Reliability of zygapophysial joint space measurements made from magnetic resonance imaging scans of acute low back pain subjects: comparison of 2 statistical methods
Language: 
English
Short Title: 
Reliability of zygapophysial joint space measurements made from magnetic resonance imaging scans of acute low back pain subjects
Abstract: 

OBJECTIVE: This purpose of this study was to assess the reliability of measurements made of the zygapophysial (Z) joint space from the magnetic resonance imaging scans of subjects with acute low back pain using new equipment and 2 different methods of statistical analysis. If found to be reliable, the methods of Z joint measurement can be applied to scans taken before and after spinal manipulation in a larger study of acute low back pain subjects. METHODS: Three observers measured the central anterior-to-posterior distance of the left and right L4/L5 and L5/S1 Z joint space from 5 subject scans (20 digitizer measurements, rounded to 0.1 mm) on 2 separate occasions separated by 4 weeks. Observers were blinded to each other and their previous work. Intra- and interobserver reliability was calculated by means of intraclass correlation coefficients and also by mean differences using the methods of Bland and Altman (1986). A mean difference of less than +/-0.4 mm was considered clinically acceptable. RESULTS: Intraclass correlation coefficients showed intraobserver reliabilities of 0.95 (95% confidence interval, 0.87-0.98), 0.83 (0.62-0.92), and 0.92 (0.83-0.96) for each of the 3 observers and interobserver reliabilities of 0.90 (0.82-0.95), 0.79 (0.61-0.90), and 0.84 (0.75-0.90) for the first and second measurements and overall reliability, respectively. The mean difference between the first and second measurements was -0.04 mm (+/-1.96 SD = -0.37 to 0.29), 0.23 (-0.48 to 0.94), 0.25 (-0.24 to 0.75), and 0.15 (-0.44 to 0.74) for each of the 3 observers and the overall agreement, respectively. CONCLUSIONS: Both statistical methods were found to be useful and complementary and showed the measurements to be highly reliable.

Author(s): 
Cramer, Gregory D.
Cantu, Joe A.
Pocius, Judith D.
Cambron, Jerrilyn A.
McKinnis, Ray A.
Item Type: 
Journal Article
Publication Title: 
Journal of Manipulative and Physiological Therapeutics
Journal Abbreviation: 
J Manipulative Physiol Ther
Publication Date: 
2010 Mar-Apr
Publication Year: 
2010
Pages: 
220-225
Volume: 
33
Issue: 
3
ISSN: 
1532-6586
DOI: 
10.1016/j.jmpt.2010.01.009
Library Catalog: 
NCBI Published Medical (?)
Extra: 
PMID: 20350676 PMCID: PMC2854041

Turabian/Chicago Citation

Gregory D. Cramer, Joe A. Cantu, Judith D. Pocius, Jerrilyn A. Cambron and Ray A. McKinnis. 2010 Mar-Apr. "Reliability of zygapophysial joint space measurements made from magnetic resonance imaging scans of acute low back pain subjects: comparison of 2 statistical methods." Journal of Manipulative and Physiological Therapeutics 33: 3: 220-225. 10.1016/j.jmpt.2010.01.009.

Wikipedia Citation

<ref> {{Cite journal | doi = 10.1016/j.jmpt.2010.01.009 | issn = 1532-6586 | volume = 33 | pages = 220-225 | last = Cramer | first = Gregory D. | coauthors = Cantu, Joe A., Pocius, Judith D., Cambron, Jerrilyn A., McKinnis, Ray A. | title = Reliability of zygapophysial joint space measurements made from magnetic resonance imaging scans of acute low back pain subjects: comparison of 2 statistical methods | journal = Journal of Manipulative and Physiological Therapeutics | date = 2010 Mar-Apr | pmid = | pmc = }} </ref>