An in vivo comparison of the orientation of the transverse acetabular ligament and the acetabulum.
Aligning the acetabular component with the Transverse Acetabular Ligament (TAL) to ensure optimal anteversion has been reported to reduce dislocation rates. However, to our knowledge in vivo measurement of the TAL angle has not yet been reported in a large cohort of normal hips. CT scans of 218 normal hips were analyzed. The TAL and four acetabular rim anteversion angles were measured (superiorly to inferiorly) relative to the anterior pelvic plane. The mean TAL anteversion angle was 20.5° ± 7.0°, and the acetabular rim angles from superior to inferior were 11.0° ± 12.9°, 19.9° ± 8.8°, 20.9° ± 6.2° and 25.1° ± 6.2° respectively. Both the TAL and the acetabular rim were significantly more anteverted in females than in males. The TAL anteversion angle was comparable to the predominant orientation (central rim section) of the native acetabulum while the superior acetabulum was comparatively retroverted and the inferior was relatively more anteverted.
Trauma and Orthopaedic Research Unit, The Canberra Hospital, Canberra, Australia; Department of Medicine, Australian National University, Canberra, Australia.
Andrew R
AR
Griffin
Trauma and Orthopaedic Research Unit, The Canberra Hospital, Canberra, Australia; Department of Medicine, Australian National University, Canberra, Australia.
Diana M
DM
Perriman
Trauma and Orthopaedic Research Unit, The Canberra Hospital, Canberra, Australia; Department of Medicine, Australian National University, Canberra, Australia.
Claire J
CJ
Bolton
Trauma and Orthopaedic Research Unit, The Canberra Hospital, Canberra, Australia; Department of Medicine, Australian National University, Canberra, Australia.
Paul N
PN
Smith
D000077:Acetabulum / Q000000981:diagnostic imaging* / Q000601:surgery; D060750:Bone Anteversion / Q000000981:diagnostic imaging*; D005260:Female; D006621:Hip Joint / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D006801:Humans; D008023:Ligaments, Articular / Q000000981:diagnostic imaging* / Q000601:surgery; D008297:Male; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
acetabular component alignment; native acetabulum; transverse acetabular ligament