title: Postpartum sacral stress fracture: a case report.
abstract: BACKGROUND
  Stress fractures are classified as insufficiency and fatigue fractures. Insufficiency fractures occur when normal stresses are placed on bone with decreased mineralization and elastic resistance; whereas fatigue fractures occur when abnormal forces are applied to normal bone.
  
  
  METHODS
  We report a case of postpartum bilateral sacral fracture in the absence of documented osteoporosis in a 30 year old Lebanese female, thus satisfying the classification of fatigue fractures. Clinical presentation was mainly low back pain, pelvic pain, and abnormal gait.
  
  
  CONCLUSIONS
  This case stresses the importance of including sacral fractures in the differential diagnosis of patients presenting with similar symptoms during pregnancy or the postpartum period.
authors.affiliation: Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon.|Ain Wazein Hospital, Ain Wazein, Lebanon.
authors.forename: Nadeen
authors.initials: N
authors.lastname: Hilal
authors.affiliation: Department of Obstetrics and Gynecology, American University of Beirut Medical Center, PO Box: 11-0236, Riad El Solh, Beirut, 1107 2020, Beirut, Lebanon. an21@aub.edu.lb.
authors.forename: Anwar H
authors.initials: AH
authors.lastname: Nassar
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D015775:Fractures, Stress / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D017116:Low Back Pain / Q000209:etiology; D049590:Postpartum Period; D011247:Pregnancy; D012447:Sacrum / Q000293:injuries*
keywords: Back pain; Postpartum; Pregnancy; Sacrum; Stress fracture