In the segmental dysfunction model, what defines the lesion state of the subluxation?

In the segmental dysfunction model, what defines the lesion state of the subluxation?

• A. Hypertonicity of Surrounding Musculature
• B. Loss of Motion/Fixation
• C. Pain
• D. Vertebral Misalignment

Answer: (B)

In this model, the lesion is defined by a loss of motion at a single spinal motion unit—that is, a fixation or hypomobility at the segment. This reflects a functional mechanical impairment of the joint rather than a need for a visible vertebral misalignment. Pain or muscle hypertonicity may accompany the dysfunction, but they are not what defines the lesion. Vertebral misalignment, while sometimes present, is not required to claim a segmental dysfunction.

In this model, the lesion is defined by a loss of motion at a single spinal motion unit—that is, a fixation or hypomobility at the segment. This reflects a functional mechanical impairment of the joint rather than a need for a visible vertebral misalignment. Pain or muscle hypertonicity may accompany the dysfunction, but they are not what defines the lesion. Vertebral misalignment, while sometimes present, is not required to claim a segmental dysfunction.