Orthopedic Radiographs

Question 1

what are characteristics of aggressive bone lesions

Answer 1

1. pattern of lysis
2. cortical lysis
3. irregular periosteal reaction
4. long zone of transition
5. quick rate of change

Question 2

what are the ddx for aggressive bone lesions

Answer 2

1. neoplasia (primary vs metastatic)
2. infection (bacterial vs fungal)

NOT able to differentiate on radiographs - use signalment and bone aspirates

Question 3

distribution and appearance of developmental disorders on radiographs

Answer 3

distribution: bilateral, multifocal, or diffuse

appearance: variable; often have secondary degenerative changes

Question 4

progression of DJD lesions

Answer 4

1. increased synovial mass
2. periarticular bony growth
3. decreased joint space
4. subchondral bone sclerosis

Question 5

sign of increased synovial mass

Answer 5

intracapsular ST swelling causing displacement of the infrapatellar fat pad

cranial displacement: intracapsular effusion

caudal displacement: extracapsular effusion

Question 6

types of periarticular bony growth

Answer 6

1. osteophytes: at joint edges
2. enthesiophytes: at insertion of ST to bone

Question 7

can you determine decreased joint space on radiographs

Answer 7

NO - only can determine if radiographs are weight bearing

Question 8

appearance of subchondral sclerosis

Answer 8

increased opacity at the bone near the lesion

Question 9

distribution and appearance of metabolic disorders on radiographs

Answer 9

distribution: widespread multifocal or generalized diffuse

appearance: non-aggressive