T. Virén, M. Timonen, H. Tyrväinen, V. Tiitu, J.S. Jurvelin, J. Töyräs

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T. Virén, M. Timonen, H. Tyrväinen, V. Tiitu, J.S. Jurvelin, J. Töyräs

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Presentation transcript:

Ultrasonic evaluation of acute impact injury of articular cartilage in vitro T. Virén, M. Timonen, H. Tyrväinen, V. Tiitu, J.S. Jurvelin, J. Töyräs Osteoarthritis and Cartilage Volume 20, Issue 7, Pages 719-726 (July 2012) DOI: 10.1016/j.joca.2012.03.018 Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 Intact osteochondral samples were imaged with ultrasound and a light microscope. Subsequently, an impact injury was created on cartilage samples with a custom made dropping tower. The weight of 500 g was dropped on the cartilage samples from heights of 2.5 cm, 5.0 cm, 10 cm and 15 cm. In order to prevent any major creep deformation of the cartilage the weight was lifted from the sample within 1 s. After the injury, samples were imaged again with ultrasound and a light microscope. Osteoarthritis and Cartilage 2012 20, 719-726DOI: (10.1016/j.joca.2012.03.018) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 The measurement geometry. An ultrasound catheter was fixed to the high-resolution drivers to enable accurate positioning of the transducer. Cartilage sample was fixed on the goniometers, enabling accurate control of the angle between the ultrasound transducer and cartilage surface. Cartilage samples were immersed in degassed PBS during the measurements. Osteoarthritis and Cartilage 2012 20, 719-726DOI: (10.1016/j.joca.2012.03.018) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 R, IRC, AIB and URI determined for intact and injured samples (mean and 95% confidence intervals, n = 8 in all groups). Ultrasound reflection decreased after mechanical injury. Furthermore, values of AIB decreased after injury in 0.25 J and 0.74 J groups. No differences were detected on the values of URI between intact and injured tissue. *P < 0.05, Wilcoxon signed rank test. Osteoarthritis and Cartilage 2012 20, 719-726DOI: (10.1016/j.joca.2012.03.018) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 4 Optical density profiles of Safranin O stained sections of intact and injured cartilage samples (mean and 95% confidence intervals, n = 8) as a function of relative depth from the cartilage surface (surface to subchondral bone). The profiles indicate spatial distribution of proteoglycans inside the cartilage. The proteoglycan concentration was slightly lower in the injured cartilage than in intact tissue. However, the difference between the intact and injured cartilage was statistically significant only in the superficial tissue. *P < 0.05, Wilcoxon signed rank test. Osteoarthritis and Cartilage 2012 20, 719-726DOI: (10.1016/j.joca.2012.03.018) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 5 Axial orientation of the collagen fibrils relative to the cartilage surface (mean and 95% confidence intervals, n = 8) as a function of the relative depth from the cartilage surface (surface to subchondral bone). The orientation of the collagen fibrils was similar in intact and injured cartilage. Osteoarthritis and Cartilage 2012 20, 719-726DOI: (10.1016/j.joca.2012.03.018) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 6 A representative ultrasound, light microscopic and histological images (Safranin O staining of proteoglycans and PLM image of collagen orientation) of intact and injured cartilage. The cartilage injury created by impact energy of 0.12 J was not visible to the naked eye but the injury could be detected by the slight decrease of proteoglycan content in superficial cartilage and the lower ultrasound reflection at the cartilage surface. Cartilage injured by dropping an impactor on a cartilage at the instant energies of 0.25, 0.50 and 0.74 J exhibited cracking of the cartilage surface and loss of proteoglycans at the superficial cartilage. The irregular surface of the injured sample could also be detected in the ultrasound images. Osteoarthritis and Cartilage 2012 20, 719-726DOI: (10.1016/j.joca.2012.03.018) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions