Atlantoaxial rotatory subluxation is a condition where there is a fixed rotation of C1 over C2. This condition occurs when normal motion between the atlas and axis becomes limited or fixed either spontaneously or following minor trauma [which usually is the case]. It can also or follow an upper respiratory tract infection.
The cause of this subluxation is not completely understood. It is related to increased laxity of ligaments and capsular structures caused by inflammation or trauma.
Atlantoaxial rotatory subluxation is a common cause of childhood torticollis. Both the subluxation and torticollis usually are temporary. but rarely they persist and become atlantoaxial rotatory fixation. [Read more...]