I. Haider, A. Speirs, A. Alnabelseya, P.E. Beaulé, H. Frei

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Presentation transcript:

Femoral subchondral bone properties of patients with cam-type femoroacetabular impingement I. Haider, A. Speirs, A. Alnabelseya, P.E. Beaulé, H. Frei Osteoarthritis and Cartilage Volume 24, Issue 6, Pages 1000-1006 (June 2016) DOI: 10.1016/j.joca.2016.01.003 Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 The hatched area indicates the harvest locations of the osteochondral specimens. Specimens (diameter 10 mm, height approx. 3 mm) were obtained (a) from the cam deformity of symptomatic FAI patient and (b) from the antero-superior femoral head near the head and neck junction from normal cadaveric donors. Osteoarthritis and Cartilage 2016 24, 1000-1006DOI: (10.1016/j.joca.2016.01.003) Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Single slice (a) and 3D representation (b) of the VOI used to determine the trabecular architecture. The dashed line in (a) represents the bounding box for one particular section, which was reduced by 5% on each side to account for some irregularities in the shape of the beam specimens. Figure (b) shows a 3D representation of the VOI in light gray. The dark gray in (a) and (b) indicates the bone that was omitted form the analysis. Osteoarthritis and Cartilage 2016 24, 1000-1006DOI: (10.1016/j.joca.2016.01.003) Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 Three-point bending test setup. The displacement of the beam specimens was measured on the tensile side of the beam at mid-span with a custom low stiffness CDMD to minimize the effect of local bone crushing. Osteoarthritis and Cartilage 2016 24, 1000-1006DOI: (10.1016/j.joca.2016.01.003) Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions

Fig. 4 Finite element mesh of a typical specimen showing the applied boundary conditions. Locations A and B, corresponding to the cylinders supporting the specimen, were constrained in the vertical direction but free rotate and translate in the horizontal plane. Location C, where the vertical displacement was applied, was constrained in the horizontal plane and free to rotate. Osteoarthritis and Cartilage 2016 24, 1000-1006DOI: (10.1016/j.joca.2016.01.003) Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions

Fig. 5 Surface models of cam-type deformity specimen showing the variation (lowest, average and highest) in BV/TV. Osteoarthritis and Cartilage 2016 24, 1000-1006DOI: (10.1016/j.joca.2016.01.003) Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions

Fig. 6 Trabecular architecture parameters of normal controls and cam-type deformity specimens. There was no significant difference between any of these parameters. (error bars: SD). Osteoarthritis and Cartilage 2016 24, 1000-1006DOI: (10.1016/j.joca.2016.01.003) Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions