Cervical and Thoracic Spine Flashcards
how does shape of disc allow for its fxn?
- oblique angles: alllow for rotation and integrity of disc
- discs are extremely strong in compression but not in shear force (sliding force)
Where does the spinal cord stop?
- around L1, doesn’t go below L2
Impt rules about nerve root nomenclature of the spine?
- nerve root exits above pedicle w/ same number in cervical spine (C1 exits below occiput and C1)
- C8 root exits above T1 pedicle
- nerve root exits below pedicle w/ same number in thoracic and lumbar spine (T1 below T1 vertebrae)
lumbar disc protrusion at disc L4-L5 affects what nerve?
- lumbar disc protrusion doesn’t usually affect nerve exiting above disc, lateral protrusion at disc level L4-5 affects 5th lumbar nerve, not 4th lumbar nerve. Protrusion at disc L5-S1 affects 1st sacral nerve
Most mobile parts of vertebrae? Orientation of spine?
- cervical and lumbar (see a lot more fracutres and DDD here)
- Cervical: 50% ROM C1-C2, 50% b/t occiput and C1, 10% per subaxial level
- thoracic: rib cage and facet orientation keep it fixed
- becomes more vertical throughout (cervical to lumbar)
How is axial pain generated? Where are these located?
- this is controversial: discogenic pain
- pain fibers located in:
annulus
jt: uncovertebral, facet
ligaments
periosteum
muscle/fascia
How is radicular pain generated? Assoc w/?
- nerve root mediated: compression chemical/inflammatory - dermatomal sharp pain, numbness, parasthesia - assoc w/ weakness, hyporeflexia - diff pathway than pain fibers
Describe referred pain?
- axial or external pain localized to a site remote from location of nocioreceptors
- probably activation of contiguous cerebral cortex
- dull, achy, nondermatomal pain
- assoc w/ axial pain (doesn’t radiate into extremities)
PP of normal aging?
- results in a degenerative cascade that may result in a pathologic state
- intervertebral disc biologic aging triggers the degenerative cascade (degenerative changes don’t always cause pain)
Make up of intervertebral disc - throughout life?
- nucleus is metabolically active, hydrostatic proteoglycans, shock absorber effect
- nucleus is vascular in childhood via annular arteries
- beginning at adolescence nutrition is via diffusion only
- proteoglycans degenerate, lose H2O content (dehydrate)
- alters biomechanical properties of the disc and the motion segment: loss of shock absorber
Normal aging affect on intervertebral discs?
- everyone ages diff (stress, trauma)
- disc dehydration, disc narrowing
- increase strain on annulus:
diffuse bulging annulus, annulur tears, focal disc herniation - stress transfer to uncovertebral and facet jts:
arthrosis (bone spurs), stiffness
instability - most degenerative changes are asx or mildly sx
How common is axial pain? Presentation?
- up to 50% of people have some neck pain: intermittant, mild or occasionally severe
- facet, uncovertebral jt arthritis
- loss of lordosis resulting in muscular pain
- instability
- discogenic pain (hard to track)
How common is neurogenic pain? Diff types?
- 10-15% of people will have at least 1 episode of cervical neurogenic pain
- radiculopathy: pressure related nerve root dysfxn:
- disc herniation,
- uncoverterbal, facet jt spurs
- myelopathy: pressure related spinal cord dysfxn:
large disc herniation
spurs
congenitally narrow canal
Nucleus is bulging out and compressing spinal cord - what should you expect?
- myelopathy
nucleus is bulging out and compressing a nerve root - what should you expect?
- radiculopathy
