Stryker’s Mobile Bearing Hip™
An innovation in hip replacement design, Stryker’s Mobile Bearing Hip™ replacement has a unique polyethylene insert (called anatomic dual mobility or ADM) made with X3® Advanced Bearing Technology. It fits snugly within the metal shell and over the ball to secure and buffer the joint.
Anatomic Dual Mobility
Typical fixed hip replacement components include a stem that inserts into the femur, a ball that replaces the head of the femur or top of the thigh bone, and a shell that lines the hip socket (acetabulum). The ADM allows both hip components to glide smoothly without the stem making contact with the shell. So your doctor can closely match the implant to your anatomy, giving you the following potential advantages:
Greater range of motion
The Mobile Bearing Hip™ Replacement is built for more natural movement. Test results demonstrated approximately 145º range of motion in a front-to-back sweep of the leg — a full 5% gain in range of motion when compared with fixed-bearing implants of equivalent size.1 It also let you walk more naturally, so you can maintain your active lifestyle with fewer compromises.
More comfortable and stable fit
Comfort and stability help you regain your activity level. The Mobile Bearing Hip™ Replacement is designed to help to minimize the potential risks of hip dislocation and irritation of the muscles and tendons that support your hip.2, 3
The specially designed cup is also less likely to impinge on the tendon that runs from the groin toward the front of the pelvic bone (iliopsoas tendon).3 This avoids hip stiffness, groin pain or a clicking sensation in the hip – signs that the pelvis catches the tendon when the hip flexes.
Less wear and potential for a longer life
Stryker’s Mobile Bearing Hip™ with X3® offers better wear protection in two ways: dual mobility and the X3® technology bearing surface.4 Test results prove that X3® has shown a 97% decrease in wear compared to conventional polyethylene in laboratory testing.4 Less wear may mean a longer life for your hip replacement.4
1. Stryker Test Report: RD-06-078.
2. Stryker Test Report: RD-09-068.
3. Tracol P, Vandenbussche E, Deloge N, et al. (2007). Navigation Acetabular Anatomic Study Application in the Development of a New Implant. EFORT Poster.
4. Stryker® Orthopaedics Trident® Acetabular Inserts made of X3® UHMWPE (unsterilized), 721-00-32E, show a 97% reduction in volumetric wear rate versus the same insert fabricated from N2\Vac™ gamma sterilized UHMWPE, 620-00-32E. The insert tested was 7.5mm thick with an inner diameter of 32mm. Testing was conducted under multi-axial hip joint simulation for 5 million cycles using a 32mm CoCr articulating counterface and calf serum lubricant. X3®; UHMWPE Trident®; Acetabular Inserts showed a net weight gain due to fluid absorption phenomena but yielded a positive slope and wear rate in linear regression analysis. Volumetric wear rates were 46.39 ± 11.42mm3/106 cycles for N2\Vac™ gamma sterilized UHMWPE inserts and 1.35 ± 0.68mm3/106 cycles for X3®; UHMWPE (unsterilized) Trident® Acetabular Inserts. Although in-vitro hip wear simulation methods have not been shown to quantitatively predict clinical wear performance, the current model has been able to reproduce correct wear resistance rankings for some materials with documented clinical results.a, b, c.
a. Wang, A., et al., Tribology International, Vol. 31, No. 1-3:17-33, 1998.
b. Essner, A., et al., 44th Annual Meeting, ORS, New Orleans, Mar. 16-19, 1998:774.
c. Essner, A., et al., 47th Annual Meeting, ORS, San Francisco, Feb. 25-28, 2001:1007.