44: Radiographic Interpretation - Bennett

Question 1

which measurements are seen in sagittal plane?

Answer 1

• calcaneal inclination angle
• lateral talocalcaneal angle
• talar declination angle
• first metatarsal declination angle
• inter-relationship of radiographic angles and their importance in the interpretation of biomechanical relationships associated with podiatric radiographs

Question 2

talocalcaneal angle aka

Answer 2

angle of kite

- used to evaluate flatfoot deformity

Question 3

transverse plane angular relationship of the longitudinal bisectors of talus and calcaneus

Answer 3

talocalcaneal angle

Question 4

normal talocalcaneal angle values ***

Answer 4

0-5 yo: 35-50 degrees

5- adult: 15-35 degrees

Question 5

STJ pronation ____ the talocalcaneal angle. STJ supination ______ the talocalcaneal angle

Answer 5

• increases (everted heel)

- decreases

Question 6

a measure of the most lateral surface of the cuboid and the calcaneus

Answer 6

cuboid abduction angle

- indicative of deformity in the transverse plane

Question 7

normal cuboid abduction angle

Answer 7

0-5 degrees

Question 8

pronation leads to ________ cuboid abduction angle

Answer 8

increased

Question 9

gives relative position of the forefoot to the rearfoot in the transverse plane

Answer 9

metatarsus adductus angle

- angle is composed of a bisection of the lesser tarsus and bisection of the second metatarsal

Question 10

normal metatarsus adductus

Answer 10

0-15 degrees

Question 11

metatarsus primus adductus angle

Answer 11

• representation of deviation of first met relative to second

Question 12

normal and adductus metatarssu primus adductus angle

Answer 12

normal 8-12

adductus 8-10

Question 13

evaluation of 1st intermetatarsal angle

Answer 13

• evaluation of hallux abducto valgus

- size of measurement will determine type of procedure you choose to do

Question 14

tibial sesamomid position

Answer 14

• change in sesamoid position relative to bisection of first met head
• 7 positions
• position 1-3 are normal

Question 15

representation of transverse plane position of hallux relative to long axis of the first metatarsal

Answer 15

hallux abductus angle

- quantifies the alteral deviation of the hllux in HAV

Question 16

normal hallux abductus angle

Answer 16

10-15 degrees

Question 17

hallux interphalangeal angle

Answer 17

• represents the lateral hallux deviation at the level of the IP joint
• increases in this value produce a lateral curvature of the hallux which become clinically significant

Question 18

normal hallux interphalangeal angle

Answer 18

0-10 degrees

Question 19

PASA proximal articular set angle

Answer 19

• representation of effective cartilage in relation to the shaft of the metatarsal
• bisection of met and line through articular cartilage line

Question 20

normal PASA

Answer 20

7. 5 degrees

- increase is pathological and may either add to a structural or combined deformity

Question 21

normal DASA

Answer 21

7.5 degrees

Question 22

this angle measures the relationship of the effective articulating cartilage of the base of the proximal phalanx

Answer 22

distal articular set angle DASA

Question 23

measurement difference in length b/w first and second mets

Answer 23

metatarsal protrusion distance

- impacts on the procedure one does fro bunion correction if the 1st met is short (most common)

Question 24

normal met protrusion distance

Answer 24

plus minus 2 mm

Question 25

measurement of sagittal plane position of the clacaneus referenced to the plane of support

Answer 25

calcaneal inclinationa ngle

Question 26

normal calcaneal inclination angle

Answer 26

18-21 degrees

Question 27

what decreases and what increases calcaneal inclination angle?

Answer 27

• decreased with pes plano valgus

- increased with cavus foot type

Question 28

a measurement composed of column tali axis and the plane of support

Answer 28

talar declination angle

Question 29

normal talar declination

Answer 29

21 degrees

Question 30

defined as a lazy S curve formed by the TN and CC joints

Answer 30

cyma line

Question 31

anterior vs. posterior displacement of cyma line

Answer 31

anterior - pronation

posterior - supination

Question 32

fowler-phillip angle

Answer 32

evaluation of the posterosuperior tuberosity of the calcaneus

Question 33

normal fowler-phillip angle

Answer 33

44-69 degrees

- symptoms are common when this angle exceeds 70 degrees

Question 34

evaluates for a haglund deformity

Answer 34

fowler-phillip angle

Question 35

defines the contour of the dorsal calcaneal surface

Answer 35

bohler’s angle

Question 36

normal bohler’s angle

Answer 36

25-40 degrees

- decreases with a calcaneal fracture

Question 37

angle formed by bisection of talus and first met

Answer 37

meary’s angle (talometatarsal angle)

- normal 0-10 degrees

Question 38

increases with calcaneal fracture

Answer 38

critical angle of gissane

Question 39

critical angle of gissane normal

Answer 39

120-145

- created by subchondral bone of the posterior facet and of the middle and anterior processes

Question 40

variants secondary to the structural anatomy of the 1st MPJ

Answer 40

congruous - parallel
deviated - cross outside joint
subluxed - cross inside joint
dislocated - no relationship

Question 41

shapes of 1st met head
round =
flat =
flat with ridge =

Answer 41

round - unstable, HAV
flat - stable, hallux limitus
flat w/ ridge - very stable, hallux limitus