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December 2019

J Manipulative Physiol Ther. 1993 Oct; 16(8): 517-22.

The reliability of patient positioning for evaluating static radiologic parameters of the human pelvis.

Plaugher G, Hendricks AH, Doble RW, Bachman TR, Araghi HJ, Hoffart VM.

Palmer College of Chiropractic-West, San Jose, CA 95134-1617.

OBJECTIVE: To determine the reproducibility of patient positioning on radiographically evaluated static configurations of the human pelvis. DESIGN: Repeat anteroposterior radiography of the human pelvis was performed in vivo. Comparative examinations were performed after 1 hr in one subject pool. A second sample underwent repeat examination after a mean of 18 days. SETTING: Outpatient private practice chiropractic clinic. SUBJECTS: Thirty-seven relatively asymptomatic subjects participated in the experiment. MAIN OUTCOME MEASURES: Millimetric evaluations were made for leg length inequality, right/left sacral discrepancies and right/left innominate differences. The null hypothesis was that the difference of the measurements from the two radiographs would be equal to zero. A paired t-test was used to analyze if there were any significant differences. The mean measured difference in millimeters and correlation coefficients were also determined for each variable. RESULTS: Individual variations for several roentgenometric parameters, including leg length inequality and pelvic torsion, did not reach statistical significance (p > .05) although minor millimetric discrepancies were recorded. Correlation coefficients, in most cases, were relatively high. CONCLUSION: A subject can be reliably positioned for repeat anteroposterior pelvic radiography for both 1 hr and 18-day intervals. The methodology described has applicability to full spine radiography when roentgenometric parameters of the pelvis are scrutinized.


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