Rheumatoid Pannus of the Cervical Spine
Neurol 88:e51, Weerasinghe, D.,et al, 2017
Rigid Spine Syndrome and Rigid Spine Sign in Myopathies
J Child Neurol 4:273-282, Merlini,L.,et al, 1989
Atlanto-Axial Subluxation in Rheumatoid Arthritis
Bone & Joint Surg 55B:458973., Rana,N.S., 1973