Juvenile Bone Disease

Question 1

Osteochondrosis

Answer 1

Dysfunction of endochondral ossification

Question 2

Shoulder osteochondrosis

Answer 2

Process of cartilage turning into bone
Radiolucent defect could be thickened area of cartilage that never ossified

Question 3

Ideal shot to diagnose shoulder osteochondrosis

Answer 3

Lateral shot = money shot

Question 4

Viewing subchondral sclerosis

Answer 4

Joint gaps filled by sclerosis
Check surface & opacity - most likely lesion present

Question 5

Diagnosing osteocondrotitis dissecans

Answer 5

Calcified flap of AC & if mineral fragment is seen

Question 6

Elbow osteochondrosis

Answer 6

Subchondral defect/erosion on distal aspect of medial humeral condyle
Subchondral sclerosis would be adjacent to subchondral defect

Question 7

Elbow osteochondrosis imaging

Answer 7

Rarely a calcified flap or fragment seen w defect
More likely if mineral fragment is seen can diagnose as osteochondritis dissecans

Question 8

What view are changes in elbow osteochondrosis seen

Answer 8

Slight DLPMO view

Question 9

Stifle osteochondrosis

Answer 9

Subchondral defect on distal aspect of lateral femoral condyle - less common on medial condyle

Question 10

Common appearances of stifle osteochondrosis

Answer 10

Displacement of intrapatellar fat pat
Concave indentation
Extensor fossa for long digital extensor should not be confused w OC lesion

Question 11

Tarsal osteochondrosis

Answer 11

75% MTR
25% LTR
Increased width of joint space over medial ridge
Flattening of medial ridge
Mineralized flap over medial ridge
Intracapsular swelling tarsocruiral joint
Bilateral 44%

Question 12

Commonality with different angles of tarsal

Answer 12

Joint spacing should be the same on all angles, if effected joint space could look wider on some angles

Question 13

Diagnosing tarsal osteochondrosis

Answer 13

Mineral fragment could be seen w defect - most likely osteochondritis dissecans

Question 14

What findings does elbow dysplasia describe?

Answer 14

Ununited anconeal process
Fragmented medial coronoid process
Osteochondrosis

Question 15

Ununited anconeal process

Answer 15

Anconeal process forms from a separate center of ossifications
Process normally fuses the proximal ulna by 5 months (5.5 in GS)

Question 16

Imaging diagnosis of UAP

Answer 16

Irregular radiolucent line across anconeal process best seen on flexed lateral view
Observe sclerosis of adjacent bone
Osteophyts on proximal edge of AP `

Question 17

Fragmented medial coronoid process

Answer 17

Hard to diagnose by radiograph - usually rule out other diagnoses to conclude its a FMCP
Often bilateral
CT is more sensitive testing
Can diagnose based of DJD and no OC or UAP

Question 18

Findings for FMCP

Answer 18

Incongruity between MCP and radial head - weight bearing & super imposition
30% of cases is FMCP actually visible
Common appearance in blunted edge

Question 19

Panostentis

Answer 19

Common in 5-18 months
Medium to large breed & male
German shepherd & Bassett hounds

Question 20

Panostenitis path & signs

Answer 20

Self limited, multi limb, shifting leg lameness
Increased intramedullary opacity, seen in diaphysis near nutrient foramen, blurring of trabecular pattern

Question 21

Late signs of panostenitis

Answer 21

Patchy appearance in medulla, opacities may coalesce, endosteal surface is rough,

Question 22

Hypertrophic osteodystrophy

Answer 22

Large rapidly growing dogs (Weimaraner, Great Dane)
3-5 months, common n males
Radius, ulna and tibia are commonly effected

Question 23

Radio graphic findings for early hypertrophic osteodystrophy

Answer 23

Soft tissue swelling adjacent to physsi
Linear irregular lysis adjacent, parallel to physis
Double physeal line is common

Question 24

Radio graphic findings for late hypertrophic osetodystrophy

Answer 24

Periosteum reaction become confluent w context resulting in marked bony enlargements of metaphysis

Question 25

Retained cartilaginous core

Answer 25

Unknown cause
Form of osteochondrosis of distal ulnar physis
Cartilage does not transform into bone resulting in the core of cartilage in the metaphysis

Question 26

Radio graphic signs of retained cart core

Answer 26

Conical shaped radiolucent zone extended from distal ulnar physis into distal ulnar metaphysis
Lesions can be incidental can contain a symmetrical shape, confined to medullary region of bone