Summary of Ossification Patterns
BONE OSSIFICATION CENTER AGE AT APPEARANCE AGE AT FUSION
Scapula Body (primary) 8 wk (fetal)
Coracoid (tip) 1 yr
Coracoid 15 yr
Acromion 15 yr
Acromion 16 yr
Inferior angle 16 yr
Medial border 16 yr
Clavicle Medial (primary) 5 wk (fetal) 25 yr
Lateral (primary) 5 wk (fetal)
Sternal 19 yr
Humerus Body (primary) 8 wk (fetal) Blends at 6 yr and unites at 20 yr
Head 1 yr
Greater tuberosity 3 yr
Lesser tuberosity 5 yr
Capitellum 2 yr Blends and unites with body at 16-18 yr
Medial epicondyles 5 yr
Trochlea 9 yr
Lateral epicondyles 13 yr
Ulna Body (primary) 8 wk (fetal)
Distal ulna 5 yr 20 yr
Olecranon 10 yr 16 yr
Radius Body (primary) 8 wk (fetal)
Distal radius 2 yr 17-20 yr
Proximal radius 5 yr 15-18 yr
Pelvis Ilium (primary) 2 mo 15 yr
Ischium (primary) 4 mo 15 yr
Pubis (primary) 6 mo 15 yr
Acetabulum 12 yr 15 yr
Tibia Body (primary) 7 wk (fetal)
Proximal (secondary) Birth 20 yr
Distal (secondary) 2 yr 18 yr
Fibula Body (primary) 8 wk (fetal)
Proximal (secondary) 3 yr 25 yr
Distal (secondary) 2 yr 20 yr