adj.tech.final Flashcards
What are some of the features of the bony anatomy of the lumbar vertebra?
1) Kidney shaped 2) Wider than deep 3) Increases in size from above down 4) forms a lordotic curve
Are vertebral bodies in the lumbar wide or deeper?
Wider than deep.
What are lumbar vertebra like at birth?
Concave.
When will the lordosis develop?
With walking.
When is the lordosis fully developed? ***
By 8-10 years.
What is the acceptable standard for the degrees of lumbardosis?***
NO acceptable degree (30-35 common range).
What is the typical range of the sacral base angle?
37 - 42, 35-45 degrees
What is the height of an IVD?
about 9 mm in height
What is the ratio between IVD and lumbar vertebral body?
Ratio is 1:3.
What does the increased height of the disc to body do for lumbar flexibility?
It allows for increased lumbar flexibility over thoracic spine
What is the major role of the IVD?***
not to direct movement, but in absorbing and dispersing compressive loads.
What shape are the articular facets of the lumbar vertebrae?
Slightly cupped shaped
What plane do the lumbar articular facets sit in?
Sagittal, with lumbosacral becoming more coronal
Which facet (inferior or superior) is convex and which facet is concave?
Inferior articular facets = convex, Superior articular facets = concave
What are the inferior facets of the lumbar vertebrae like? ***
Inferior facet lies inside the superior facet.
What is the function of the lumbar facets? ***
Resists rotation (less so at L5-S1).
In which facets are facetal tropism most commonly found?
In the lumbosacral facets
What percentage of the axial load do facets normally carry?
18%
What percentage of the axial load do facets carry in hyper extended postures?
Up to 33%
What provides up to 45% of the torsional strength of the lumbar spine?
The facets with their articular capsules
What is the relationship of facetal planes to palpation and adjusting vectors?
Avoidance of jamming or compressive adjusting forces
What is the physical presentation of lumbar vertebrae TP’s?
Small and run obliquely posterolateral
What are used in place of TP’s for adjustive contacts in the lumbars?
Mammillary bodies to avoid uncomfortable pressure on the TPs.
Where are Mammilary bodies found at in relation to the SPs?
Located up one interspinpous and out.
How do the lumbar SPs run in relation to the vertebral body?
Run almost directly horizontal to the vertebral body
What is the shape of lumbar SPs?
Large and hatchet shaped
What do the SPs do in terms of extension?
Provides a bony block to extension
How is the L5 SP different than the other lumbar SPs?
The L5 SP is shorter, more rounded and difficult to distinguish
What are the lumbar SPs like for palpation?***
Superficial and sensitive to firm pressure. Necessitates broad and padded adjustive contacts.
What is the GROM for extension of the lumbar spine?
30 degress of extension
What is the GROM for flexion of the lumbar spine?
90 degrees of flexion
In which direction is the GROM the greatest in the lumbar spine?
Flexion - extension motion
How many times is flexion greater than extension?
2 times as much flexion as extension
What percent of trunk flexion occurs in the lumbar spine?
75%
What is the degree of SROM for flexion-extension per segment of combined movement in the lumbar spine?
14 degrees
What is the degree of movement for flexion-extension at L1-L2 and what is the degree of movement at L5-S1?
L1-L2 = 12 degrees, L5-S1 = 17 degrees
What is the pattern of motion for flexion-extension in the lumbar spine?
Sagittal plane rotation coupled with some sagittal plane translation
How much translation in the lumbar spine for flexion-extension is clinically unstable?
> 4.5mm
When will the IVD open and approximate?
Opens posteriorly during flexion and approximates during extension.
Is there a significant shift in the nucleus during flexion-extension of the lumbar spine?
No
Which way does the disc bulge during flexion-extension of the lumbar spine?
Bulges on the concave side and retracts on the convex side
How do the articular facets glide during flexion and extension?
Articular facets glide apart during flexion and approximate during extension
What is the GROM for rotation of the lumbar spine?
5-18 degrees to each side
Where does the greatest degree of trunk rotation occur?
Occurs in the thoracic spine
What is the pattern of motion for rotation of the lumbar spine?
Movement occurs predominantely in the transverse plane. Rotation is coupled with lateral flexion
Is coupling stronger with primary rotation or with primary lateral flexion?
Primary lateral flexion provides a stronger coupled rotation than coupled lateral flexion that occurs with primary rotation.
What sided lateral flexion is coupled with rotation of the upper 3 segments of the lumbar spine?
Rotation in the upper three segments is coupled with opposite side lateral flexion
What sided lateral flexion is coupled with rotation of the lower segments of the lumbar spine?
Rotation in the lower is coupled with same side lateral flexion
At what point in the lumbar spine is there an increased incidence of degenerative change?
