Pathology of Bone Pt 1 Flashcards
What are the purposes of bone?
Mechanical Support
Protection
Ca++ Homeostasis
Are diseases of bone commonly found?
no they are often under diagnosed.
What is chrondrodyplasia/ chondrodystrophy? Is it associated with anything?
Chondrodysplasia/ Chondrodystrophy (Chondrodysplasia fetalis or
disproportionate dwarfism)
• Breed-associated, usually hereditary conditions that occur in dogs, cattle and
sheep. Membranous appositional growth is normal but interstitial growth of
cartilage is abnormal resulting in premature closure of growth plates and
decrease length of long bones (affects bones that form by endochondral
ossification).
What breeds of cattle are chrondrodysplasia/chrondrdystrophy common in?
Most common in beef breeds (Angus, Hereford)
What is a common bone related inherited condition of dexter cattle?
Dexter bulldog
– Congenital lethal Chondrodysplasia
What are signs of dexter bulldog?
Inherited condition of Dexter cattle.
Affected calves are often aborted and exhibit
disproportionate dwarfism,
short vertebral column, marked micromelia
(shortening of the limbs),
large head with short muzzle, protruding
tongue and large abdominal hernia
What cartilage related condition is depicted in this image?
- marked dwarfizm, aborted fetus, large abdominal hernia, protruding tongue, short muzzle, short limbs, short vertebral column.
This is dexter bulldog ( congenital lethal chondrodysplasia.
What other cattle aside from Dexter cattle can congenital lethal chondrodysplasia be seen in?
Can be seen sometimes in holstein cows.
What kind of phenotype must an animal have in order to have dexter bulldog type dwarfism? When are the calves typically aborted?
In Dexter cattle, homozygote
animals for the Dexter phenotype (Dexter “bulldog type” dwarfism) are
severely deformed and are usually aborted before 7 months of gestation (this
is the most severe form of bovine chondrodysplasia).
What do chondrodystrophic dog breeds exhibit?
Chondrodystrophic dog breeds exhibit localized chondrodysplasias involving specific bones.
What kind of chondrodysplasia is common in this dog breed?
Micromelic achondroplasia
What kind of chondrodysplasia is common in this dog breed?
Other brachiocephalic chondrodystrophic
dog breeds are Bulldogs and Boxers (brachycephalic achondroplasia).
What animals are prone to cervico-Vertebral Stenotic Myelopathy (Wobbler’s syndrome)? In dogs, what breeds specifically?
Localized skeletal dysplasia most common in horses and large breed dogs (mainly Great Danes and Doberman Pinschers).
What is another classification of Cervico-Vertebral Stenotic Myelopathy (Wobbler’s syndrome)?
- It can also be classified as a degenerative joint disease which affects the axial skeleton.
What is the result of wobblers syndrome on the animals spine?
- The syndrome results in dynamic or static compression of the cervical spinal cord (SC) by abnormal cervical vertebrae.
What is cervical compression present in the static form of wobblers syndrome? The dynamic form?
-In the dynamic form sc compression occurs when the neck is flexed; in the static form sc compression occurs no matter what position the neck is in.
What is seen in this image?
Cervical Vertebral Stenotic Myelopathy –Doberman Atlantic Veterinary College – “Ski-slope lesion”
What is osteopetrosis?
Osteopetrosis (petros: rock) Inherited disease (autosomal recessive trait) caused by lack of osteoclasts or by osteoclast failure to reabsorb the primary spongiosa. Results in increased bone density and lack of medullary (bone marrow) spaces.
What is another name for osteopetrosis?
Metaphyseal Dysplasia
What is the issue with metaphyseal dysplasia? What are clinical symptoms seen?
“Metaphyseal Dysplasia” results in diffuse osteosclerosis (↑ bone density). Most affected animals are stillborn. Since there is no space for the hematopoietic tissues of the bone marrow to grow, individuals that survive often present aplastic anemia and have a susceptibility to bone fractures. Reported mainly in dogs, sheep, cattle and horses.
What is occuring in this image?
Osteopetrosis is an heritable condition also known as “Metaphyseal Dysplasia
What is the likey bone related condition seen in this cats xrays?
Osteopetrosis
What autosomal recessive bone condition that is considered growth and development abnormality can be seen in pigs? What body part is usually affected? Why?
Congenital cortical hyperostosis of pigs
AVC
Autosomal recessive inherited condition in pigs. • Limbs (primarily the forelimbs) appear swollen
due to excessive deposition of radiating
trabeculae on the periosteal surface
(extracortical bone), and blockage of the local
lymphatic circulation.
What is the outcome of piglets borne with congenital cortical hyperosteosis ?
• Most affected pigs are born dead or die within hours.
What abnormality in kids and young monkeys is similar to congenital cortical hyperostosis of pigs?
This abnormality has been compared to Caffey’s disease (infantile cortical hyperostosis) observed
in children and young monkey
What is the condition seen in this piglet?
Congenital cortical hyperostosis of pigs
What method of inheritence is Congenital cortical hyperostosis of pigs?
Autosomal recessive inherited condition in pigs.
What is the likely issue with this pigs leg?
Congenital cortical hyperostosis
What is amelia?
The term for localized malformation resulting in the absence of a limb
What is hemimelia?
he term for localized malformation resulting in the absence of the distal half of a limb
What is polymelia?
The term for localized malformation resulting in supernumerary limbs.
What is Phocomelia?
phoco: “seal”) Severe shortening of the long bones of
the limbs. In humans was associated with the use of thalidomide (a
sedative drug) during pregnancy (feet and/or hands close to the trunk
–resembling “seal flippers”) world-wide tragedy in the 50’s & early
60’s.
What is micromelia?
Abnormally small or short limb(s)