. Radiography, X-ray therapeutics and radium therapy . 127.—Normal shoulder-joint showing condition of epiphysesat the head of humerus. in length of the humerus takes place principally at this epiphysis, andhence its great importance. Certain anatomical facts are worthy of note when we are considering inflammatory conditions andinjuries of the bones in theneighbourhood of joints, moreespecially in children andyoung adults. It is importantto keep in mind the chiefcentres of ossification and theperiods at which the epiphysesjoin the diaphyses in the jointsmost liable to injury ; but asit is obvi
. Radiography, X-ray therapeutics and radium therapy . 127.—Normal shoulder-joint showing condition of epiphysesat the head of humerus. in length of the humerus takes place principally at this epiphysis, andhence its great importance. Certain anatomical facts are worthy of note when we are considering inflammatory conditions andinjuries of the bones in theneighbourhood of joints, moreespecially in children andyoung adults. It is importantto keep in mind the chiefcentres of ossification and theperiods at which the epiphysesjoin the diaphyses in the jointsmost liable to injury ; but asit is obvious that one cannotreadily recall the whole ofthem it is hoped that a refer-ence to the foregoing pageswill be helpful. The markeddifferences between the appear-ances of joints in early youthand in adult life must be noted to avoid errors in diagnosis. Fracturesare relatively more frequent in adults, while greenstick fracture andseparation of epiphyses are more prevalent in injuries occurring before theepiphyses have joined up with the Fig. 128.—Shoulder-joint, showing epiphyseal for head and great tuberosity have joined. Thereis evidence of a partial fracture at the surgical neck. SESAMOID BONES 153 The after history of an injury is greatly influenced in its results when theinjury occurs in the neighbourhood of the epiphyseal line. Arrested develop-ment is a frequent result of such an injury. There are, therefore, certainpoints which should be remembered in relation to the principal joints of thebody which will be briefly mentioned, reference to figures illustrating thesepoints being made as occasion arises. Sesamoid Bones.—These are small rounded masses, cartilaginous inearly life, osseous in the adult, which are developed in tendons whichexert a great amount of pressure upon those parts over which they is said that they are more commonly found in the male than in thefemale, and in persons of an active muscular habit than in those whoar
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