Pelvic tilt
Angle between the vertical reference line (VRL) and a line drawn from the midpoint of the femoral head to the midpoint of the S1 endplate
Normal 10-25 º
Alignment objective < 20º
Pelvic Tilt (PT)
– 0:nonpathologic(PT<20°)
– +: moderate deformity(20°<PT<30°)
++: marked deformity(PT>30°)
Pelvic tilt > 20° suggests the patient is trying to compensate by retroverting the pelvis (some authors accept up to 25° as normal).
Higher HQOL scores in elderly individuals are associated with less lumbar lordosis and increased compensatory pelvic tilt.
see also:
Pelvic tilt (PT) is a compensatory mechanism for adult spinal deformity patients to mitigate sagittal imbalance.
The angle between the line connecting the midpoint of the sacral plate to the axis of the femoral heads, and the vertical.
In adult spinal deformity (ASD), patients increase pelvic tilt (PT) to maintain standing alignment. Previously, ASD patients with low PT and high disability were described.
Adult deformity patients with high preoperative PT treated with minimally invasive surgical techniques had less radiographic success but equivalent clinical outcomes as patients with low PT 1).