Stryker Announces Newly Designed ReUnion® S Humeral Stem


The ReUnion S stem is designed to be the ideal length humeral stem, optimizing bone preservation, alignment and stability as part of the ReUnion Shoulder Arthroplasty System

Stryker's Trauma and Extremities Division announces the release of the newly designed ReUnion S Humeral Stem. This latest technology focuses on bone preservation, alignment and stability, which is designed to be the ideal length for use with the ReUnion Shoulder Arthroplasty System. These are intended for patients that may be considered for shoulder arthroplasty. Stryker will showcase its latest technologies, including the ReUnion S, at the 2019 Academy Meeting in Las Vegas, NV from March 12-16, 2019.

"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," says Joaquin Sanchez-Sotelo, MD, PhD. "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.1By 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 market-leading implants for the treatment of long and small bone fractures, as well as extremity joint replacements.

About Stryker
Stryker is one of the world's leading medical technology companies and, together with its customers, is driven to make healthcare better. The company offers innovative products and services in Orthopaedics, Medical and Surgical, and Neurotechnology and Spine that help improve patient and hospital outcomes.  More information is available at

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1 Internal document: A0042705
2 Internal document: A0042660