Joint Diseases

Question 1

Osteoarthritis pathognomonic signs (3)

Answer 1

Osteophyte (spur)
Non uniform joint narrowing
Geode

Question 2

Septic arthritis signs

Answer 2

Subchondral resorption (central part of joint)

Question 3

Rheumatoid arthritis signs

Answer 3

Stiffness worsening with rest
SYMMETRIC joint narrowing
NO osteophytes or subchondral sclerosis
PANNUS
Medial erosions except on 5th

Question 4

Psoriatic arthritis signs

Answer 4

Sausage toe
“Pencil in cup”
“whiskering” at hallux
“Ivory phalanx”

Question 5

Seronegative arthritis signs

Answer 5

Enthesopathy

Periostitis

Question 6

Arthritities with “pencil in cup”

Answer 6

Psoriatic

Arthritis mutilans

Question 7

Arthritis mutilans

Answer 7

Both margins of any MPJ or IPJ affected

“Pencil in cup”

Question 8

Gouty arthritis signs

Answer 8

New bone formation at margin of an erosion creating an overhanging margin of bone
Normal joint space with obvious erosion

Question 9

Septic arthritis erosions show as

Answer 9

Lysis of cartilage appears as EVEN joint space narrowing

Question 10

Bywater’s sign suggests

Answer 10

Enthesopathy is part of arthropathy

Question 11

Disorders with subchondral erosion as primary sign

Answer 11

Septic arthritis

Charcot

Question 12

Arthitities with bone production

Answer 12

Osteoarthritis - osteophyte
Psoriatic arthritis - whiskering & ivory phalanx
Gouty arthritis - Overhanging margin of bone (Martel’s)

Question 13

Arthritities with normal joint space

Answer 13

Gout

Question 14

Asymmetric narrowing

Answer 14

OA/DJD

Question 15

Symmetric narrowing

Answer 15

RA

Question 16

Widening

Answer 16

Psoriatic arthritis

Question 17

DJD/OA erosions

Answer 17

None but subchondral bone cysts (geodes) may mimic erosions

Question 18

RA erosions

Answer 18

Medial except 5th

Question 19

Psoriatic erosions

Answer 19

Medial/lateral/central

Question 20

Gout erosions

Answer 20

Medial (C-shape)

Question 21

Charcot erosions

Answer 21

Subchondral resorption

Question 22

DJD/OA preferred joint

Answer 22

1st MPJ

Question 23

RA preferred joints

Answer 23

Lesser MPJs and Hallux IPJ

Question 24

Psoriatic preferred joints

Answer 24

Lesser MPJs and IPJs

Question 25

RA signs on radiograph

Answer 25

No bone production
Medial erosions except on 5th
Uniform narrowing
Lateral deviation
Bilateral symmetry

Question 26

Psoriatic signs on radiograph

Answer 26

Whiskering
Periostitis
Ivory phalanx
Sausage toe
No specific positional deformity
Erosions on both medial and lateral sides of joint

Question 27

Acral Osteolysis

Answer 27

RA
Psorioatic
Pycno
Hyperparathyroidism

Question 28

Outer Looser lines

Answer 28

Osteomalacia

Question 29

Inner loosers lines

Answer 29

Hypophosphatasia