Osteochondrosis and hip dysplasia Flashcards Preview

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Flashcards in Osteochondrosis and hip dysplasia Deck (19)
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1

Cause of hip/elbow dysplasia (HD, ED)

- genetic component (high heritability): other factors too (diet, exercise)
- Heritability factor for ED is 50-70%, for HD is 2030%

2

Define heritability factor

the proportion of a disease that can be proved to be due to genetics.
- totally d/t genetics heritability = 100%
- not d/t genetics heritability = 0%

3

How can polygenic disease be expressed?

only as a risk or liability

4

What is the function of screening?

- detect carriers (radiographic signs)
- detects primary disease (ED, HD)
- detects secondary OA
- no relevance to clinical problem/ individual animal

5

Define dysplasia

abnormality of development

6

What is HD characterised by?

- ligament hypertrophy (slack ligaments)
- subluxation (partial dislocation)
- destruction of cartilage
- change of shape of joint surface
THESE LEAD TO:
secondary OA (bony and fibrous)

7

What aspects of the clinical exam should be focused on for suspect HD?

- GAIT: abnormal HL gait, lame leg?
- PE: mm wastage in HL?, foot/tarsus/stifle/lumbosacral spine WNL, hip ROM normal, bilateral pain at full extension

8

What is the ortolani test?

- a test for subluxation
- bigger the angle of reduction, the slacker the joint capsule
- the closer the angle of reduction to angle of luxation, the shallower the acetabulum (indication for sx)

9

Outline canine bone and mm development

- bone: complete by 9mo
- mm: fully developed by 16-17 mo
- interim time (7mo - 16mo): animals are susceptible to pain, exercise intolerance etc, past this CS improve

10

Typical CS - HD - 0-6mo

- subluxation, abnormal gait

11

Typical CS - HD - 6-16mo

- subluxation
- abnormal gait
- sublux, damage and inflammation, pain, lame

12

Typical CA - HD - 16 mo +

- abnormal joint secondary OA
- pain, lame
- mm/fibrous stabilisation
- pain free restricted range

13

How do you adapt tx to geriatrics?

- same principles as young animals
- won't respond as well to physio
- harder to diet

14

Tx - HD - 0-60mo

conservative diet/exercise

15

Tx - HD - 6-16mo
What about heavier dogs?

- conservative diet/exercise (drugs)
- surgical: anatomical correction*, exploratory arthrosplasty
* dogs >15-20kg

16

Tx - HD - 16mo+
What about heavier dogs?

- conservative diet/exercise (drugs)
- sx (hip replacement*, ex. arthroplasty)
* dogs >15-20kg

17

Is there any evidence that you can induce HD through exercise?

None at all

18

Subclinical HD

- anatomical changes exist and can be documented by radiographs
- dog shows no CS

19

Describe clinical HD

anatomical changes lead to pain lameness, restricted movement, exercise intolerance