Split-Line Orientation of the Talar Dome Articular Cartilage

Purpose: The purpose of this study was to define the pattern of superficial collagen fibril orientation on the talar dome and to create a template for rotational graft alignment during mosaicplasty. Type of Study: An anatomic, cadaveric study. Methods: Eight fresh-frozen human cadaveric tali had the articular surface of the talar dome pierced in grid fashion with a dissecting needle dipped in India ink. The longitudinal split that occurred between the superficial collagen fibers defined the fiber arrangement at each site of the talar dome. Results: There was a remarkably consistent pattern to the split lines from specimen to specimen. Conclusion: Proper orientation of mosaicplasty plugs during transfer from the donor to recipient site with respect to superficial collagen fiber arrangement may allow the graft to better resist tensile stresses and may contribute to increased long-term graft longevity. Clinical Relevance: Use of the talar dome map, combined with knowledge of the split-line orientation of the donor site, should allow surgeons performing mosaicplasty procedures on the talus to properly rotate their plugs with respect to split-line orientation.