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Humerus 6-8 weeks

Radius 6-12 weeks Ulna 6-8 weeks

Metacarpals 2-4 mo, Phalanges 2-6 mo

Humerus 6-8 weeks

Radius 6-12 weeks Ulna 6-8 weeks

Metacarpals 2-4 mo, Phalanges 2-6 mo

Figure 13.2 Fetal ossification centers. From Lowrey (1986), by permission.

Femur 6-12 weeks

Secondary center 6-10 fetal mo. Secondary center 8th fetal-lst

Tibia 6-12 weeks P°staatalm°-Fibula 6-10 weeks

Talus 4-8 mo. Calcaneus 4th-7th mo.

Metatarsals 2-4 mo. Phalanges 2-4 mo.

Figure 13.2 Fetal ossification centers. From Lowrey (1986), by permission.

Comparison with established standards It is necessary to have the standard illustration present in the books by Greulich and Pyle (1959) and by Pyle and Hoerr (1969) to evaluate the shape and growth of phalangeal and knee epiphyses. By comparison with these standards, one arrives at a "best match" and establishes the bone age for the child.

Fig. 13.3a Appearance time of ossification centers in the newborn (both sexes) in weeks of gestation

Center

Humeral head epiphyses Distal femoral epiphysis

Proximal tibial epiphysis

Calcaneus Talus

Cuboid

First seen

5%

50%

95%

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