Navicular disease ‐ in search of definition

MacGREGOR, C. M.

doi:10.1111/j.2042-3306.1989.tb02179.x

Cited by 15 publications

(19 citation statements)

References 13 publications

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“…Previous studies using histomorphometry [25], tetracycline labelling of bone [26] and scintigraphic studies [27,28] have indicated that there is evidence of increased bone turnover in association with some forms of navicular disease, even in the absence of radiological abnormalities of the bone. Increased radiopharmaceutical uptake (IRU) predominantly reflects increased osteoblastic activity [29], but is not synonymous with either pain or lameness [30] and may reflect a functional adaptation to foot conformation and the biomechanical forces on the navicular bone or preclinical disease.…”

Section: Discussionmentioning

confidence: 99%

Comparison between magnetic resonance imaging and histological findings in the navicular bone of horses with foot pain

Dyson¹,

Blunden

Murray³

2012

Equine Veterinary Journal

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Section: Discussionmentioning

confidence: 99%

Comparison between magnetic resonance imaging and histological findings in the navicular bone of horses with foot pain

Dyson¹,

Blunden

Murray³

2012

Equine Veterinary Journal

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“…Navicular disease is a degenerative disorder that involves the navicular bone and its surrounding structures, (Pool et al 1989;Wright et al 1998) and results in a usually bilateral lameness characterised by a toe first landing and a shortening of the anterior phase of the stride (Stashak 1987;Wyn Jones 1988;Wright 1993). The aetiopathogenesis of the condition is uncertain and many theories have been proposed which are discussed in detail elsewhere (Doige and Hoffer 1983;Hickman 1989;MacGregor 1989;Pool et al 1989;Wright and Douglas 1993;Wright et al 1998). In this study, we focus on one of the mechanical theories that proposes a mechanical overload of the navicular area leads to the changes seen in the bone and its surrounding structures (Thompson et al 1991;Wright and Douglas 1993).…”

Section: Introductionmentioning

confidence: 99%

The force and contact stress on the navicular bone during trot locomotion in sound horses and horses with navicular disease

Wilson¹,

McGuigan

Fouracre

et al. 2001

Equine Veterinary Journal

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Summary Mechanical overload due to poor conformation or shoeing has been suggested to contribute to the development of navicular disease. While studies have determined the compressive force exerted on the navicular bone in normal horses, this has not been reported for horses with navicular disease. Also, the force has not been converted to stress by correction for contact area. In this study we developed a technique for the determination of the contact area between the deep digital flexor tendon and the navicular bone in vivo, and used a forceplate system to determine the force and stress on the bone at trot in 6 normal and eight diseased horses. The mean ± s.d. peak force and peak stress were 5.62 ± 1.45 N/kg and 2.74 ± 0.76 MPa for the normal group and 6.97 ± 1.50 N/kg and 3.07 ± 0.55 MPa for the navicular disease group. The peak force and peak stress were similar for both groups but the force and stress in the horses with navicular disease were approximately double control group values early in the stance phase. This was due to a higher force in the deep digital flexor tendon, which was attributed to a contraction of the deep digital flexor muscle in early stance in an attempt to unload the heels.

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“…A síndrome do navicular é considerada como causa principal de um terço das claudicações nos cavalos de esporte (Turner 1990, Pleasant & Crisman 1997, sendo específica dos equídeos (MacGregor 1989) e acomete cavalos entre 6 a 12 anos de idade sem distinção de sexo, caracterizando-se por uma claudicação intermitente, principalmente nos membros torácicos (Colles 1982). O diagnóstico, na maioria das vezes, baseia-se apenas nos sinais clínicos e na observação dos achados radiográficos.…”

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Avaliação radiográfica e ultrassonográfica do aparato podotroclear de cavalos Quarto de Milha diagnosticados com síndrome do navicular

et al. 2010

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651Pesq. Vet. Bras. 30(8):651-658, agosto 2010 RESUMO.-O objetivo deste estudo foi avaliar as alterações do aparato podotroclear de 22 cavalos da raça Quarto de Milha acometidos pela síndrome do navicular utilizando o acesso transcuneal. Esses equinos foram submetidos ao exame radiográfico e ultrassonográfico. No exame radiográfico foi observado a presença de invaginação sinovial de diferentes tipos, além de calcificação da bursa podotroclear e tendão flexor digital profundo, entesiófitos, osteófitos e alteração do limite córtico-medular. No exame ultrassonográfico observou-se alterações da bursa podotroclear, aderência e irregularidades nos bordos do tendão flexor digital profundo, diminuição do coxim digital, calcificação do ligamento sesamóide distal ímpar e irregularidade da superfície flexora do osso sesamóide distal. Todos os equinos que apresentavam alterações radiográficas também apresentaram alterações no exame ultrassonográfico compatíveis com a síndrome do navicular. O exame ultrassonográfico utilizando o acesso transcuneal foi um método prático e eficiente para avaliação das lesões do aparato podotroclear dos eqüinos, sendo um método complementar ao exame radiográfico. The objective of this study was to evaluate radiographically and ultrasonographically the podotrochlear apparatus using a transcuneal approach in 22 American Quarter horses suffering from navicular syndrome. On the radiographs, different forms of synovial invaginations, calcification of the podotrochlear bursa and deep digital flexor tendon, enthesophyte and osteophyte formation, and changes in the cortical-medullary margin were observed. On the ultrasound scans, changes of the podotrochlear bursa, adhesions and irregularities at the surface of the deep digital flexor tendon, the digital cushion area reduction, calcification of the impar distal sesamoideal ligament, and irregularities of the flexor surface of the distal sesamoid bone were observed. Radiographic and ultrasonographic abnormalities compatible with navicular syndrome were present in all patients. Ultrasonography using transcuneal approach was a practical and efficient method to evaluate podotrochlear apparatus injuries in equine, thus being a complementary method to radiography.INDEX TERMS: Transcuneal ultrasound, navicular syndrome, lameness, podotrochlear apparatus.

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Navicular disease ‐ in search of definition

Cited by 15 publications

References 13 publications

Comparison between magnetic resonance imaging and histological findings in the navicular bone of horses with foot pain

Comparison between magnetic resonance imaging and histological findings in the navicular bone of horses with foot pain

The force and contact stress on the navicular bone during trot locomotion in sound horses and horses with navicular disease

Avaliação radiográfica e ultrassonográfica do aparato podotroclear de cavalos Quarto de Milha diagnosticados com síndrome do navicular

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