Pelvic Incidence and Lumbar Spine Instability Correlations in Patients with Chronic Low Back Pain


Mohammad-Reza Golbakhsh 1 , Majid Attar Hamidi 1 , Bahar Hassanmirzaei ORCID 2 , *

1 Sina Hospital Tehran University of Medical Sciences, Tehran, Iran

2 Sports Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran

How to Cite: Golbakhsh M, Hamidi M A, Hassanmirzaei B. Pelvic Incidence and Lumbar Spine Instability Correlations in Patients with Chronic Low Back Pain, Asian J Sports Med. Online ahead of Print ; 3(4):34554. doi: 10.5812/asjsm.34554.


Asian Journal of Sports Medicine: 3 (4); 291-296
Published Online: November 30, 2012
Article Type: Research Article
Received: March 14, 2012
Accepted: July 7, 2012


Purpose: Many factors such as lumbar instability and spinopelvic alignment are associated with low back pain. Our purpose was to analyze the pelvic incidence - one of spinopelvic alignment parameters- and spine instability correlations in patients with chronic low back pain.

Methods: Fifty-two patients suffering from chronic low back pain entered this case control study. Lateral spine radiography was taken from patients. pelvic incidence and L3, L4 and L5s vertebral body width were measured for all patients, and lumbar instability was evaluated in 3 different levels: L5-S1, L4-L5 and L3-L4.

Results: Thirty-two patients having lumbar instability formed group A and 20 patients without lumbar spine instability allocated to group B. Average age, mean weight, height, body mass index and mean vertebral width of both groups did not differ meaningfully. Pelvic incidences mean amounts set to 53.9 in group B and 57.7 in group A without any significant difference; but pelvic incidence was significantly lower in patients with lumbar instability of L5-S1 origin (P=0.01).

Conclusions: Overall, pelvic incidence did not differ between two groups. However, separate evaluation of each level revealed lumbar instability of L5-S1 segment to be associated with lower pelvic incidence.

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