Journal of Bone and Joint Surgery, 1971;53:663-670.
© 1971 by The Journal of Bone and Joint Surgery, Inc
The Traction Spur
AN INDICATOR OF SEGMENTAL INSTABILITY
IAN MACNAB M.B., CH. B., F.R.C.S. (ENG.), F.R.C.S. (C)1
1 From the Division of Orthopaedic Surgery, The Wellesley Hospital, Toronto
The traction spur differs from all other spondylophytes in that it is horizontally directed and arises at the site of attachment of the outermost annular fibers about two millimeters away from the discal border of the anterior and lateral surfaces of vertebral bodies. The significance of a traction spur lies in the fact that it denotes segmental instability which may or may not cause symptoms.