求翻译：上位锁骨内二分之一段发育正常，内端和胸骨柄的锁切迹形成胸锁关节，外二分之一段发育不良，直径约为内侧段的二分之一左右，但髓腔和周缘的皮质发育完整，外侧端游离是什么意思？

Two thirds of the upper clavicle normal period of development, the inner end of the locking notch of the sternal formation of the sternoclavicular joint, the outer two thirds section of dysplasia with a diameter of about half of the medial segment, but the canal and the margin of cortical developmen

The clavicle, one of 2 sub-paragraph development in normal and manubrium port and all traces of the sternoclavicular joint, a 2 out of a stunted, inside diameter is approximately 2 minutes of the paragraph about one of the bone marrow cavity, and the cortical development and the outer end complete f

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Between clavicle one-second normal, in the end and the manubrium sterni sternoclavicular notch formation of locks, one-second dysplasia outside, inside diameter of about one-second around, but the Medullary cavity and its surrounding cortex full, lateral side of free

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