title: Does Labral Size Correlate With Degree of Acetabular Dysplasia?
abstract: BACKGROUND
  Hip dysplasia has been shown to be a cause of early arthritis. The decrease in bony coverage has shown increased stress on the acetabular labrum as it shares an increased load.
  
  
  OBJECTIVE
  The purpose of this study was to divide a cohort of patients by radiographic measures of dysplastic and nondysplastic hips for comparison with regard to labral size at 4 anatomic locations. The hypothesis was that dysplastic hips will have significantly larger labral size compared with nondysplastic hips.
  
  
  METHODS
  Cross-sectional study; Level of evidence, 3.
  
  
  METHODS
  A prospective study was conducted at a single institution. A total of 130 patients underwent hip arthroscopy during the study period from September 2011 to February 2012. Intraoperatively, arthroscopic measurements were taken at 4 quadrants on the acetabular clockface: anterosuperior (12-3 o'clock), anteroinferior (3-6 o'clock), posterosuperior (9-12 o'clock), and posteroinferior (6-9 o'clock). Three radiographic parameters for dysplasia were used to substratify the study population base: lateral center-edge angle (LCEA) ≤25° and LCEA >25°, acetabular inclination (AI) ≤10° and AI >10°, and anterior center-edge angle (ACEA) ≤20° and ACEA >20°.
  
  
  RESULTS
  For the LCEA ≤25° group, there were 28 hips with mean LCEA of 20.96° ± 3.40°. Patients with LCEA ≤25° had larger labral width in all 4 quadrants (P < .05). For AI >10°, there were 12 hips with the mean AI 12.92° ± 2.50°. Patients with AI >10° had larger labral size in the posteroinferior quadrant only (P < .05). For ACEA ≤20°, there were 4 hips with a mean ACEA of 11.25° ± 5.19°. The anteroinferior and posteroinferior quadrants had a significant increase in labral size when substratified by ACEA ≤20° (P < .05).
  
  
  CONCLUSIONS
  Labral size was significantly larger in dysplastic hips compared with nondysplastic hips. The posteroinferior quadrant labrum was larger in size in dysplastic hips, as measured by any of the 3 radiographic measurements of dysplasia. Hips with LCEA ≤25° had larger labra in all 4 quadrants.
authors.affiliation: American Hip Institute, Westmont, Illinois, USA.
authors.forename: Asheesh
authors.initials: A
authors.lastname: Gupta
authors.affiliation: American Hip Institute, Westmont, Illinois, USA.
authors.forename: Sivashankar
authors.initials: S
authors.lastname: Chandrasekaran
authors.affiliation: American Hip Institute, Westmont, Illinois, USA.
authors.forename: John M
authors.initials: JM
authors.lastname: Redmond
authors.affiliation: American Hip Institute, Westmont, Illinois, USA.
authors.forename: Jon E
authors.initials: JE
authors.lastname: Hammarstedt
authors.affiliation: American Hip Institute, Westmont, Illinois, USA.
authors.forename: T Luke
authors.initials: TL
authors.lastname: Cramer
authors.affiliation: University of Chicago Pritzker School of Medicine, Chicago, Illinois, USA.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: American Hip Institute, Westmont, Illinois, USA. ; Hinsdale Orthopaedics, Hinsdale, Illinois, USA. ; Loyola University Chicago Stritch School of Medicine, Chicago, Illinois, USA.
authors.forename: Benjamin G
authors.initials: BG
authors.lastname: Domb
keywords: hip arthroscopy; hip dysplasia; hip imaging; hip labrum