Lumbar Metrics Flashcards
What is the normal measurement of lumbar lordorsis?
50-60 Degrees
An increased angle is implicated as a mechanical factor in producing what?
Low Back Pain
The center of gravity of the trunk passes through the center of L3 body and continues vertically to intersect what?
Sacral Base
If the line passing the center of L3 body passes anterior to sacrum by more than 0.5in, there may an an incase in shearing forces anterior between what?
Lumbosacral Apophyseal Joints
A posterior shift on the gravity line may indicate increased weight bearing forces on what?
Posterior Lumbosacral Joints which causes LBP
Posterior weight bearing increases stress on what?
Pars Interarticularis
What line should lie about the tip of adjacent superior articular process?
Macnab’s LIne
If macnab’s line intersects superior articulating process, what may be present?
Facet Imbrication (subluxation)
The effect of facets overriding is to mechanically infringe on what?
Size of IVF and lateral recess
With macnab’s line there is a high incidence of abnormal findings in whom?
Asymptomatic Individuals
What key region is normally a smooth transition across joint space?
Hadley’s S Curve
An abrupt interruption of hadley’s S curve causes what?
Facet Imbrication (subluxation)
A wide facet joint will cause what?
Disc Derrangment
If what line is >1.5mm it may be nuclear, annular, and posterior ligament damage?
Van Akkerveeken’s
Van Akkerveeken’s is best performed with what view?
Extension Film
What is a sign of degenerative lumbar instability?
No lateral segmental displacement on vertebral body
What is a sign of ligamentous laxity of posterior joints or altered mont mechanics?
Pedicle Postion (should show progressive rotation)
What shows a poor correlation among abnormal findings and clinical symptoms?
Spinous position
The spinous position should show a gradual spinous deviation of each successive segment into what?
Concavity of Curve
When the lines of the lateral bending studying converge toward bending side in gradually increasing the manner from what?
Lumbosacral Junction up
Localized segmental failure to lateral flexion may indicate what?
Posteriolateral disc herniation
Altered function of posterior joints`
How many grades are there on the meyerding’s method?
4
Anterior inferior L5 body corner should lie posterior to or just contact what?
Ullmann’s Line
What line connect tips of superior and inferior articular processes at each level?
Articular Process Line
To find the posterior body margin locate measurement point at what?
Posterior Body Margin (btwn superior and inferior endplate)
To find the sagittal canal measurement, measure the distance between what?
Posterior Body and Articular process line
What is the line that intersects the bottom half of L4 body or L4-L5 disc and is the most stable position?
Intercrestal Line
An increase in the intercrestal line passing through the upper half of L4 causes what?
L4/L5 Degeneration
A decrease in the intercrestal line passing through the body of L5 causes what?
L5/S1 Degeneration
