Go Back   ISPINE.ORG Forum > Main forums > Abstracts and Articles
FAQ Members List Calendar Search Today's Posts Mark Forums Read

Abstracts and Articles Discuss Facet joint orientation in spondylolysis and isthmic spondylolisthesis. in the Main forums forums; J Spinal Disord Tech. 2008 Apr ;21 (2):112-5 18391715 (P,S,E,B,D) Facet joint orientation in ...

LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 06-16-2008, 06:11 PM
Senior Member
Join Date: May 2008
Posts: 196
Default Facet joint orientation in spondylolysis and isthmic spondylolisthesis.

J Spinal Disord Tech. 2008 Apr ;21 (2):112-5 18391715 (P,S,E,B,D) Facet joint orientation in spondylolysis and isthmic spondylolisthesis.

(from BioInfoBank Library)

[My paper] Angus S Don, Peter A Robertson

Department of Orthopaedic Surgery, Auckland Hospital, Private Bag, Auckland, New Zealand.

STUDY DESIGN: The orientation of facet joints (FJs) in a normal population and isthmic spondylolisthesis (IS) population was assessed using magnetic resonance imaging in the lumbar spine. OBJECTIVE: To document the difference in FJ orientation (FJO) between a normal population and a population with spondylolysis of L5 and IS.

SUMMARY OF BACKGOUND DATA: Spondylolysis and IS have both a familial and mechanical etiology, yet the phenotypic expression of the familial etiology is unknown except for the observation of spinal bifida occulta. Other posterior element abnormalities are unrecognized, and any FJO abnormality below the pars defect has been ignored because of presumed previous mechanical defunctioning by the development of that pars defect at an earlier age. The recognition of multilevel sagittal FJO in L4/5 degenerative spondylolisthesis (DS), raises the possibility that more proximal segment examination may reveal FJ variations in IS.

METHODS: Magnetic resonance imaging scans were used to measure the orientation of the FJ at L3/4, L4/5, and L5/S1 in 30 individuals with normal scans, and 30 patients with IS. The angular measurement recorded was in relation to the coronal plane. Repeated measurements confirmed the validity of the method.

RESULTS: Mean measurement of axial FJO at L3/4 and L4/5 was 51.1 and 42.5 degrees in the controls, and 45.2 and 35.0 degrees in IS. The more coronal angulation at the levels above a pars defect in IS was highly statistically significant (P=<0.001 at L3/4 and P=<0.0001 at L4/5). At L5/S1, orientations were the same (39 degrees) in each group.

CONCLUSIONS: Relative coronal FJO in the lumbar spine may be the phenotypic expression of the familial etiology of IS. This may result in increased stress concentration in the pars between or below coronally oriented FJs. These more coronal FJOs in IS may also explain the common observation of retrolisthesis at L4/5 above IS when the L4/5 disc degenerates, lateral overhang of the L4/5 FJ to the L5 pedicle entry point above an IS, and the rare combination of DS at L4/5 and IS at L5/S1 when both disorders are separately common. This latter observation can be explained by the observation that DS occurs in those individual with sagittal lumbar facets, and that IS occurs in those with more coronal FJs.
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT. The time now is 12:16 PM.

Powered by vBulletin® Version 3.7.2
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.