What does the alar ligament do?
What does the alar ligament do?
They are paired ligaments that are very strong and limit axial rotation and contralateral lateral flexion of the head. In conjunction with the transverse band of the cruciform ligament, they are the primary stabilizers of the atlantoaxial joint 2.
What do the alar ligaments stabilize?
The alar ligament is one of the two strongest ligaments stabilizing the craniocervical junction.
What is apical ligament?
The apical ligament is a small ligament that joins the apex (tip) of the dens of C2 to the anterior margin (basion) of the foramen magnum. It is the weak, fibrous remnant of the notochord and does not contribute significantly to stability.
Which ligament allows for dens rotation?
Alar ligament
Because of their function, the alar ligaments are also known as the “check ligaments of the odontoid”….
| Alar ligament | |
|---|---|
| From | Sides of the dens (on the axis, or the second cervical vertebra) |
| To | Tubercles on the medial side of the occipital condyle |
| Identifiers |
Can neck ligaments heal?
Neck sprains, like other sprains, will usually heal gradually, given time and appropriate treatment. You may have to wear a soft collar around your neck to help support the head and relieve pressure on the ligaments so they have time to heal.
How do you fix a torn ligament in your neck?
The recommended treatment for sprains and strains, wherever they are located in the body, is similar: rest, ice, compression and elevation, followed by simple exercises to relieve pain and restore mobility. Neck sprains and strains typically heal gradually over time, with appropriate treatment.
Where is the apical ligament located?
We have found that the apical ligament originates from just anterior to the tip of the odontoid and usually from a small coronal groove located there. The ligament was observed to be inserted into the anterior rim of the foramen magnum at the basion just superior to the condylus tertius.
Is the apical ligament?
What does the transverse ligament limit?
The transverse ligament prevents the odontoid process from being displaced backwards.
What happens if the transverse ligament is ruptured?
A transverse ligament tear increases the flexion angle of the head and the vertebrae as well as the atlas–dens interval. The atlas–dens interval reaches a critical value when the compressive loading exceeds 40 N.
Is the dens on C1 or C2?
The C1 vertebra, also called atlas, is shaped like a ring. The C2 vertebra has an upward-facing long bony process called the dens. The dens forms a joint with the C1 vertebra and facilitates its turning motions, thereby allowing the head to turn in different directions.
Where does the angle of the alar ligament come from?
They span almost horizontally, creating an angle between them of at least 140°. The alar ligaments, along with the transverse ligament of the atlas, derive from the axial component of the first cervical sclerotome.
Why are the alar ligaments not found to be unstable?
This finding indicates that within the ranges in which these ligaments were tested, a bilateral effect on the alar ligaments is not evident and the need for a finding of laxity in both directions is not necessary to infer instability. In the following video you can see the maneuver in sitting position:
What is the rotation test for the alar ligament?
Rotational. The rotation stress test is regarded as primarily stressing the contralateral alar ligament in accordance with the biomechanical description of Dvorak et al. Again, the test is described for both sitting and supine positions. The axis is stabilized around its laminae and spinous process using a lumbrical grip.
How can you tell if you have an alar ligament injury?
Absence of the spinous process moving to the opposite side may indicate alar ligament injury. If you block the spinous process of C2 from moving, you may stress the ligament. You should encounter a firm end-feel in this case.