Research Article

Rheumatoid Arthritis Affecting the Upper Cervical Spine: Biomechanical Assessment of the Stabilizing Ligaments

Table 1

Diameter of AADI and PADI measured in mm at neutral position, flexion, and extension: measurements were carried out in intact specimens and after the transverse and the alar ligaments were damaged.

Neutral position Flexion Extension
AverageMinimumMaximumAverageMinimumMaximumAverageMinimumMaximum

PADIIntact18.8517.5720.8618.4915.4622.8918.9115.8123.02
Transverse lig. cut18.6015.7022.0016.2012.9720.6917.3013.7321.75
Alar lig. cut18.0115.7422.1114.0011.5716.4018.5014.6123.15
AADIIntact1.620.652.331.880.902.911.630.782.33
Transverse lig. cut2.191.803.182.531.553.922.231.542.84
Alar lig. cut2.591.743.815.473.756.992.532.023.38