Intro to young horse joint disease Flashcards
List the 2 diseases osteochondrosis is subdivided into
Osteochondritis Dissecans (OCD)
Subchondral Cystic Lesions (SCL)
Describe the pathogenesis of osteochondrosis
Focal failure of endochondral ossification at epiphyseal growth cartilage
Follows trauma to microvasculature
Lesions form during period of fast growth
when do lesions of osteochondrosis originate
<2 yrs old
List 4 factors that can cause the formation of osteochondrosis
is multifactorial:
Polygenetic heritable disease
Overnutrition
Rapid growth
Mineral imbalances
Describe the pathogenesis of osteochondrosis
a defect occurs in endochondral ossification
retention of this cartilage and then its subsequent necrosis leads to subchondral cystic lesion
what can osteochondrosis progress to
Osteochondritis Dissecans
subchondral cystic lesion
How does osteochondrosis progress to osteochondritis dissecans
Fissures appear in thickened cartilage
Mineralisation occurs within the lesion
Sometimes break free
- fragmentation
How does osteochondrosis progress to subchondral cystic lesion
Necrosis of thickened cartilage
Cyst has an inflammatory lining, so is self-propagating
- lysis
Describe the incidence of osteochonrosis
lesions develop <2 yr
clinical signs occur- either immediately, when working or sometimes never
TB and WB
when does Osteochondral Fragmentation tend to occur
any age- because is traumatic
can happen in any athletic horse
describe the clinical presentation of Juvenile osteochondral conditions (JOCC)
Varying degree of
- joint effusion
- lameness
- heat
Positive to joint flexion
Inflammation due to synovitis & osteitis
sometimes no signs- only found on vet checks
Desribe how to diagnose Juvenile osteochondral conditions (JOCC)
History
palpaion
lameness assessment
regional anaesthesia
radiographs
ultrasound
what is Roentgens signs
- Radiographic description
- Make an assessment of pathology
- Diagnosis
List 5 things that you say to describe a radiographic lesion
Number
size
shape
opacity
location
Describe how to treat Juvenile osteochondral conditions (JOCC)
Conservative- no treatment
medical- intra-articular meds
surgical - arthroscopic fragment removal or debridement of disease cartilage & necrotic subchondral bone
choice depends on severity
