. Radiography and radio-therapeutics . es of the bonesin the neighbourhood ofjoints, more especially inchildren and youngadults. It is importantto keep in mind the chiefcentres of ossification andthe periods at which the epiphyses join the diaphyses in the joints mostliable to injury ; but as it is obvious that one cannot readily recall thewhole of them it is hopedthat a reference to theforegoing pages will behelpful. The markeddifferences between theappearances of joints inearly youth and in adultlife must be notedavoid errors in diagnosis. SjSFractures are relativelymore frequent in adults,w
. Radiography and radio-therapeutics . es of the bonesin the neighbourhood ofjoints, more especially inchildren and youngadults. It is importantto keep in mind the chiefcentres of ossification andthe periods at which the epiphyses join the diaphyses in the joints mostliable to injury ; but as it is obvious that one cannot readily recall thewhole of them it is hopedthat a reference to theforegoing pages will behelpful. The markeddifferences between theappearances of joints inearly youth and in adultlife must be notedavoid errors in diagnosis. SjSFractures are relativelymore frequent in adults,while greenstick fractureand separation of epi-physes are more preva-lent in injuries occurringbefore the epiphyses havejoined up with the dia-physes. The after history ofan injury is greatly influ-enced in its results when the injury occurs in the neighbourhood of theepiphyseal line. Arrested development is a frequent result of suchan injury. There are, therefore, certain points which should be X/0 EPPhyses of head&tubercles blend. Fig. 204.—Diagram to show bones entering into the shoulder-joint. The clavicle has not been included. SESAMOID BONES 235 remembered in relation to the principal joints of the body which will be briefly mentioned, reference to figures illustrating these points being made as occasion arises. Sesamoid Bones.—These are small roundedmasses, cartilaginous inearly life, osseous in theadult, which are devel-oped in tendons whichexert a great amountof pressure upon thoseparts over which theyglide. It is said thatthey are more com-monly found in themale than in the female,and in persons of anactive muscular habitthan in those who areweak and debilitated. They have a free articular facet. The sesamoid bones of the joints in the lower extremity are : the patella
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