United Orthopedic Corporation

1 Introduction Since 1997, the U2 Revision Hip Stem was developed to address metaphyseal bone defect during revision surgery. The versatile size options enable the orthopaedic surgeon to select a proper implant for each patient based on pre- and intraoperative assessment. The U2 Revision Hip Stem design features as following: Titanium Alloy The elastic modulus of titanium alloy is close to cortical bone, thus decreasing stress shielding effect, bone resorption, and thigh pain. Titanium Plasma Spray Extensively coated stem increases the possibility of osteointegradation throughout the stem, which provides long-term stability of implant. 180 mm Straight and 230 mm Curve Stem Options The standard 180 mm length enables diaphyseal fixation to meet most patient need. The curved 230 mm stem addresses more bony deficiency and anatomically fits the canal with an anterior bowed shape to prevent cortical impingement and intraoperative shaft fracture. Distal diameters offered in 11, 12, 13, 14, 15, 16.5, and 18 mm adapts a variety of anatomies. Shortened Stem Offset Due to soft tissue scarring or contracture induced by previous surgeries, U2 revision stem is designed with a short offset than primary implant to facilitate joint reduction. Proximal Tri-Wedge Geometry The three-dimensional tapered profile of U2 revision stem provides rotational and axial stability and benefits load distribution. Polished and teardrop tip The teardrop tip avoids distal cortical impingement and related thigh pain.