title: Gender and racial differences in focal and global acetabular version.
abstract: The purpose of this study was to compare the acetabular version between male and female pelvises. We hypothesized that female acetabula would demonstrate more retroversion because Pincer-type femoroacetabular impingement (FAI) is associated with acetabular retroversion, which is more commonly observed in females. 120 bony pelvic specimens were randomly collected. The version was measured at three different axial sections of each acetabulum: cranial, central, and caudal. Males demonstrated significantly less anteversion than females in every section. The global version (the average of all three measurements) was also significantly different between males and females (16° ± 7° and 19° ± 8° respectively, P<0.001). Of the 240 examined acetabuli, 21 demonstrated cranial retroversion (16 males & 5 females). The data showed no significant difference (P=0.353) between global version of African Americans (18° ± 9°) and Caucasians (17° ± 7°). The results of this study suggest that symptomatic FAI in the female population likely reflects a complex interplay of femoral and acetabular dysmorphology and cannot be explained by differences in acetabular version alone.
authors.affiliation: Department of Orthopaedic Surgery, MedSport, University of Michigan Medical School, Ann Arbor, Michigan.
authors.forename: Eric
authors.initials: E
authors.lastname: Tannenbaum
authors.affiliation: University of Michigan Medical School, Ann Arbor, Michigan.
authors.forename: Nathan
authors.initials: N
authors.lastname: Kopydlowski
authors.affiliation: Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, Missouri.
authors.forename: Matthew
authors.initials: M
authors.lastname: Smith
authors.affiliation: Department of Orthopaedic Surgery, MedSport, University of Michigan Medical School, Ann Arbor, Michigan.
authors.forename: Asheesh
authors.initials: A
authors.lastname: Bedi
authors.affiliation: Department of Orthopaedic Surgery, MedSport, University of Michigan Medical School, Ann Arbor, Michigan.
authors.forename: Jon K
authors.initials: JK
authors.lastname: Sekiya
mesh_terms: D000077:Acetabulum / Q000033:anatomy & histology*; D000293:Adolescent; D000328:Adult; D001837:Body Weights and Measures; D017760:Bone Malalignment / Q000150:complications / Q000453:epidemiology* / Q000208:ethnology / Q000266:history; D005260:Female; D057925:Femoracetabular Impingement / Q000453:epidemiology* / Q000208:ethnology / Q000209:etiology / Q000266:history; D005269:Femur / Q000033:anatomy & histology*; D049673:History, 20th Century; D006801:Humans; D008297:Male; D008875:Middle Aged; D010384:Pelvic Bones / Q000033:anatomy & histology; D044469:Racial Groups; D011897:Random Allocation; D012737:Sex Factors; D055815:Young Adult
keywords: acetabular retroversion; femoroacetabular impingement; hip impingement; hip pain; pincer impingement