Which of the following is NOT a valid restriction pattern among PRS, PLS, and PLI?

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Multiple Choice

Which of the following is NOT a valid restriction pattern among PRS, PLS, and PLI?

Think about how restriction patterns are defined: when the motion is limited in flexion, the accompanying directions of rotation and lateral bending follow specific couplings. In this system there are three valid pairings for flexion-based restrictions. Two of them lock rotation and lateral bend to the same side (both right or both left). The third pairing is rotation to one side with lateral bend to the opposite side (left rotation with right lateral bend). The combination of flexion with rotation to the right and lateral bending to the left does not match any of these established couplings, so it cannot be a valid restriction pattern. The other three options fit one of the three valid pairings.

Think about how restriction patterns are defined: when the motion is limited in flexion, the accompanying directions of rotation and lateral bending follow specific couplings. In this system there are three valid pairings for flexion-based restrictions. Two of them lock rotation and lateral bend to the same side (both right or both left). The third pairing is rotation to one side with lateral bend to the opposite side (left rotation with right lateral bend). The combination of flexion with rotation to the right and lateral bending to the left does not match any of these established couplings, so it cannot be a valid restriction pattern. The other three options fit one of the three valid pairings.

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