Biomechanical Evaluation Flashcards

A patient's thoracic cage is shifted to the left relative to the pelvis without rotation. This posture is described as:

Answer: Thoracic Tx translation

Lateral shifting of the thoracic cage is a translation along the x-axis (Tx).

When the head translates laterally, CBP biomechanics predicts which coupled change in the cervical spine on the AP view?

Answer: Lateral bending of the lower neck with an opposite upper-cervical compensation

Lateral head translation causes the lower cervical spine to bend toward the translation while the upper cervical spine compensates in the opposite direction, creating an S-shape.

In a sagittal balance evaluation, a C7 plumb line falling well anterior to the posterior-superior corner of S1 indicates:

Answer: Positive sagittal balance (forward imbalance)

A C7 plumb line anterior to S1 shows positive sagittal imbalance, with the trunk carried forward.

Which pelvic relationship is correct?

Answer: Pelvic incidence = pelvic tilt + sacral slope

Pelvic incidence is a fixed anatomical angle equal to pelvic tilt plus sacral slope.

Why are the postural patterns from a CBP evaluation important when planning mirror image adjustments and exercises?

Answer: They show the exact opposite position the patient should be placed in

Mirror image procedures put the patient in the opposite of their measured postural displacement.

A digital posture analysis shows the pelvis shifted forward relative to the feet. This is recorded as:

Answer: Pelvic +Tz translation

Forward displacement of the pelvis is a translation along the z-axis (+Tz).

In a lateral cervical film, a reversed (kyphotic) curve is typically shown by which measurement finding?

Answer: A C2-C7 posterior tangent angle in the kyphotic (opposite) direction

Cervical kyphosis appears as a C2-C7 angle in the kyphotic direction, the opposite of normal lordosis.