L4-L5 transition point
When will the lumbar facet joints gap with rotation?
On the side of rotation and approximate on the side opposite rotation.
Which joints act as a barrier to rotational mobility in the lumbar spine?
Facet joints
What is the GROM for Lateral flexion of the lumbar spine?
approximately 25 degrees to each side
What is the SROM for Lateral flexion of the lumbar spine?
approximately 6 dgrees per side with movement dropping to 3 degrees at L5-S1
What is the pattern of motion for lateral flexion of the lumbar spine?
Lateral flexion is coupled with opposite side rotation (SPs rotate to the concavity)
Under what spinal postions do the patterns of motion for lateral flexion occur?
Present with the spine in a neutral or extended position
During lateral flexion which side does the IVF open and which side closes?
Opens on the contralateral side and closes on ipsilateral side
During lateral flexion which side does the IVD bulge and retract?
The disc bulges on the concave side and retracts on the convex side
During lateral flexion, does the nucleus shift?
No the nucleus does not significantly shift
During lateral flexion, which side of the articular facets glide apart and which side approximates?
The contralateral facets glide apart and the ipsilateral facets approximate
What is the coupled motion like in the lumbar spine?
rotation with lateral flexion.
When will the rotation that is coupled with lateral flexion be reduced or reversed?
When the spine is flexed.
What will the spine do when laterally flexed or rotated?
Undergo slight flexion.
Name the adjustive setup that is not possible in the lumbars?
Resisted hypothenar spinous push for rotation / lateral flexion. Only done assisted.
What are the 4 elements of lumbar adjusting?
1) Reduce articular slack, 2) Stabilize adjacent spinal joints 3) Establish contact points 4) Establish Adjustive vector
How is slack reduced as a patient positioning component?
It is reduced by moving a joint toward end range
What are assisted patient positions?
Contact vertebra and vertebra above contact point are moved in the direction of adjustive thrust
What are resisted patient positions?
Vertebra above contact point are moved in the direction opposite the adjustive thrust
What is the intended mechanical effects seen with a flexion dysfunction adjustment?
Cavitation and stretching of the posterior joints, disc and posterior segmental soft tissues.
What does joint stabilization entail?
Counter tension and locking (induce points of resistance for adjustive thrusts
What are some ways to provide joint stabilization?
Tables, pillows, Doctro’s indifferent hand contacts, legs, forearms
What are contact points designed for?
Established to more specifically direct maximal adjustive force to a specific level or region
What is an assisted contact point?
Contact superior vertebr of dysfunctional joint (effect joint inferior to contact)
What is a resisted contact point?
Contact inferior vertebra of dysfunctional joint (effect joint superior to contact)
What would be malposition listing for a flexion restriction of L3-4?
Extension malposition L3.
What is adjustive vector and thrust?
Provides the force and direction critical to producing the desired movement
What is an assisted vector and thrust?
Thrust on superior vertebra in direction of joint restriction
What is an resisted vector and thrust?
Thrust on inferior vertebra in direction opposite joint restriction
What is an counter thrust?
Thrust applied on adjacent vertebral levels to induce movement in direction of joint restriction (one assisted, one resisted)
What are the limitation of assisted and resisted language?
ie: supine technique, solved by classifying method by which vertebra of motion segment are contacted
Whais the intended Mechanical Effects of flexion dysfunction adjustments?
Cavitation and stretching of the posterior joints, disc and posterior segmental soft tissues.
What is the movement caused by a flexion dysfunction adjustment?
Bilateral gliding separation in the sagittal plane
Which are the two adjustments that can fix a flexion dysfunction?
1) Assisted hypothenar spinous push 2) Resisted hypothenar spinous push
Describe the components of a Assisted hypothenar spinous push adjustment for flexion
1) Superior vertebral contact 2)either side up 3) P-A & I-S vector
Describe the components of a Resisted hypothenar spinous push for flexion
1) inferior vertebral contact 2) either side up 3) P-A & S-I vector
For flexion dysfunction adjustments, which contacts are preferred and why?
Assisted contacts are preferred since it is a less stressful position on the doctor’s shoulder
What is the intended mechanical effects seen with an extension dysfunction adjustment?
Gliding approximation of the posterior joints and disc. Stretching of the anterior segmental soft tissue.
What is the movement caused by a extension dysfunction adjustment?
Bilateral gliding approximation in the sagittal plane
Name a restriction listing for a flexion malposition at L3?
Extension restriction L3-4.
Which are the two adjustments that can fix an extension dysfunction?
1) Assisted hypothenar spinous push 2) Resisted hypothenar spinous push
Describe the components of a Assisted hypothenar spinous push adjustment for extension
1) superior vertebral contact 2) either side down 3) P-A & S-I vector