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The clavicle, an “S”-shaped bone, is the only long bone that ossifies by an intramembranous process. It is the first bone in the body to ossify (fifth week of fetal gestation) and is the last bone to fuse (medial epiphysis at 25 years of age). The clavicle consists of cancellous bone surrounded by an outer […]



Basics Description Achondroplasia is the most common skeletal dysplasia. Characteristics: Patient height <4.5 feet at maturity The greatest shortening occurs in the proximal humerus and femur . Hypoplasia of the midface and frontal bossing may be present. Arthritis is rarely seen, but spinal stenosis is the most serious possible complication. Affects the skeletal […]