Researchers found that, in patients with adult spinal deformity, the T1
pelvic angle can be useful as a preoperative planning tool, with a
target T1 pelvic angle of less than 14°.
In a multicenter, prospective study,
researchers included 559 patients with adult spinal deformity, an age
older than 18 and either a coronal Cobb angle of 20° or greater, a
sagittal vertical axis of 5 cm or greater, a pelvic tilt of 25° or
greater, or a thoracic kyphosis of 60° or greater for analysis.
The researchers collected data from
standardized health-related quality-of-life questionnaires, in addition
to clinical, demographic and radiographic information for all patients
at baseline.
T1 pelvic angle was found to correlate with the sagittal vertical axis, pelvic incidence minus lumbar lordosis and pelvic tilt.
Upon categorizing the patients by increasing T1 pelvic tilt (ie, <10°, 10° to 20°, 21° to 30°, and >30°), the researchers found a significant and progressive worsening of health-related quality of life.
The researchers also found that the T1 pelvic angle and sagittal vertical axis correlated with Oswestry Disability Index (ODI), Scoliosis Research Society (SRS)-22 and SF-36 scores.
Results of a linear regression analysis demonstrated that a T1 pelvic angle of 20° corresponded to severe disability, or an ODI of more than 40, and the meaningful change in T1 pelvic angle corresponding to one minimal clinically important difference was 4.1° on the ODI, according to the researchers.
Source : Healio , 31st Oct 2014
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