Upper Cervical Instability
Usually this occurs between the atlas (C1) and axis (C2)
Problems may arise as a result of failure or rupture of various ligaments that contribute stability to the C1-2 complex. Other problems may arise from a neglected or missed fracture dens (known as os odontoideum)
Case Presentation
Male early twenties
Fall onto head, complaining of severe neck pain
Physical Examination findings
Severe upper cervical tenderness, pain radiating to occipital region
No neurological deficit