CT evaluation of native acetabular orientation and localization: sex-specific data comparison on 336 hip joints.
BACKGROUND
The reorientation of the acetabular component in total hip replacement is currently carried out under consideration of the safe zone, respecting the best possible range of motion and is influenced by wear debris of different bearings. Is the preferred orientation a reconstruction of the native anatomy and are there sex-specific differences?


METHODS
On the basis of 168 CT datasets (72 women, 96 men) 336 native hip joints were analysed. The abduction and anteversion of the acetabulum as well as the location of the hip center were detected. As a reference the anterior pelvic plane was used.


RESULTS
The 144 female hip joints showed a mean abduction of 53.0 degrees (SD 6.14 degrees ) and an anteversion of 24.63 degrees (SD 6.61 degrees ). The 192 male hip joints showed an abduction of 53.58 degrees (SD 6.68 degrees ) and an anteversion of 21.31 degrees (SD 6.17 degrees ). Significant differences were observed on comparison between the sexes in relation to the anteversion and the location of the hip center. Likewise, there was a significant correlation between the position of the hip center and the degree of anteversion.


CONCLUSIONS
In total hip arthroplasty a reconstruction of the native acetabular orientation is not possible, gender specific characteristics should be considered.
Tohtz
Stephan W
SW
Center for Musculoskeletal Surgery, Charité - Universitätsmedizin Berlin, Berlin, Germany. stephan.tohtz@charite.de
Sassy
Danny
D
Matziolis
Georg
G
Preininger
Bernd
B
Perka
Carsten
C
Hasart
Olaf
O
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D005260:Female; D006621:Hip Joint / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D014057:Tomography, X-Ray Computed