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Pressure distribution of the native ovine knee meniscus was compared to a medial meniscectomy and three treatment conditions including a suture reattachment of the native tissue, an allograft, and a novel thermoplastic elastomer hydrogel (TPE) construct. The objective of this study was to assess the efficacy of a novel TPE hydrogel construct at restoring joint pressure and distribution. Limbs were loaded in uniaxial compression at 45°, 60°, and 75° flexion and from 0 to 181 kg. The medial meniscectomy decreased contact area by approximately 50% and doubled the mean and maximum pressure reading for the medial hemijoint. No treatment condition tested within this study was able to fully restore medial joint contact area and pressures to the native condition. A decrease in lateral contact area and increase in pressures with the meniscectomy was also seen; and to some degree, all reattachment and replacement conditions including the novel TPE hydrogel replacement helped to restore lateral pressures. Although the TPE construct did not perform as well as hoped in the medial compartment, it performed as well as, if not better, than the other reattachment and replacement options in the lateral. Further work is necessary to determine the best anchoring and attachment methods.

A Hydrogel Meniscal Replacement: Knee Joint Pressure and Distribution in an Ovine Model Compared to Native Tissue