title: Automated pressure-controlled discography with constant injection speed and real-time pressure measurement.
abstract: OBJECTIVE
  This study was designed to investigate automated pressure-controlled discography (APCD) findings, to calculate the elastance of intervertebral discs, and to assess the relationship between the calculated elastance and disc degeneration.
  
  
  METHODS
  APCD was performed in 19 patients. There were a total of 49 intervertebral discs treated. Following intradiscal puncture, a dye was constantly injected and the intradiscal pressure was continuously measured. The elastance of the intervertebral disc was defined as unit change in intradiscal pressure per fractional change in injected dye volume. Disc degeneration was graded using a modified Dallas discogram scale.
  
  
  RESULTS
  The mean elastance was 43.0 +/- 9.6 psi/mL in Grade 0, 39.5 +/- 8.3 psi/mL in Grade 1, 30.5 +/- 22.3 psi/mL in Grade 2, 30.5 +/- 22.3 psi/mL in Grade 3, 13.2 +/- 8.3 psi/mL in Grade 4 and 6.9 +/- 3.8 psi/mL in Grade 5. The elastance showed significant negative correlation with the degree of degeneration (R(2) = 0.529, p = 0.000).
  
  
  CONCLUSIONS
  APCD liberates the examiner from the data acquisition process during discography. This will likely improve the quality of data and the reliability of discography. Elastance could be used as an indicator of disc degeneration.
authors.affiliation: Department of Neurosurgery, Presbyterian Medical Center, Jeonju, Korea.
authors.forename: Hyoung Ihl
authors.initials: HI
authors.lastname: Kim
authors.forename: Dong Ah
authors.initials: DA
authors.lastname: Shin
references.citation: Spine J. 2005 Jan-Feb;5(1):24-35
references.pmid: 15653082
references.citation: Spine J. 2007 Jan-Feb;7(1):68-73
references.pmid: 17197335
references.citation: Spine (Phila Pa 1976). 2000 Jun 1;25(11):1373-80; discussion 1381
references.pmid: 10828919
references.citation: J Korean Med Sci. 2006 Oct;21(5):911-6
references.pmid: 17043428
references.citation: Spine (Phila Pa 1976). 1996 Dec 15;21(24 Suppl):2S-9S
references.pmid: 9112320
references.citation: Spine (Phila Pa 1976). 1999 Feb 15;24(4):364-71; discussion 371-2
references.pmid: 10065521
references.citation: J Bone Joint Surg Am. 1968 Jun;50(4):720-6
references.pmid: 5658557
references.citation: Eur Spine J. 2000 Feb;9(1):36-41
references.pmid: 10766075
references.citation: Pain Med. 2005 May-Jun;6(3):213-21; discussion 222-4
references.pmid: 15972084
references.citation: Spine (Phila Pa 1976). 2006 Aug 15;31(18):2115-23
references.pmid: 16915099
references.citation: Acta Orthop Scand. 1948;17(3-4):231-9
references.pmid: 18879767
references.citation: Spine J. 2001 May-Jun;1(3):198-204
references.pmid: 14588348
references.citation: Spine (Phila Pa 1976). 1995 Dec 15;20(24):2613-25
references.pmid: 8747239
references.citation: J Spinal Disord Tech. 2002 Jun;15(3):193-8
references.pmid: 12131418
references.citation: Spine (Phila Pa 1976). 1999 Dec 1;24(23):2542-7
references.pmid: 10626318
references.citation: Spine (Phila Pa 1976). 1996 Feb 1;21(3):402-4
references.pmid: 8742222
references.citation: Spine (Phila Pa 1976). 2004 Oct 1;29(19):2134-9
references.pmid: 15454704
references.citation: Spine (Phila Pa 1976). 1995 Sep 1;20(17):1878-83
references.pmid: 8560335
references.citation: Spine (Phila Pa 1976). 1988 Dec;13(12):1349-51
references.pmid: 2975062
references.citation: AJR Am J Roentgenol. 1990 Jan;154(1):159-62
references.pmid: 2136783
references.citation: Spine (Phila Pa 1976). 1999 Jan 1;24(1):44-53
references.pmid: 9921590