Astragalus
For the Fincastle Project, Bone Units 18 and 19 were added.
BU 1
SC A
Complete element.
BU 12
SC B
Element missing medial ridge at distal trochlea.
BU 14
SC C
Unit is essentially element, with the exception of a missing distal trochlear surface. Opposite of BU 17. (WU)
BU 16
SC D
Unit is essentially complete, with the exception of a missing medial ridge of the proximal trochlea. Opposite of BU 3. (WU)
BU 6
SC E
Element with all or major portion of lateral ridge of proximal trochlea removed. All or most of medial ridge of proximal trochlea present. Defined Oct 29/86
BU 11
SC F
Element with distal trochlear surface on posterior side missing. Anterior surface remains. (WU)
BU 7
SC G
Proximal ½ - 2/3 of element. Opposite of BU 2. (AL)
BU 2
SC H
Consists of distal ½ - 2/3 of element.
BU 8
SC I
Lateral half of astragalus. (DS)
BU 9
SC J
Medial half of astragalus. (DS)
BU 10
SC K
Posterior half of astragalus. (WU)
BU 13
SC L
Anterior half of element.
BU 15
SC M
Unit consists of a limited portion of the anterior surface. Similar to BU 13. (TVH)
BU 17
SC N
Unit consists of a fragment of the distal lateral trochlear surface. (TVH)
BU 5
SC O
All or a portion of the medial ridge of the distal trochlea.
BU 4
SC P
All or a portion of the lateral ridge of the proximal trochlea.
BU 3
SC Q
All or a portion of the medial ridge of proximal trochlea.
BU 18
SC R
Fragment of the calcaneum facet on posterior side. (SB)
BU 19
SC S
Fragment identified by curvature or shape. (SB)