Anterior posterior view relationships

Anterior posterior view relationships:
Talocalcaneal angle:
Angle formed by intersection of collum tali axis and longitudinal axis of rearfoot. Normally 17-21 degrees. Increases with STJ pronation and decreases with STJ supination.

Cuboid abduction angle:
Angle formed by a bisection of the lateral aspect of the cuboid and the longitudinal axis of the rearfoot. Normally 0 to 5 degrees.

Metatarsus adductus angle (MAA):
Angle formed by a bisection of the longitudinal axis of the metatarsus and the longitudinal axis of the lessor tarsus. Normally 16-18 degrees adducted; if < 15 degrees, the foot is considered rectus; if > 18-19 degrees  metatarsus adductus.

Intermetatarsal angle/metatarsus primus angle (IMA):
Angle formed by the bisection of the longitudinal axes of the first and second metatarsal. Normally about 8 to 12 degrees.

Hallux abductus angle:
Angle formed by the bisection of the longitudinal axis of the first metatarsal and the longitudinal axis of the proximal phalanx of the hallux. Normally about 10-15 degrees.

Hallux interphalangeal angle:
Angle formed by a bisection of the longitudinal axis of the proximal phalanx and the distal phalanx of the hallux.

Proximal articular set angle (PASA):
Angle between the longitudinal bisection of the first metatarsal and a transverse line connecting the medial and lateral extents of the articular surface of the first metatarsal heads. Used for evaluation of structural deformities of the first metatarsal head.

Distal articular set angle (DASA):
Angle between the longitudinal bisection of the proximal phalanx and a transverse line connecting the medial and lateral extents of the articular surface of the base of the proximal phalanx. Used for the evaluation of structural deformities of the base of the proximal phalanx.

Tibial Sesamoid position:
Position of tibial sesamoid relative to the long axis of the first metatarsal. Seven possible positions:
1) Sesamoid is medial to axis
2) Sesamoid is touching the axis (laterally)
3) Sesamoid overlaps the axis (laterally)
4) Sesamoid is bisected by the axis
5) Sesamoid overlaps the axis (medially)
6) Sesamoid is touching the axis (medially)
7) Sesamoid is lateral to the axis

Metatarsal protrusion:
Uses bisection of first and second metatarsals. Arcs are drawn from where the lines intersect and relative protrusions of the two metatarsals are measured.

(Include angle from McPoil in Munich)

Cyma line:

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