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Advanced Metal Alloy Supports Dual Mobility Implants

By HospiMedica International staff writers
Posted on 19 Nov 2019
A novel dual mobility (DM) implant with a small diameter femoral head increases stability and offers improved range of motion.

The Smith & Nephew (London, United Kingdom) OR3O Dual Mobility System is a modular DM implant system intended for primary and revision total hip arthroplasty procedures in skeletally mature patients. The system consists of diffusion hardened, oxidized zirconium alloy liners with a highly polished inner surface of zirconia, and a machined locking taper and backside made of a Zr-2.5Nb alloy. The locking taper and machined outside profile mate with a dedicated Titanium or modular press-fit acetabular shell and oxidized zirconium or CoCr alloy femoral heads, available in 22 or 28mm.

Image: The OR3O Dual Mobility System (Photo courtesy of Smith & Nephew)
Image: The OR3O Dual Mobility System (Photo courtesy of Smith & Nephew)

The final OR3O Dual Mobility construct includes the acetabular shell, an OXINIUM Diffusion Hardened (DH) liner, a cross-linked polyethylene (XLPE) insert, and a femoral head. Indications for use include advanced degeneration of the hip joint as a result of degenerative, post-traumatic, or rheumatoid arthritis; all forms of osteoarthritis; fracture or avascular necrosis of the femoral head; femoral neck fracture or proximal hip joint fracture; and failure of previous hip surgeries such as internal fixation, arthrodesis, hemiarthroplasty, total hip replacement, and others.

“Our new OR3O Dual Mobility System is a groundbreaking product that offers technology not available in competitive systems,” said Skip Kiil, president of orthopedics at Smith+Nephew. “The proven success of our VERILAST Technology and OXINIUM DH bearing surface set OR3O apart as a game changing solution in the hip arthroplasty market.”

“The OR3O Dual Mobility System is truly a fourth generation dual mobility offering by introducing OXINIUM technologies,” said orthopedic surgeon Stephen Duncan, MD, of the University of Kentucky (Lexington, USA). “This is a solution that allows patients to get back to their lives by providing stability and offers unique advantages compared to other systems.”

A hip replacement implant is a ball-and-socket mechanism, designed to simulate a human hip joint and mimic its movement. Typical components include a stem that inserts into the femur, a ball that replaces the head of the thigh bone, and a shell that lines the hip socket. The concept of DM, which was originally developed in France in the 1970s, refers to the bearing surface of the implant; DM provide two areas of motion within the artificial socket, thus improving the range of movement and reducing the risk of dislocation.

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