Abstract
Background
Tissue excision in the setting of a meniscal tear has been shown to dramatically increase peak contact stresses in the affected tibiofemoral joint compartment, leading to the development of degenerative changes and osteoarthritis.
Purpose/hypothesis
The current in vitro study utilized a porcine model to evaluate the effectiveness of segmental medial meniscal grafting following partial meniscectomy. The study hypothesis was that the procedure would normalize medial tibofemoral joint compartment pressure magnitudes, areas, and locations relative to an intact meniscus.
Study design
Controlled laboratory study.
Methods
Using pressure film, medial tibiofemoral joint compartment peak, and mean pressure magnitudes, peak pressure location and peak pressure area were determined using 12 potted, fresh frozen, porcine knee specimens. Data were collected at three different knee flexion angles (90°, 45°, and 0°) for three conditions: intact medial meniscus, following resection of the central third of the medial meniscus, and following segmental medial meniscal grafting. For each condition, the potted femur was positioned horizontally in a bench vise clamp, while a 20 pound (88.96 N) axial compression force was manually applied for a 60 s duration by the primary investigator through the base of the potted tibia using a digital force gauge.
Results
Loss of the central 1/3 of the medial meniscus resulted in significant increases in the mean and peak pressures of the medial tibiofemoral joint compartment and decreased peak pressure area. Segmental meniscal grafting of the central third defect closely recreated the contact pressures and loading areas of the native, intact medial meniscus.
Conclusion
From a static, time zero biomechanical perspective, segmental medial meniscus grafting of a partially meniscectomized knee restored mean pressure, peak pressure, and mean peak contact pressure areas of the medial tibiofemoral joint compartment back to levels observed in the intact medial meniscus at different knee flexion angles. In-vivo analysis under dynamic conditions is necessary to verify the healing efficacy and ability of the healed segmental medial meniscal allograft to provide long-term knee joint homeostasis when confronted with dynamic shear, rotatory, and combined, higher magnitude physiologic loading forces.
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Acknowledgements
This study was sponsored by the Joint Restoration Foundation™, 6278 South Troy Circle, Centennial, CO 80111. Thanks to David Wilke for his assistance.
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The authors declare that they have no conflict of interest. Dr. DC and Dr. ES are consultants for the Joint Restoration Foundation.
Funding
This study was funded by a grant from the Joint Restoration Foundation, Centennial, Colorado, USA.
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This article does not contain any human participants. In vitro porcine specimens used for study purposes were obtained from a local abattoir.
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Nyland, J., Campbell, K., Kalloub, A. et al. Medial meniscus grafting restores normal tibiofemoral contact pressures. Arch Orthop Trauma Surg 138, 361–367 (2018). https://doi.org/10.1007/s00402-017-2849-x
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DOI: https://doi.org/10.1007/s00402-017-2849-x