title: Back pain in pregnancy--magnetic resonance imaging correlation.
abstract: OBJECTIVE
  To study the relationship of disk abnormality and signal changes of the uterine cervix on magnetic resonance imaging (MRI) with back pain in pregnancy at 36-39 weeks of gestation.
  
  
  METHODS
  One hundred and five pregnant Chinese women with previous Caesarean section at 36-39 weeks gestation undergoing magnetic resonance pelvimetry performed for a study for trial of vaginal delivery were questionnaired for back pain. Sagittal T2-weighted images were analysed for intervertebral disk abnormality, and signal intensity of the uterine cervix on the same sagittal images. The findings on MRI were correlated with back pain.
  
  
  RESULTS
  Seventy-three (70%) of the pregnant women had back pain. Disk bulge or prolapse were infrequent but correlated significantly with the presence of back pain (P=0.02). Women with back pain in the current pregnancy tended to have a higher signal intensity of the uterine cervix compared with those without (P=0.006). Women with a history of back pain also had higher cervical signal intensity compared with those without (P=0.02).
  
  
  CONCLUSIONS
  Disk bulge or prolapse was associated with back pain in pregnancy but were relatively infrequent. The significant correlation of high signal intensity in the uterine cervix and back pain suggested that soft tissue laxity may be a more important cause of back pain in pregnancy than disk bulge or prolapse.
authors.affiliation: Department of Diagnostic Radiology and Organ Imaging, The Chinese University of Hong Kong, Prince of Wales Hospital, Ngan Shing Street, Shatin, Hong Kong. yl190chan@cuhk.edu.hk
authors.forename: Y L
authors.initials: YL
authors.lastname: Chan
authors.forename: W W M
authors.initials: WW
authors.lastname: Lam
authors.forename: T K
authors.initials: TK
authors.lastname: Lau
authors.forename: C
authors.initials: C
authors.lastname: Metreweli
authors.forename: D P N
authors.initials: DP
authors.lastname: Chan
mesh_terms: D000328:Adult; D001416:Back Pain / Q000175:diagnosis* / Q000209:etiology; D005260:Female; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000175:diagnosis* / Q000209:etiology; D008279:Magnetic Resonance Imaging / Q000379:methods; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis*; D011263:Pregnancy Trimester, Third