CT Scan Method Accurately Assesses Humeral Head Retroversion |
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Authors: | P. Boileau MD R. T. Bicknell MD MSc FRCSC N. Mazzoleni MD G. Walch MD J. P. Urien MD |
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Affiliation: | 1.Department of Orthopaedic Surgery and Sports Traumatology, Hôpital de L’Archet, University of Nice, Nice, France ;2.Department of Orthopaedic Surgery, Clinique Sainte Anne Lumière, Lyon, France ;3.Division of Orthopaedic Surgery, Department of Surgery, Kingston General Hospital, Queen’s University, Nickle 3, 76 Stuart Street, Kingston, Ontario Canada K7L 2V7 |
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Abstract: | Humeral head retroversion is not well described with the literature controversial regarding accuracy of measurement methods and ranges of normal values. We therefore determined normal humeral head retroversion and assessed the measurement methods. We measured retroversion in 65 cadaveric humeri, including 52 paired specimens, using four methods: radiographic, computed tomography (CT) scan, computer-assisted, and direct methods. We also assessed the distance between the humeral head central axis and the bicipital groove. CT scan methods accurately measure humeral head retroversion, while radiographic methods do not. The retroversion with respect to the transepicondylar axis was 17.9° and 21.5° with respect to the trochlear tangent axis. The difference between the right and left humeri was 8.9°. The distance between the central axis of the humeral head and the bicipital groove was 7.0 mm and was consistent between right and left humeri. Humeral head retroversion may be most accurately obtained using the patient’s own anatomic landmarks or, if not, identifiable retroversion as measured by those landmarks on contralateral side or the bicipital groove. Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article. |
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