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Flashcards in Spine Parameters Deck (11):

How is lumbar lordosis measured?

sagittal Cobb angle measurement from the superior end plate of L1 to the sacral end plate


What is normal lumbar lordosis?

Within 11 degrees of the Pelvic Incidence (can range from 20 to 70 degrees)


What levels contribute the most to lumbar lordosis?

L4-5 and L5-S1


What is pelvic incidence? How can it be measured?

PI is the sum of the Pelvic Tilt (PT) and the Sacral Slope (SS)

Geometrically, this is the angle formed between a line from the center of the femoral head to the midpoint of the sacral end plate and a line orthogonal to the sacral end plate


What is the relationship between PI and skeletal maturity?

increases with growth and becomes fixed at skeletal maturity


Which of the pelvic parameters is fixed and serves as the foundation?

Pelvic Incidence


What is pelvic tilt?

the angle formed by a vertical line through the center of the femoral heads and the line from the center of the femoral axis and the midpoint of the sacral end plate


What is a normal value for Pelvic Tilt?

Less than 15 degrees


How do people compensate for a loss of lumbar lordosis?

increase their PT via hip extension


What is sacral slope?

the angle formed between the horizontal and the sacral end plate


What is a plumb line?

A way of assessing sagittal balance

Draw a line from the middle of the C7 vertebral body straight down. It should pass through the superior endplate of S1 by 1.7 to 2 cm