The quest for optimal femoral torsion angle measurements: a comparative advanced 3D study defining the femoral neck axis

Autor: Bert Van fraeyenhove, Jeroen C. F. Verhaegen, Jonas Grammens, Gino Mestach, Emmanuel Audenaert, Annemieke Van Haver, Peter Verdonk
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Journal of Experimental Orthopaedics, Vol 10, Iss 1, Pp n/a-n/a (2023)
Druh dokumentu: article
ISSN: 2197-1153
57640564
DOI: 10.1186/s40634-023-00679-9
Popis: Abstract Purpose There is high variability in femoral torsion, measured on two‐dimensional (2D) computed tomography (CT) scans. The aim of this study was to find a reliable three‐dimensional (3D) femoral torsion measurement method, assess the influence of CAM deformity on femoral torsion measurement, and to promote awareness for the used measurement method. Methods 3D models of 102 dry femur specimens were divided into a CAM and non‐CAM group. Femoral torsion was measured by one 2D‐CT method described by Murphy et al. (method 0) and five 3D methods. The 3D methods differed in strategies to define the femoral neck axis. Method 1 is based on an elliptical least‐square fit at the middle of the femoral neck. Methods 2 and 3 defined the centre of mass of the entire femoral neck and of the most cylindrical part, respectively. Methods 4 and 5 were based on the intersection of the femoral neck with a 25% and 40% enlarged best fit sphere of the femoral head. Results 3D methods resulted in higher femoral torsion measures than the 2D method; the mean torsion for method 0 was 8.12° ± 7.30°, compared to 9.93° ± 8.24° (p
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