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Ninety-eight per cent nucleus replacement (REPL-98FE) versus intact disc model (INTACTFE). Temporal changes of the (a) height loss and (b) intradiscal pressure in the centre of the nucleus as well as the total axial forces transmitted through the (c) nucleus and (d) annulus (ground substance and collagen fibres). The fluid flows freely out of the nucleus into the gap assuming a zero boundary pore pressure at the outer nucleus surface.
