title: Comparison of radiographic and computed tomographic measurement of pedicle and vertebral body dimensions in Koreans: the ratio of pedicle transverse diameter to vertebral body transverse diameter.
abstract: This study was designed to investigate the characteristics of pedicle transverse diameters (PD), vertebral body transverse diameters (VBD), especially the ratios of PD/VBD (CT ratio), which has never been discussed, in Koreans using computed tomography (CT) scans and to evaluate the possibility of obtaining more accurate estimations of PD from plain radiographs using the CT ratios in each spine level. The T1-L5 vertebrae of 50 participants were analyzed prospectively with CT scans (CT-VBD and CT-PD), and the T9-L5 vertebrae of the same participants were investigated with plain radiographs (X-VBD and X-PD). The CT ratio had a higher correlation with the CT-PD (r2 = 0.630) from T1 to L5, especially in the lower thoracic and lumbar spine (T9-L5, r2 = 0.737). The correlation of VBDs between the two radiologic tools (r2 = 0.896) was higher than that of the PDs (r2 = 0.665). Based on the data, equations for the estimation of a more accurate PD from plain radiographs were developed as follows: estimated PD = estimated VBD × [1.014 × (X-VBD) + 0.152] × the mean CT ratio at each spinal level. The correlation between the estimated PD and the CT-PD (r2 = 0.852) was improved compared with that (r2 = 0.665) between the X-PD and the CT-PD. In conclusion, the CT ratio showed a very similar changing trends to CT-PD from T1 to L5 regardless of sex and body mass, and the measurement error of PD from only plain radiographs could be minimized using estimated VBD and the mean CT ratio at each spinal level.
authors.affiliation: Department of Orthopedic Surgery, College of Medicine, Chung-Ang University, Heukseok-dong, Dongjak-gu, Seoul 224-1, Korea.
authors.forename: Ki Ser
authors.initials: KS
authors.lastname: Kang
authors.forename: Kwang-Sup
authors.initials: KS
authors.lastname: Song
authors.forename: Jong Seok
authors.initials: JS
authors.lastname: Lee
authors.forename: Jae Jun
authors.initials: JJ
authors.lastname: Yang
authors.forename: In Sup
authors.initials: IS
authors.lastname: Song
mesh_terms: D000328:Adult; D000886:Anthropometry / Q000379:methods; D044466:Asian People; D015992:Body Mass Index; D005260:Female; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011859:Radiography / Q000379:methods*; D056910:Republic of Korea / Q000208:ethnology; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult
references.citation: Spine (Phila Pa 1976). 1993 Oct 1;18(13):1850-5
references.pmid: 8235871
references.citation: Spine (Phila Pa 1976). 2002 Mar 1;27(5):453-9
references.pmid: 11880829
references.citation: Spine (Phila Pa 1976). 1989 Apr;14(4):367-72
references.pmid: 2718038
references.citation: AJR Am J Roentgenol. 1985 Aug;145(2):327-35
references.pmid: 3875234
references.citation: J Bone Joint Surg Am. 1948 Jul;30A(3):560-5
references.pmid: 18109577
references.citation: J Bone Joint Surg Am. 1990 Apr;72(4):541-9
references.pmid: 2139030
references.citation: Clin Orthop Relat Res. 1986 Feb;(203):75-98
references.pmid: 3956000
references.citation: Surg Radiol Anat. 1988;10(4):317-22
references.pmid: 3145574
references.citation: Spine (Phila Pa 1976). 1987 May;12(4):362-7
references.pmid: 3616751
references.citation: Spine (Phila Pa 1976). 2003 Apr 15;28(8):744-9
references.pmid: 12698114
references.citation: Spine (Phila Pa 1976). 1994 Jul 1;19(13):1495-8
references.pmid: 7939981
references.citation: Spine (Phila Pa 1976). 1987 Mar;12(2):160-6
references.pmid: 3589807
references.citation: Spine (Phila Pa 1976). 2000 Mar 15;25(6):709-15
references.pmid: 10752103
references.citation: Spine (Phila Pa 1976). 2004 Jun 1;29(11):1174-81
references.pmid: 15167654
references.citation: Spine (Phila Pa 1976). 1992 Jun;17(6 Suppl):S160-3
references.pmid: 1385900
references.citation: Clin Orthop Relat Res. 1986 Feb;(203):99-112
references.pmid: 3956001
references.citation: Spine (Phila Pa 1976). 1996 Dec 1;21(23):2705-8
references.pmid: 8979314
references.citation: Spine (Phila Pa 1976). 1994 Oct 15;19(20 Suppl):2274S-2278S
references.pmid: 7817242
references.citation: Spine (Phila Pa 1976). 2002 Nov 15;27(22):2467-71
references.pmid: 12435976
references.citation: Spine (Phila Pa 1976). 1988 Jan;13(1):27-32
references.pmid: 3381134
references.citation: Spine (Phila Pa 1976). 1992 Mar;17(3):299-306
references.pmid: 1566168
references.citation: Spine (Phila Pa 1976). 1994 Jun 15;19(12):1390-4
references.pmid: 8066521