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- Title
Does hemipelvis structure and position influence acetabulum orientation?
- Authors
Musielak, Bartosz; Jóźwiak, Marek; Rychlik, Michał; Brian Po-Jung Chen; Idzior, Maciej; Grzegorzewski, Andrzej; Chen, Brian Po-Jung
- Abstract
<bold>Background: </bold>Although acetabulum orientation is well established anatomically and radiographically, its relation to the innominate bone has rarely been addressed. If explored, it could open the discussion on patomechanisms of such complex disorders as femoroacetabular impingement (FAI). We therefore evaluated the influence of pelvic bone position and structure on acetabular spatial orientation. We describe this relation and its clinical implications.<bold>Methods: </bold>This retrospective study was based on computed tomography scanning of three-dimensional models of 31 consecutive male pelvises (62 acetabulums). All measurements were based on CT spatial reconstruction with the use of highly specialized software (Rhinoceros). Relations between acetabular orientation (inclination, tilt, anteversion angles) and pelvic structure were evaluated. The following parameters were evaluated to assess the pelvic structure: iliac opening angle, iliac tilt angle, interspinous distance (ISD), intertuberous distance (ITD), height of the pelvis (HP), and the ISD/ITD/HP ratio. The linear and nonlinear dependence of the acetabular angles and hemipelvic measurements were examined with Pearson's product - moment correlation and Spearman's rank correlation coefficient. Correlations different from 0 with p < 0.05 were considered statistically significant.<bold>Results: </bold>Comparison of the axis position with pelvis structure with orientation in the horizontal plane revealed a significant positive correlation between the acetabular anteversion angle and the iliac opening angle (p = 0.041 and 0.008, respectively). In the frontal plane, there was a positive correlation between the acetabular inclination angle and the iliac tilt angle (p = 0.025 and 0.014, respectively) and the acetabular inclination angle and the ISD/ITD/HP ratio (both p = 0.048).<bold>Conclusions: </bold>There is a significant correlation of the hemipelvic structure and acetabular orientation under anatomic conditions, especially in the frontal and horizontal planes. In the anteroposterior view, the more tilted-down innominate bone causes a more caudally oriented acetabulum axis, whereas in the horizontal view this relation is reversed. This study may serve as a basis for the discussion on the role of the pelvis in common disorders of the hip.
- Subjects
FEMORACETABULAR impingement; PELVIS; ACETABULUM (Anatomy); COMPUTED tomography; HIP joint; HUMAN body; COMPARATIVE studies; COMPUTER software; DIAGNOSTIC imaging; HUMAN anatomical models; RESEARCH methodology; MEDICAL cooperation; COMPUTERS in medicine; PELVIC bones; RESEARCH; THREE-dimensional imaging; EVALUATION research; RETROSPECTIVE studies; MULTIDETECTOR computed tomography
- Publication
BMC Musculoskeletal Disorders, 2016, Vol 17, p1
- ISSN
1471-2474
- Publication type
journal article
- DOI
10.1186/s12891-016-0982-2