Habitual dislocation - Habitual dislocation

Japanese: 習慣性脱臼 - しゅうかんせいだっきゅう

This refers to a joint that is easily dislocated by an external force that does not normally occur. More accurately, it should be called recurrent dislocation, but is usually called habitual dislocation. Habitual dislocations occur in the shoulder, jaw, and knee joints, but the most common is the shoulder joint. Dislocations often occur when the upper limb is raised and externally rotated (as when serving in tennis). Once a traumatic shoulder dislocation occurs after a fall, the likelihood of dislocating again is said to be 70%, making it more likely to become habitual.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ふつうでは起こらない程度の外力で容易に脱臼するものをいい，正確には反復性脱臼というべきところを通常，習慣性脱臼と呼んでいる。習慣性脱臼が生ずるのは肩，あご，ひざの関節であるが，最も多いのが肩関節である。上肢を挙上，外旋して(テニスでサーブする際のような形)脱臼することが多い。転んだりして一度外傷性肩関節脱臼を生ずると，そのあとでもう一度以上脱臼を起こす可能性は70％といわれるくらい脱臼しやすくなる，つまり習慣性となりやすい。

出典　株式会社平凡社世界大百科事典第２版について　情報

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