Which of the following correctly states PLI restrictions?

Prepare for your Movement Science Midterm Test with flashcards and multiple choice questions, each with hints and explanations. Boost your exam readiness!

In this topic, you’re looking at how the spine’s passive restraints behave when they’re compromised. PLI restrictions reflect a pattern where the movements that load the ligaments are limited, and the coupled nature of lumbar motion causes specific opposite-direction restrictions to appear.

Flexion loads the posterior ligaments most, so when these structures are involved, flexion becomes restricted. The lumbar spine also moves in coupled ways: rotation is tied to lateral bending in opposite directions. With a unilateral ligamentous issue, the pattern that emerges is limited flexion along with rotation to one side and lateral bending to the opposite side. The described combination—flexion restricted, rotation restricted to the left, and lateral bending restricted to the right—fits that pattern precisely. It matches the typical PLI restriction presentation caused by posterior ligament involvement, whereas other patterns would imply different structural issues (like extension abnormalities or mismatched sides of motion).