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Disorders of Bone in Animals

By

Stephen B. Adams

, DVM, MS, DACVS, Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Purdue University

Last full review/revision Nov 2020 | Content last modified Nov 2020

Bone diseases are generally congenital or hereditary, nutritional, or traumatic. Congenital disorders include in utero malformations and atavisms, such as polydactyly or persistent ulnae or fibulae in foals; examples of genetic defects are atlanto-occipital malformations in Arabian horses or certain cases of spinal ataxia Also see Diseases of the Spinal Column and Cord. Spinal muscular atrophy is an autosomal recessive inherited disorder of Brown Swiss calves. A mutation in the FVT1 gene is suspected. The first... read more , canine hip dysplasia Hip Dysplasiain Dogs Hip dysplasia in a 2-year-old German Shepherd, characterized by subluxation, widening of both joint spaces, and thickening of the femoral necks. Hip dysplasia is a multifactorial abnormal development... read more Hip Dysplasiain Dogs , and abnormal bone formation such as that caused by parathyroid hypoplasia.

Bone defects due to nutrition are caused primarily by imbalances or deficiencies in minerals, particularly the trace minerals such as copper, zinc, and magnesium. Calcium and phosphorus concentrations must also be present in the correct ratio. Osteomalacia Osteomalaciain Animals Osteomalacia is a disturbance of the bone metabolism of adult animals. The primary cause is an inadequate mineral supply over prolonged periods of time. Diagnosis is based on clinical presentation... read more represents the classic example of imbalanced or deficient calcium and phosphorus intake. Other nutritional disorders are caused by excessive protein intake of growing animals. Either deficiency or excess intake of certain vitamins, particularly vitamins A and D, may influence growth and development of bone. Aseptic physitis or special osteochondrotic conditions of the physes may be caused by zinc toxicity or copper deficiency.

Traumatic causes of bone disorders represent the vast majority of cases and include fractures, fissures, bone bruises, periosteal reactions as a result of trauma, sequestrum formation, and enthesopathies at the insertion of tendons and ligaments. Lack of weight bearing, lameness, reduced motion, instability, pain, heat, or swelling usually accompany these disorders.

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In all animals, the motor unit of skeletal muscle consists of the motor neuron, the neuromuscular junction, and muscle fibers. Muscle dysfunction—such as ataxia, paresis, or paralysis—most commonly originates in which of the following locations?
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