This document lists ages for the ossification and fusion of various bones in the human skeletal system. Key bones mentioned include: - Clavicle: Ossification begins at the medial end between 18-20 years and the lateral end between 22-23 years. - Scapula: Ossification of the acromion and coracoid process begins around 14 years of age. - Pelvis: The triradiate cartilage begins to ossify between 4-5 months in utero and fuses between 6-7 months. - Femur: Ossification begins in the head around 1 year of age and the distal end around 9 months in utero. -

1. CLAVICLE
Medial end
18-20 Yrs
22-23 Yrs

2. 6 m IU
7 m IU
9 m IU
60 Yrs
40 Yrs
STERNUM

3. acromion
coracoid
14 Yr
18 Yr
SCAPULA

4. head
greater
lesser
tuberosity
1 Yr
3 Yr
5 Yr
6 Yr
(16-18Yr)
capitulum
trochlea
Lateral epicondyle
13 Yr
11 Yr
2 Yr
14Yr
(14-17Yr)
Medial epicondyle
8 Yr

5. Upper end -radius
Lower end -radius
6 Yr
2 Yr 6 Yr
10 Yr
Upper end -ulna
Lower end -ulna
RADIUS AND ULNA
(14-17Yr)
(14-18Yr)

6. P
TQ
LS
CTM
H
TD
1- capitate
2-hamate
3-triquetral
4-lunate
5-trapezoid
5-scaphoid
6-trapezium
11-12-pisciform
CARPAL BONES
2
2-4
2-4
2-4
2-4 14-17 Yr

7. 14 yr (18 yr)
(11-14 yr)
(7-8 yr)
16 yr
(19 yr-F)
(21 yr -M)
PELVIS
Triradiate cartliage
Ilia crest
Ischial tuberosity
Ischiopubic ramus

9. 4-5 m IU
6-7 m IU
I
II
III
IV
V 8m IU (14 Yr)
(20-25) Yr
SACRUM

10. Head
Lower end of femur
1 yr
4 yr
11 yr
9 m IU
(15 yr)
(14- 17 yr)
(14- 17 yr)
(14- 17 yr)
FEMUR
Greater trochanter
Lesser trochanter

11. Upper end -Tibia
Lower end -Tibia
Just after birth
(14-17 yr)
2 yr
(14-17 yr)
4 yr
Upper end -Fibula
Lower end -Fibula
TIBIA AND FIBULA

12. (14-17 Yr)
TARSAL BONES
Calcaneum
5 m IU
Talus
7 m IU
Cuboid
9 m IU

13. 40-50 50
30-40
40-50
50-60
50-60
60-70
40-50
80
Cranial Sutures