Radiographic biomechanical interpretation of foot Flashcards

1
Q

Nl metatarsal protrusion distance

A

+/- 2mm

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2
Q

Cuboid abduction angle

A

a measure of the most lateral surface of cuboid and calcaneus, indicative of deformity in transverse plane

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3
Q

Talocalcaneal angle

A

angle of kite, measure of transverse plane anglular relationship of longitudinal bisectors of talus and calcaneus

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4
Q

Nl Bohler’s angle

A

25-40, decreases with a calcaneal fx

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5
Q

Talar declination angle

A

measurement composed of column tali axis and plane of support

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6
Q

1st MPJ structure and position

A

variants secondary to the structural anatomy of 1st MPJ, see pic for different positions

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7
Q

Cyma line

A

defined as a lazy S curve formed by the T-N and C-C joints (chopart’s joint)

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8
Q

Shapes of 1st met head

A

round: unstable, HAV flat: stable, hallux limitus Flat with ridge: very stable, hallux limitus

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9
Q

Nl PASA

A

7.5 degrees

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10
Q

Different Tibial sesamoid position

A

7 positions, nl is position 1-3

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11
Q

Nl Hallux IP angle

A

0-10

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12
Q

Nl metatarsus adductus angle

A

0-15

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13
Q

Bohler’s angle

A

defines contour of dorsal surface of calcaneus

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14
Q

Metatarsus primus adductus angle

A

also called 1st intermetatarsal angle, representation of deviation of first met relative to second met, bisect the first and bisect the second met, evaluation of hallux abducto valgus-will determine what type of procedure

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15
Q

nl and adductus angles of metatarsus primus adductus angle

A

nl: 8-12 degrees adductus: 8-10 degrees

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16
Q

Talometatarsal angle

A

Meary’s angle, angle formed by bisection of talus and first met

17
Q

Proximal articular set angle (PASA)

A

representation of effective cartilage in relation to shaft of met, any increase in PASA is pathological and may either add to a structural or combined deformity

18
Q

Nl calcaneal inclination angle

A

18-21 degrees, decreased with pes plano valgus, increased with cavus foot type

19
Q

Nl Talar declination angle

A

21 degrees

20
Q

Nl hallux abductus angle

A

10-15 degrees

21
Q

Distal articular set angle (DASA)

A

measures relationship of effective articulating cartilage of base of proximal phalanx

22
Q

Nl talocalcaneal angles

A

0-5: 35-50 degrees, 5-adult: 15-35 degrees

23
Q

nl DASA

A

7.5

24
Q

nl talometatarsal angle

A

0-10 degrees

25
Q

Critical angle of Gissane

A

created by subchondral bone of posterior facet and of middle and anterior processes of calcaneus (downward and upward slopes of calcaneus superior surface)

26
Q

Metatarsal protrusion distance

A

measurement in difference in length between 1st and 2nd mets, impacts on procedure one does for bunion correction if the 1st met is short (most common)

27
Q

Nl Fowler-Phillip Angle

A

44-69, sx are common when greater than 75

28
Q

Displacements of Cyma line

A

anterior: pronation, posterior: supination

29
Q

nl critical angle of gissane

A

120-145, increases with calcaneal fx

30
Q

Transverse plane vs sagittal plane

A

Seen on AP, seen on lateral

31
Q

angle of cuboid abduction angle

A

nl 0-5 degrees, pronation results in increased abduction

32
Q

Metatarsus adductus angle

A

gives relative position of forefoot to the rearfoot in transverse plane, composed of a bisection of lesser tarsus and bisection of second met

33
Q

Calcaneal inclination angle

A

sagittal plane position of calcaneus referenced to plane of support

34
Q

Hallux interphalangeal angle

A

represents lateral hallux deviation at IPJ, increases in this value produce a lateral curvature of hallux which become clinically significant

35
Q

Tibial sesamoid position

A

change in sesamoid position occurs relative to first met head, TSP is measured relative to bisection of 1st met

36
Q

Hallux abductus angle

A

representation of transverse plane position of hallux relative to long axis of first met, quantifies the lateral deviation of the hallux in HAV

37
Q

Fowler Phillip Angle

A

evaluation of posterosuperior surface and ifnerior surface of the calcaneus, evaluates for Haglund deformity

38
Q

How to get talocalcaneal angle

A

long axis of calcaneus and bisect the talus

39
Q

What is the talocalcaneal angle used for?

A

evaluate flatfoot deformity, increased with STJ pronation: everted heel, decreased in STJ supination