory, Aker Hospital, Oslo, for supplying the RISA used in the measurements. The authors also want to express gratitude to professor Peter Revell, Royal Free Hospital School of Medicine, London, and Birgit Røed, Department of Morphology, Genetics and Aquatic Biology, Norwegian College of Veterinary Medicine (NVH), for their assistance regarding the histological staining of cartilage sections. The study was supported by a grant from The Research Council of Norway.

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Rorvik, A.M., Teige, J. Unstable Stifles without Clinical or Radiographic Osteoarthritis in Young Goats: An Experimental Study. Acta Vet Scand 37, 265–272 (1996). https://doi.org/10.1186/BF03548093

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