Facet injuries most commonly occur in which two segments of the cervical spine?

• A. C1/C2 and C3/C4
• B. C4/C5 and C5/C6
• C. C2/C3 and C6/C7
• D. C3/C4 and C5/C6

Answer: (B)

Facet injuries in the cervical spine occur most frequently in the segments where the combination of high mobility and anatomical vulnerability exists. The C4/C5 and C5/C6 segments are particularly prone to these injuries due to their location in the mid-cervical region, which is characterized by significant range of motion during various activities, including rotation and flexion.

The C4/C5 segment is often involved in injuries because it bears a considerable amount of mechanical stress during motions like twisting and bending, while the C5/C6 segment is similarly vulnerable due to its dynamic role in stabilizing the head and neck. Additionally, these levels are often affected in cases of whiplash injuries or trauma, further contributing to the higher incidence of facet joint injuries.

Understanding the mechanics of the cervical spine reveals that these segments are commonly subjected to stress and strain, leading to a higher prevalence of facet injuries compared to other cervical segments.