Exam 2 Prep: SIJ, Cervical Spine, Thoracic Spine Flashcards
What is the function of the Uncinate processes/Joints of Luschka? Where are they located?
-C3-C7
-Prevents a vertebra from sliding backwards off the vertebra below and limits lateral flexion
-Increase the joint surface of the above segment with the lower segment
-Develop in second decade of life
-Contribute significantly to control sagittal and coronal ROM
What occurs because of uncinate process degeneration?
It is one of the chief reasons behind cervical spondylogenic changes and cervical radiculopathy
Why is coupled motion in the C/S ipsilateral?
Because of uncovertebral joints
What are unique characteristics of the discs in the C/S?
-Annulus fibrosis does not encompass the entire perimeter of the disc… no posterior annular fibers
-Fibers are arranged vertically in the cervical spine and there are no oblique fibers
What is the facet orientation in the C/S?
About 45 degrees of angulation in the frontal plane
How are the nerve roots identified in the cervical spine?
Identified by the caudal segment of the intervertebral foramen i.e. a C4-5 disc bulge would effect the C5 nerve root
How much of the foraminal space in the cervical spine does the nerve root occupy?
25-33%
Where is the vertebral artery most vulnerable to compression and stretching?
C1-C2 because of rotation
What degrees of extension and cervical rotation can reduce the lumen of the vertebral artery?
About 20 degrees of extension and 20 degrees of rotation can reduce the lumen of the vertebral artery to the point where blood flow is compromised or non-existent
What are signs and symptoms of cervical myelopathy?
-Sensory disturbances of the hands
-Muscle wasting of hand intrinsic muscles
-Hoffman’s reflex
-Hyperreflexia
-Bowel and bladder problems
-Multisegmental weakness and/or sensory changes
What are red flags for vertebral artery insufficiency or other arteries about the neck?
-Drop attacks
-Dizziness related to movement
-Dysphagia
-Dysarthria
-Diplopia
-Positive cranial nerve signs
What are the biomechanics of the cervical spine when flexing?
Superior and anterior glide of the superior articulating surface on the inferior articulating surface bilaterally
What are the biomechanics of the cervical spine when extending?
Inferior and posterior glide bilaterally
What are the biomechanics of the cervical spine when rotating?
-Superior and anterior glide of the superior facet on one side and inferior and posterior glide on the opposite side
-Ex: left rotation=superior and anterior glide of the R facet and inferior and posterior glide of the L facet
How much motion does the upper cervical spine contribute?
-60% of rotation
-40% of flexion/extension
-45% of overall neck motion
What is the function of the alar ligament?
-Protects normal craniovertebral motion
-When rotating, the contralateral alar ligament is taut
-Limits flexion, contralateral rotation and side bending
-Connects the superior part of the dens to the fossa on the medial side of the occipital condyles
What is the main function of the OA joint?
-Occipital-atlanto joint
-Occipital condyles and superior articulating facets of the atlas slope downward and medially to promote upper cervical extension
What is coupled motion in the upper cervical spine?
Side bending and rotation are always opposite
Which scaleni muscles attach to the 1st rib?
Anterior and middle
Which scaleni muscles attach to the 2nd rib?
Posterior scalene
What are the arthrokinematics at the OA joint?
-Flexion: posterior glide of occipital condyles
-Extension: anterior glide of occipital condyles
What is an important restraint of craniovertebral flexion? What is it?
-Tectorial membrane
-Broad band that covers the odontoid process
What happens to the disc between C1 and C2? What happens if the natural process for this disc does not occur?
-There is no disc as it gets absorbed into the body of C2
-If this does not occur, it is called os odontoideum
What are the joint surfaces of the AA joint like?
2 slightly convex surfaces