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The Acetabular Fossa May Not Be Located at the True Center of the Acetabulum
- Source :
- Journal of Bone and Joint Surgery. 100:e27
- Publication Year :
- 2018
- Publisher :
- Ovid Technologies (Wolters Kluwer Health), 2018.
-
Abstract
- Background The acetabular fossa is thought to be located in the center of the acetabulum, and acetabular reaming in total hip arthroplasty is conventionally performed in the center of the fossa. However, the actual location of the fossa and the influence that hypoplasia or deformity may have on the position of the fossa are unknown. We hypothesized that the fossa is located in the center of the acetabulum, regardless of hypoplasia or deformity. Methods Fifty patients with normal hips (normal hip group), 50 patients with dysplasia who underwent rotational acetabular osteotomy (dysplastic hip group), and 46 patients with osteoarthritis who underwent total hip arthroplasty (osteoarthritic hip group) were evaluated by computed tomography (CT) imaging. On the horizontal plane that passes through the center of the femoral head, the center line of the acetabulum was defined as the perpendicular bisector of the anterior and posterior rims of the acetabulum. The angle and distance of the center of the acetabular fossa in relation to the center line of the acetabulum were evaluated; furthermore, the center position of the fossa from the anterior margin of the acetabulum was calculated as a ratio relative to acetabular size. A 1-way analysis of variance was performed to compare measurements among the 3 groups. Results The center of the acetabular fossa was positioned anteriorly to the center line of the acetabulum in all 3 groups. The mean center angle of the acetabular fossa was 14.0° ± 3.8°, 15.2° ± 5.6°, and 14.9° ± 5.5° in the normal, dysplastic, and osteoarthritic hip groups, respectively (p = 0.33). The mean center distance of the acetabular fossa was 5.6 ± 1.8, 5.8 ± 2.3, and 6.1 ± 2.2 mm, respectively (p = 0.55). The mean center position of the acetabular fossa was 38.8% ± 3.3%, 38.5% ± 4.2%, and 38.3% ± 3.9%, respectively (p = 0.71). Conclusions The center of the acetabular fossa is positioned anteriorly to the center of the acetabulum, and the positioning is affected by neither dysplasia nor osteoarthritis. The preconception that the center of the acetabulum corresponds to the center of the acetabular fossa may risk eccentric reaming, possibly damaging the anterior wall. Level of evidence Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.
- Subjects :
- Adult
Male
musculoskeletal diseases
Adolescent
Fossa
Arthroplasty, Replacement, Hip
medicine.medical_treatment
Osteotomy
Osteoarthritis, Hip
030218 nuclear medicine & medical imaging
Young Adult
03 medical and health sciences
Femoral head
0302 clinical medicine
medicine
Deformity
Humans
Orthopedics and Sports Medicine
Hip Dislocation, Congenital
Aged
Retrospective Studies
Aged, 80 and over
Hip surgery
030222 orthopedics
biology
business.industry
Acetabulum
General Medicine
Middle Aged
biology.organism_classification
Arthroplasty
medicine.anatomical_structure
Female
Hip Joint
Surgery
medicine.symptom
Tomography, X-Ray Computed
Acetabular fossa
Nuclear medicine
business
Subjects
Details
- ISSN :
- 15351386 and 00219355
- Volume :
- 100
- Database :
- OpenAIRE
- Journal :
- Journal of Bone and Joint Surgery
- Accession number :
- edsair.doi.dedup.....556e24fe9dbb1d160138a7a110b6d71a