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atlantoaxial subluxation Partial dislocation caused by instability of the first cervical vertebra (the atlas) and second cervical vertebra (the axis). The lack of stability causes compression of the spinal cord that results in pain and/or paralysis. This condition can be caused by trauma in any dog, but is more often seen as either a congenital or developmental malformation in small breeds. ►click here to learn more-link provided by: University of Pennsylvania, School of Veterinary Medicine Related Words atlantoaxial  ;  atlas  ;  axis  ;  cervical  ;  congenital  ;  paralysis  ;  spinal cord  ;  subluxation  ;  trauma  ;  vertebra