Penn Scaffold Mimics Enthesis Zones to Boost Rotator Cuff Healing in Preclinical Models

The device uses tendon-derived nanofibers plus hyaluronic acid for the soft-tissue zones and a citrate-based porous matrix for the bone region. In vitro, regional stiffness and chemistry directed mesenchymal stem cells into lineage-specific matrices; in rat rotator-cuff models, the scaffold produced more histologically graded entheses and higher load-to-failure values than suture-only repairs. Large tears and age-related degeneration remain common failure points because conventional anchors ignore the native four-zone transition that transmits force and signals cells. Because the scaffold snaps onto existing anchor systems, surgeons could adopt it without new instrumentation once large-animal data are obtained. Next steps require ovine or canine studies that measure retear rates at 6 and 12 months under physiologic loading, followed by GMP manufacturing and an FDA 510(k) or de novo pathway.