A study of 118 cases of navicular disease: clinical features.
The clinical features are reported from 118 horses (mean age 9.2 years) which were diagnosed as suffering from navicular disease using predetermined criteria. The animals were used for a variety of purposes and had been lame for periods between 1 and 72 months. The majority of cases (84.7%) had been treated using various techniques before evaluation. The severity of lameness was related to the duration of clinical signs: 78% of horses were bilaterally affected but there was no left:right limb predominance. Broken foot/pastern axes were recorded in 75% of horses while 45% also exhibited mediolateral foot imbalance. Muscle atrophy was recognised in 77% of animals which appeared to be related to limb affliction. The cranial phase of the stride was reduced in 38% and caudal phase shortened in 16% of horses. These abnormalities were related to the degree of lameness. Flexion of the distal joints increased the severity of lameness in 64% of the animals while extension was positive in 41% of instances. Turning in the direction of the lame limb exacerbated lameness in 95% of horses. Only 11% of animals responded to the use of hoof testers and 3% to foot percussion. A range of responses to local analgesia of the palmar digital nerves was recorded but 91% (of 49) of animals exhibited a positive response to local analgesia of the distal interphalangeal joint, and 92% (of 23) of horses responded to local analgesia of the navicular bursa.
Wright
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IM
Equine Clinical Unit, Animal Health Trust, Newmarket, Suffolk, UK.
D000818:Animals; D005260:Female; D005534:Foot Diseases / Q000209:etiology / Q000503:physiopathology / Q000662:veterinary; D005684:Gait; D006724:Hoof and Claw / Q000473:pathology; D006734:Horse Diseases / Q000209:etiology / Q000503:physiopathology*; D006736:Horses; D007794:Lameness, Animal / Q000209:etiology / Q000503:physiopathology*; D008297:Male; D009132:Muscles / Q000473:pathology; D012716:Sesamoid Bones