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Contact models of repaired articular surfaces: influence of loading conditions and the superficial tangential zone

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Abstract

The superficial tangential zone (STZ) plays a significant role in normal articular cartilage’s ability to support loads and retain fluids. To date, tissue engineering efforts have not replicated normal STZ function in cartilage repairs. This finite element study examined the STZ’s role in normal and repaired articular surfaces under different contact conditions. Contact area and pressure distributions were allowed to change with time, tension-compression nonlinearity modeled collagen behavior in the STZ, and nonlinear geometry was incorporated to accommodate finite deformation. Responses to loading via impermeable and permeable rigid surfaces were compared to loading via normal cartilage, a more physiologic condition, anticipating the two rigid loading surfaces would bracket that of normal. For models loaded by normal cartilage, an STZ placed over the inferior repair region reduced the short-term axial compression of the articular surface by 15%, when compared to a repair without an STZ. Covering the repair with a normal STZ shifted the flow patterns and strain levels back toward that of normal cartilage. Additionally, reductions in von Mises stress (21%) and an increase in fluid pressure (13%) occurred in repair tissue under the STZ. This continues to show that STZ properties of sufficient quality are likely critical for the survival of transplanted constructs in vivo. However, response to loading via normal cartilage did not always fall within ranges predicted by the rigid surfaces. Use of more physiologic contact models is recommended for more accurate investigations into properties critical to the success of repair tissues.

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  1. Orthopaedic Research Laboratory, Departments of Orthopaedic Surgery and Biomedical Engineering, Virginia Commonwealth University, P.O. Box 843067, Richmond, VA, 23284-3067, USA

    John R. Owen & Jennifer S. Wayne

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  1. John R. Owen
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  2. Jennifer S. Wayne
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Correspondence to Jennifer S. Wayne.

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Owen, J.R., Wayne, J.S. Contact models of repaired articular surfaces: influence of loading conditions and the superficial tangential zone. Biomech Model Mechanobiol 10, 461–471 (2011). https://doi.org/10.1007/s10237-010-0247-1

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