Humerus: OC(D)

Question 1

Potential mechanisms of OC(D)?

Answer 1

Abnormal maturation of cartilage
Compromized vascular supply to the region
Trauma
Nutrition
Genetic factors

Question 2

Localisation of OCD of the humerus?

Answer 2

Abnormally thickened cartilage at the most medial and distal region of the humeral condyle, partial or complete separation from subchondral bone

Question 3

Breed, age?

Answer 3

Labrador retriever
Golden retriever
Rottweiler
Bernese Mountain dog

4 months and older - most dogs presented later

Question 4

Presentation?

Answer 4

Unilateral or bilateral forelimb lameness and excercise intolerance
inactivity stiffness
large joint effusion

Question 5

Pathophysiology?

Answer 5

Capillary bed compression - transchondral fractures
Incongruity
In conjunction with FCP in 12% of cases

Question 6

Diagnostic findings?

Answer 6

Muscle atrophy
Joint pain
Effusion
Decreased ROM

Question 7

Imaging modalitites?

Answer 7

CT
XR
(arthroscopy, arthrotomy)

Question 8

Treatment?

Answer 8

Conservative: NSAID, rest, BCS
Surgical: removal of loose cartilage, debridement, osteostixis

Question 9

Prognosis?

Answer 9

Variable - management should be considered lifelong