In the segmental dysfunction framework, which statement best describes the lesion state?

In the segmental dysfunction framework, which statement best describes the lesion state?

• A. Hypertonicity of Surrounding Musculature
• B. Loss of Motion/Fixation
• C. Pain as the Sole Indicator
• D. Vertebral Rotation Only

Answer: (B)

In segmental dysfunction, the lesion state is defined by a loss of motion at a spinal motion segment, a state of fixation where the joint’s mobility is restricted. This reflects how practitioners assess a dysfunctional segment: the segment doesn’t move freely through its normal range, and the end feel and mobility are altered, often with surrounding tissues guarding or tightening to protect the area. Hypertonicity of surrounding musculature can accompany dysfunction but it is not the defining state—muscle tension can occur in many situations and does not specify the underlying constraint at the joint itself. Pain may be present, but it is not required for a segment to be considered dysfunctional; some segments can be functionally restricted with little or no pain. Likewise, vertebral rotation alone is an incomplete description because dysfunction typically involves reduced mobility in multiple planes, not just rotation.

In segmental dysfunction, the lesion state is defined by a loss of motion at a spinal motion segment, a state of fixation where the joint’s mobility is restricted. This reflects how practitioners assess a dysfunctional segment: the segment doesn’t move freely through its normal range, and the end feel and mobility are altered, often with surrounding tissues guarding or tightening to protect the area.

Hypertonicity of surrounding musculature can accompany dysfunction but it is not the defining state—muscle tension can occur in many situations and does not specify the underlying constraint at the joint itself. Pain may be present, but it is not required for a segment to be considered dysfunctional; some segments can be functionally restricted with little or no pain. Likewise, vertebral rotation alone is an incomplete description because dysfunction typically involves reduced mobility in multiple planes, not just rotation.