Juvenile Bone Disease Flashcards
Osteochondrosis
Dysfunction of endochondral ossification
Shoulder osteochondrosis
Process of cartilage turning into bone
Radiolucent defect could be thickened area of cartilage that never ossified
Ideal shot to diagnose shoulder osteochondrosis
Lateral shot = money shot
Viewing subchondral sclerosis
Joint gaps filled by sclerosis
Check surface & opacity - most likely lesion present
Diagnosing osteocondrotitis dissecans
Calcified flap of AC & if mineral fragment is seen
Elbow osteochondrosis
Subchondral defect/erosion on distal aspect of medial humeral condyle
Subchondral sclerosis would be adjacent to subchondral defect
Elbow osteochondrosis imaging
Rarely a calcified flap or fragment seen w defect
More likely if mineral fragment is seen can diagnose as osteochondritis dissecans
What view are changes in elbow osteochondrosis seen
Slight DLPMO view
Stifle osteochondrosis
Subchondral defect on distal aspect of lateral femoral condyle - less common on medial condyle
Common appearances of stifle osteochondrosis
Displacement of intrapatellar fat pat
Concave indentation
Extensor fossa for long digital extensor should not be confused w OC lesion
Tarsal osteochondrosis
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%
Commonality with different angles of tarsal
Joint spacing should be the same on all angles, if effected joint space could look wider on some angles
Diagnosing tarsal osteochondrosis
Mineral fragment could be seen w defect - most likely osteochondritis dissecans
What findings does elbow dysplasia describe?
Ununited anconeal process
Fragmented medial coronoid process
Osteochondrosis
Ununited anconeal process
Anconeal process forms from a separate center of ossifications
Process normally fuses the proximal ulna by 5 months (5.5 in GS)
Imaging diagnosis of UAP
Irregular radiolucent line across anconeal process best seen on flexed lateral view
Observe sclerosis of adjacent bone
Osteophyts on proximal edge of AP `
Fragmented medial coronoid process
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
Findings for FMCP
Incongruity between MCP and radial head - weight bearing & super imposition
30% of cases is FMCP actually visible
Common appearance in blunted edge
Panostentis
Common in 5-18 months
Medium to large breed & male
German shepherd & Bassett hounds
Panostenitis path & signs
Self limited, multi limb, shifting leg lameness
Increased intramedullary opacity, seen in diaphysis near nutrient foramen, blurring of trabecular pattern
Late signs of panostenitis
Patchy appearance in medulla, opacities may coalesce, endosteal surface is rough,
Hypertrophic osteodystrophy
Large rapidly growing dogs (Weimaraner, Great Dane)
3-5 months, common n males
Radius, ulna and tibia are commonly effected
Radio graphic findings for early hypertrophic osteodystrophy
Soft tissue swelling adjacent to physsi
Linear irregular lysis adjacent, parallel to physis
Double physeal line is common
Radio graphic findings for late hypertrophic osetodystrophy
Periosteum reaction become confluent w context resulting in marked bony enlargements of metaphysis
Retained cartilaginous core
Unknown cause
Form of osteochondrosis of distal ulnar physis
Cartilage does not transform into bone resulting in the core of cartilage in the metaphysis
Radio graphic signs of retained cart core
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
