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Effect of pelvic inclination and torsional deformity on canine acetabular morphology with computed tomography

Journal: Veterinary and Comparative Orthopaedics and Traumatology (VCOT)
ISSN: 0932-0814
DOI: http://dx.doi.org/10.3415/VCOT-12-10-0125
Issue: 2013: Issue 6 2013
Pages: 440-444

Effect of pelvic inclination and torsional deformity on canine acetabular morphology with computed tomography

A phantom study

A. Volta (1), A. Palumbo Piccionello (2), A. Salvaggio (2), F. Dini (2), M. Bonazzi (3), S. Manfredi (1), A. M. Tambella (2), G. Gnudi (1)

(1) Dipartimento di Scienze Medico-Veterinarie, Università degli Studi di Parma, Parma, Italy; (2) Scuola di Scienze Mediche Veterinarie, Università degli Studi di Camerino, Matelica (MC), Italy; (3) Free practitioner, Casa di Cura Veterinaria San Geminiano, Modena, Italy

Keywords

dog, computed tomography, Acetabulum

Summary

Objectives: To evaluate how the inclination and torsional deformity of the hemipelvis using extra-rotation as a model affect acetabular angle (AA) and dorsal acetabular rim angle (DARA) assessment with computed tomography (CT). Methods: A normal canine hemipelvis positioned in dorsal recumbency was scanned with a 16-slice multidetector CT scanner, with different degrees of torsional deformity, using extra-rotation around the long axis (0–5–10–15°) of the hemipelvis. Each degree of extra-rotation was acquired at 0°, +20° and –20° of gantry tilt, to mimic different pelvic inclinations on its transverse axis. Cranial and central individual acetabular angles (IAA) and central DARA were calculated and correlated with inclination and torsional deformity. Results: A very strong negative correlation was found between cranial and central IAA, pelvic inclination, and torsional deformity. A very strong positive correlation was found between DARA, pelvic inclination, and torsional deformity. Clinical significance: Pelvic inclination and torsional deformity affect acetabular angles assessment with CT. The greater the inclination (ilia far from the tabletop in dorsal recumbency) and torsional deformity of the pelvis, the worse the acetabulum appeared. A standardized scanning protocol for acetabular morphology assessment is needed and it should consider pelvic inclination. The actual relevance of pelvic torsional deformity is not well known and it should be investigated more thoroughly.

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