Stryker is showcasing its latest technologies, including the ReUnion S, this week at the 2019 American Academy of Orthopaedic Surgeons Annual Meeting in Las Vegas, Nev.
"Certain humeral short stems implanted to date have been associated with unacceptable high rates of malalignment, loosening, stress shielding and other modalities of adverse bone reactions," said Joaquin Sanchez-Sotelo, M.D., Ph.D. "This is driven by excessive shortening, increased proximal bulk, and poor implant alignment. By utilizing the Stryker Orthopaedics Modeling and Analytics (SOMA) database and software, study findings have allowed us to develop a more anatomically relevant length stem."
These findings and the new stem have led to:
- Bone preservation: ReUnion S preserves more bone mass proximally and distally compared to competitive stems.1 By keeping the wedge shape proximal body, soft-tissue management preference is that of the user, not limited by the stem design. Reduced stem length was determined through our SOMA analysis; identifying a humeral transition point and alignment length.2
- Alignment: By extensively studying the cross-sectional geometry of the humeral canal with SOMA, a unique transition point was identified where the flare of the metaphysis tapers to the more regular, cylindrical shape in the diaphyseal region. With the transition point identified, our target alignment zone was identified to avoid varus/ valgus placement of the stem.2
- Stability: The enhanced medial sweep of the stem avoids distal engagement while the alignment focused length and incremental distal sizing options prevent canal migration. The S stem is designed to retain the alignment and stability benefits of a longer humeral stem prosthesis.2
Stryker's Trauma and Extremities portfolio offers implants for the treatment of long and small bone fractures, as well as extremity joint replacements.
Stryker is one of the world's leading medical technology companies, offering products and services in Orthopedics, Medical and Surgical, and Neurotechnology and Spine that help improve patient and hospital outcomes.
1 Internal document: A0042705
2 Internal document: A0042660