Lumbar Flashcards
How many facet joints in lumbar spinal segments?
Five pairs
Apophyseal or zyoapophyseal (facet)
What direction do lubar facets face?
Superior: medial and posterior
Inferior: lateral and anterior
Which movements are limited by facet joints
Side flexion
Flexion
Extension
Relationship between lumbar TVPs and SPs
Same level
Lumbar joints: Capsular pattern
Side flexion = rotation, then extension
Degrees of AROM: lumbar flexion
40-60º
Degrees of AROM: lumbar extension
20-35º
Degrees of AROM: lumbar lateral flexion
15-20º
Degrees of AROM: Rotation
2-18º
Lumbar: IL side flexion increases pain; no radicular symptoms
Problem probably intra-articular (since muscles and ligaments relaxed)
Lumbar: IL side flexion increases pain and radicular symptoms
Likely disc protrusion lateral to nerve root
Lumbar: CL side flexion increases pain and radicular symptoms
Likely disc protrusion medial to nerve root
Lumbar: coupled movements
side flexion + rotation
Ligament unique to lumbar spine
Iliolumbar ligament
TVP of L5 to posterior ilium
Stabilizes L5, prevents anterior displacement
Commonly injured with flexion + twisting
Anterior longitudinal ligament
Occiput –> sacrum
Strongest ligament in body
Prevents hyperextension
Posterior longitudinal ligament
Occiput to sacrum
Anterior aspect of neural canal
Attaches to IVD but not vertebral bodies
Limits forward bending
Ligamentum flavum
Ant-inf border of superior lamina –> posterior border of inferior lamina
C2 –> S1
Most elastic tissue in the body
Prevents meninsci and synovial lining from being caught in articular joint surfaces
Intertransverse Ligaments
Limit lateral flexion and rotation
Interspinous ligaments
Go up and backwards, not up and forwards
–> allow for flexion but within control
Supraspinous ligaments
Connect aspices of spines C7-L4
Most superficial, most likely to sprain
Nuchal Ligament
Supraspinous ligament from C7–> occiput
Lumbar: Each nerve root is named for …
The vertebra above it.
Thoracic: same; Cervical: named for below
Two components of Intervertebral Discs
Nucleus pulposes
Annulus pulposes
Function of IVD
- shock absorption
- hold vertebrae together while allowing movement
- separate vertebrae into functional segments
- separate vertebrae to allow passage of nerve roots through intervertebral foramina
Lumbarization
Unfused S1 –> additional lumbar segment
Lower stability, increased mobility
Sacralization
Fused L5 –> additional sacral segment
Lower mobility, increased stability
Spondylosis
Degeneration of IVD
Spondylolysis
Defect in pars interarticularis
Spondylolisthesis
Forward displacement of one vertebral segment over another
Retrolisthesis
Backwards displacement of one vertebra on another
Motion segment
Facet joints + IVDs
Four stages of disc herniation:
- protrusion
- prolapse
- extrusion
- sequestration
Protrusion
Nucleus bulges without rupture of annulus fibrosus
Prolapse
“Only outermost fibres of annulus contain nucleus” (I think it’s a big protrusion)
Extrusion
Annulus is perforated and discal material moves into epidural space
Sequestration
Formation of discal fragments from annulus and nucleus outside the disc proper
Most common herniation locations
L4-5 (affects 5th lumbar nerve root)
then L5-S1 (affects first sacral root)
then L3-4
Common presentation of disc herniation
- few days after excessive activity or mild injury
- aggravated by coughing, sneezing, reaching or stooping
- lumbar muscle spasm –> decreased lordosis
- lateral truck shift in standing
- restricted active flexion and extension
Most common herniation direction
Posterolateral
PLL prevents it from going directly posterior
Herniation: Pain and position
Worse with sitting, lifting, twisting, bending, sustained posture
Morphs to severe pain radiating down one limb
Often better with extension
Herniation: pain in anterolateral leg
L4
Herniation: pain radiating to posterior foot
L5
Cauda equina syndrome
Lesion affecting cauda equina
Loss of bladder and bowel function, saddle anaesthesis
Schmorl’s Nodules
Herniations of nucleus pulposus into vertebral body
Results from direct vertical pressure
Paresthesia
Pins and needles, burning
Herniation vs Facet Lock
Herniation:
– immediate pain, posterior thigh, leg, foot, glutes,
Facet Lock
- pain doesn’t go distal to knee
- back may get locked into position
Mechanical LBP
aka lumbago
Unilateral pain with no referral below knee
Possible strain, sprain, facet joint or SI joint problem
Back/buttock pain.
Worse in flexion. Better with extension.
Stiff in am
Mechanical LBP
Likely disc involvement (minor herniation, spondylosis, sprain, strain)
Back/buttock pain
Worse with extension/rotation
Better with flexion
Mechanical LBP
Likely facet joint involvement, strain
Leg pain below knee
Myotomes affected, dermatome pain
Worse with flexion, better with extension
Nonmechanical LBP
Nerve root irritation – most likely herniation
Leg pain below knee, maybe bilateral
Myotomes affected, dermatome pain
Pain with walking, better with rest
Neurogenic
intermittent claudication
Stenosis
What refers pain to the low back?
Pancreatic tumours
Looks mechanical, but DDx of disc involvement
Pain on standing, flexion
Improvement when walking
No muscle tenderness
Normal lordotic curve
50º
What happens to lumbar SPs during flexion
(Anterior roll, posterior glide)
Move further apart and posteriorly
What happens to lumbar SPs during extension
(Posterior roll, anterior glide)
Move closer together and anteriorly
Three grades of DDD
- dysfunctional
- unstable
- stabilization
Dysfunctional DDD
Phase 1
Tearing around outer surface of annulus
Disc begins to shrink
Unstable DDD
Phase 2
Joint loses strength
Continued tearing on horizontal axis of didsc
Cartilage degeneration
Stabilization (DDD)
Phase 3
Surface of vertebral bodies above and below of IVD showing damage. Disc thin and fibrotic.
Formation of arthritic osteophytes (spurs)
Constant ache
Inflammatory process, venous hypertension
Pain on movement
Noxious mechanical stimulus (stretch, pressure, crush)
Pain accumulates with activity
Repeated mechanical stress
Inflammation
DDD
Pain increases with sustained posture
Muscle fatigue
Gradual tissue creep
Latent nerve root pain
Movement has produced an acute and temporary neuropraxia
IVD’s make up how much of the length of the vertebral column
20-25%
Lumbar resting position
Between flexion and extension
Lumbar close packed position
Full extension
If lumbar lesion is medial to nerve root:
Patient may list to same side as lesion
Demonstrate pain during SLR of unaffected leg
Most important signs of disc herniation
History
Decreased ROM
Neuro dynamic tests