J Korean Soc Spine Surg.  2011 Dec;18(4):223-229. 10.4184/jkss.2011.18.4.223.

Changes in Sagittal Spinopelvic Parameters according to Pelvic Incidence in Asymptomatic Old Korean Men

• Kang KB
• Ahn YJ
• Kim YJ
• Kim YB
• Park SC

• KMID: 1448000
• DOI: http://doi.org/10.4184/jkss.2011.18.4.223

Abstract

STUDY DESIGN: A radiographic study of normal subjects.
OBJECTIVES
To analyze sagittal spinal parameters according to the size of pelvic incidence (PI). SUMMARY OF LITERATURE REVIEW: There has been no previous study about the classification of spinopelvic parameters that has used a large cohort of asymptomatic older men with the same ethnic background as those in the current study.
MATERIALS AND METHODS
We examined 160 males aged over 50 without disease, trauma, or history of operation on spine or lower extremities. Sagittal standing radiographs of the whole spine on 36-inch film were taken. Group 1 (n=30) had a PI of less than 40degrees. Group 2 (n=71) had PI between 40degrees and 50degrees, and group 3 (n=59) had a PI greater than 50degrees. Thoracic kyphosis, thoracolumbar kyphosis, lumbar lordosis, the vertebral slope of T12, sacral slope, and pelvic incidence were measured. The distances from the plumb line of C7, T12, and the lumbar apex to the posterosuperior corner of the sacrum were also measured.
RESULTS
Subjects' average age was 64.1(53~83).Lumbar lordosis, sacral slope and pelvic tilt were all significantly increased in group 3. Thoracic kyphosis and the vertebral slope of T12 were not different between groups. The distances from the plumb line of C7, T12, and the lumbar apex to the posterosuperior corner of the sacrum were significantly translated anteriorly in group 3.
CONCLUSIONS
Group 3, who had the largest PI, demonstrated the largest lumbar lordosis and the most forward transition of trunk. However there were no differences in thoracic kyphosis and the vertebral slope of T12 among the three groups.

Keyword

Old age; Sagittal; Pelvis; Lumbar; Classification

MeSH Terms

Aged
Animals
Cohort Studies
Humans
Incidence
Kyphosis
Lordosis
Lower Extremity
Male
Pelvis
Sacrum
Spine

Figure

• 

  Fig. 1. Group 3 with largest pelvic incidence demonstrated the largest lumbar lordosis and sacral slope, and the most forward transition of trunk or increased horizontal anterior translation of C7 plumbline. The size of thoracic kyphosis and T12 LEP-H angle did not show the difference. TK; Thoracic kyphosis (T5 UEP- 12 LEP), LL; lumbar lordosis (T12 LEP–S1 UEP), T12 LEP-H; T12 lower end plate-horizontal angle, SS; Sacral slope, PI; Pelvic incidence

• 

  Fig. 2. The significant chain of correlations is observed between the positional pelvic and spinal parameters and the morphological pelvic incidence.

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