forensic anthropology bones of the leg. skeletal anatomy of the leg comprised of 4 bones femur femur...
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Forensic Anthropology
Bones of the Leg
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Skeletal anatomy of the legComprised of 4
bones Femur Tibia Fibula Patella
Useful for age/growth Sex determination stature
determination
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THE FEMUR Largest, heaviest bone of the body
Ball shaped head
Articulates with innominate, tibia (does NOT form a straight line with tibia in anatomical position), patella
Shaft has circular cross section
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THE FEMUR – what to know
Proximally Head Fovea capitus Anatomical neck Greater and lesser
trochanter Intertrochanteric crest Linea aspera
Distally Lateral condyle Lateral epicondyle Medial epicondyle Medial condyle Intercondylar fossa Patellar articular surface
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THE FEMUR – L from R
Orient head medially, greater trochanter
Intercondylar fossa posterior
Larger condyle is medial
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The tibia - description
Second largest bone in the body Hinge joint – greatest weight bearing Articulations:
• Proximal – femur at horizontal platform AND fibula• Distal – fibula AND talus• Note there is NO articulation with the patella
Shape = triangular shaft• Sharpest angle anterior• Malleolus at distal end
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The tibia – What to know Proximal end:
Intercondylar eminence
Medial condyle Lateral condyle Tibial tuberosity Fibular facet of tibia
Popliteal line Interosseous crest Anterior crest
Distal end: Fibular notch of tibia Articular surface for
talus Medial malleolus
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Tibia – Right from left Orient plateau superiorly
Make sure tibial tuberosity is anterior Medial malleolus is medial
Interosseous crest points toward fibula
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Growth and the humerus
Fusion ages ♀14-16/ ♂15-18 distal epiphysis ♀13-17/ ♂15-19 proximal epiphysis
Also age related changes in bone density associated with elderly
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The fibula - description
Lateral to the tibia, most slender long bone
Makes up the ‘outside’ of the ankle
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The fibula Shaft – triangular X-section
Flat head at top Distal end composed largely of lateral malleolus
Articulations• Proximal – with tibia at fibular facet just below lateral
condyle • Distal – passes through fibular notch of tibia to
articulate with talus
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The fibula – What to know
Proximal End: Head Styloid process Facet for tibia
Interosseous crest
Distal End: Lateral malleolus Malleolar facet for
talus Malleolar fossa
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fibula – Right from left
Orient head superior
Lateral malleolus is lateral, tip points posteriorly (when looking at lateral side)
Styloid process and interosseous crest
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Bones of the hand
Carpal bones
1. scaphoid
2. lunate
3. triquetrum
4. pisiform
5. trapezium
6. trapezoid
7. capitate
8. hamate
Metacarpal bones
9. I
10. II
11. III
12. IV
13. V
Phalanges
proximal 14
middle 15
distal 16
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Sorting metatarsals
Longer, thinner, and more curved than MC MT1: thickest MT2: Longest, slight process
Triangular with off-set lateral facet MT3: triangular with continuous lateral facet MT4: base rectangular MT5: long, lateral process
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Bones of the Foot
1. Calcaneus
2. Talus
3. Navicular
4. Medial cuneiform
5. Intermediate
cuneiform
6. Lateral cuneiform
7. Cuboid
8. First metatarsal
9. Second metatarsal
10. Third metatarsal
11. Fourth metatarsal
12. Fifth metatarsal
13. Proximal phalanx of
great toe
14. Distal phalanx of
great toe
15. Proximal phalanx of
second toe
16. Middle phalanx of
second toe
17. Distal phalanx of
second toe
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Sorting metacarpals
MC1: shortest, thickest
MC2: longest, 2 processes at base M2 – M5 decrease in size successively
MC3: 1 processes at base MC4: no processes, facets on both sides
of base MC5: short, no processes, facet on only
1 side of base
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Manual vs pedal phalanges Manual phalanges are longer Flattened in the middle (oval cross-
section) Narrower top to bottom
Pedal phalanges are ‘slim-waisted’ in the middle
Circular cross-section Narrower side to side
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Sorting phalanges
Proximal phalanges: cup-shaped proximal end (art. w/ MC head)
Medial phalanges: double-faceted proximal end
Distal phalanges: flat, ‘fingernail shaped’ distal end
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