Normative spino-pelvic parameters in patients with the lumbarization of S1 compared to a normal asymptomatic population.
Normal spino-pelvic values for patients with lumbarization of S1 have not been described in the literature. Presented are the normal values for this population group, the prevalence of S1 lumbarization, and the correlation between pelvic incidence (PI) and lumbar lordosis (LL) in this group.



Two databases of asymptomatic patients were combined to identify 11 patients with the lumbarization of S1. The whole spine images were used to measure the true prevalence rate. Lumbar 3D EOS models were built to measure spino-pelvic parameters for the lumbarization group compared to the asymptomatic population. Seven patients appeared at first to have six lumbar vertebrae, but counting caudally from C2 showed this was not the case.



11/268 patients demonstrated the lumbarization of S1 to give a true prevalence rate of 4.1 %. The lumbarization group demonstrated a statistically significant difference with regard to PI, PT, and SS, and total lordosis measured from superior endplate of L1 to the superior endplate of the first fixed sacral segment. L6I was not significantly correlated to lordosis; however, PI did have a significant correlation with lordosis. Lordosis could be estimated in this group by the equation: [Formula: see text].



Incomplete imaging of the spine may lead to false estimation of the prevalence of lumbarization. Patients with lumbarization have higher lordosis values and lordosis can now be estimated during pre-operative planning for this group.
Department of Orthopaedics, Hawkes Bay Hospital, 398 Omahu Rd, Hastings, 4120, New Zealand.
R
R
Price
Niigata Spine Surgery Centre, Niigata, Japan.
M
M
Okamoto
Spine Unit 2, Research Lab, Bordeaux University Hospital, CHU Pellegrin, 33076, Bordeaux, France. j-c.lehuec@u-bordeaux.fr.
J C
JC
Le Huec
Niigata Spine Surgery Centre, Niigata, Japan.
K
K
Hasegawa
D000293:Adolescent; D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D016208:Databases, Factual; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D021621:Imaging, Three-Dimensional; D007564:Japan / Q000453:epidemiology; D008141:Lordosis / Q000151:congenital / Q000000981:diagnostic imaging* / Q000453:epidemiology; D008159:Lumbar Vertebrae / Q000002:abnormalities* / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009139:Musculoskeletal Abnormalities / Q000150:complications / Q000000981:diagnostic imaging* / Q000453:epidemiology; D015995:Prevalence; D011859:Radiography; D012016:Reference Values; D012447:Sacrum / Q000002:abnormalities* / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000473:pathology; D013131:Spine / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000473:pathology; D055815:Young Adult
L6 vertebrae; Lumbarization; Lumbosacral transitional vertebrae; Pelvic incidence; Sagittal balance
Indian J Nucl Med. 2015 Apr-Jun;30(2):183-4
25829746
Eur Spine J. 2001 Aug;10 (4):314-9
11563617
Arthritis. 2013;2013:461425
23864947
Radiology. 1992 Feb;182(2):580-1
1732988
Global Spine J. 2014 Dec;4(4):229-32
25396103
Insights Imaging. 2014 Feb;5(1):77-83
24052419
Bone Joint J. 2013 Nov;95-B(11):1533-7
24151275
Korean J Radiol. 2014 Mar-Apr;15(2):258-66
24644411
Eur Spine J. 2001 Jun;10 (3):228-33
11469734
Spine J. 2011 Sep;11(9):858-62
21951610
Spine (Phila Pa 1976). 1984 Jul-Aug;9(5):493-5
6495013
Spine (Phila Pa 1976). 1999 Sep 1;24(17 ):1852-5
10488518
Eur Spine J. 2016 Nov;25(11):3630-3637
26951168
Eur Spine J. 2016 Nov;25(11):3602-3607
26814474
Spine (Phila Pa 1976). 2005 Feb 1;30(3):346-53
15682018
Pain Physician. 2004 Jan;7(1):107-10
16868621
Eur Spine J. 1998;7(2):99-103
9629932
Eur Spine J. 2006 Apr;15(4):415-22
16179995
Spine (Phila Pa 1976). 2013 May 1;38(10 ):E573-8
23392421